diff --git a/test/syscalls/linux/socket_inet_loopback.cc b/test/syscalls/linux/socket_inet_loopback.cc
index d83fb1543..4195e402c 100644
--- a/test/syscalls/linux/socket_inet_loopback.cc
+++ b/test/syscalls/linux/socket_inet_loopback.cc
@@ -69,67 +69,6 @@ PosixError SetAddrPort(int family, sockaddr_storage* addr, uint16_t port) {
   }
 }
 
-struct TestAddress {
-  std::string description;
-  sockaddr_storage addr;
-  socklen_t addr_len;
-
-  int family() const { return addr.ss_family; }
-  explicit TestAddress(std::string description = "")
-      : description(std::move(description)), addr(), addr_len() {}
-};
-
-TestAddress V4Any() {
-  TestAddress t("V4Any");
-  t.addr.ss_family = AF_INET;
-  t.addr_len = sizeof(sockaddr_in);
-  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr = htonl(INADDR_ANY);
-  return t;
-}
-
-TestAddress V4Loopback() {
-  TestAddress t("V4Loopback");
-  t.addr.ss_family = AF_INET;
-  t.addr_len = sizeof(sockaddr_in);
-  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr =
-      htonl(INADDR_LOOPBACK);
-  return t;
-}
-
-TestAddress V4MappedAny() {
-  TestAddress t("V4MappedAny");
-  t.addr.ss_family = AF_INET6;
-  t.addr_len = sizeof(sockaddr_in6);
-  inet_pton(AF_INET6, "::ffff:0.0.0.0",
-            reinterpret_cast<sockaddr_in6*>(&t.addr)->sin6_addr.s6_addr);
-  return t;
-}
-
-TestAddress V4MappedLoopback() {
-  TestAddress t("V4MappedLoopback");
-  t.addr.ss_family = AF_INET6;
-  t.addr_len = sizeof(sockaddr_in6);
-  inet_pton(AF_INET6, "::ffff:127.0.0.1",
-            reinterpret_cast<sockaddr_in6*>(&t.addr)->sin6_addr.s6_addr);
-  return t;
-}
-
-TestAddress V6Any() {
-  TestAddress t("V6Any");
-  t.addr.ss_family = AF_INET6;
-  t.addr_len = sizeof(sockaddr_in6);
-  reinterpret_cast<sockaddr_in6*>(&t.addr)->sin6_addr = in6addr_any;
-  return t;
-}
-
-TestAddress V6Loopback() {
-  TestAddress t("V6Loopback");
-  t.addr.ss_family = AF_INET6;
-  t.addr_len = sizeof(sockaddr_in6);
-  reinterpret_cast<sockaddr_in6*>(&t.addr)->sin6_addr = in6addr_loopback;
-  return t;
-}
-
 struct TestParam {
   TestAddress listener;
   TestAddress connector;
diff --git a/test/syscalls/linux/socket_ipv4_udp_unbound.cc b/test/syscalls/linux/socket_ipv4_udp_unbound.cc
index 1b47139e4..4058324a2 100644
--- a/test/syscalls/linux/socket_ipv4_udp_unbound.cc
+++ b/test/syscalls/linux/socket_ipv4_udp_unbound.cc
@@ -29,6 +29,17 @@
 namespace gvisor {
 namespace testing {
 
+constexpr char kMulticastAddress[] = "224.0.2.1";
+
+TestAddress V4Multicast() {
+  TestAddress t("V4Multicast");
+  t.addr.ss_family = AF_INET;
+  t.addr_len = sizeof(sockaddr_in);
+  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr =
+      inet_addr(kMulticastAddress);
+  return t;
+}
+
 // Check that packets are not received without a group memebership. Default send
 // interface configured by bind.
 TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastLoopbackNoGroup) {
@@ -36,41 +47,37 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastLoopbackNoGroup) {
 
   // Bind the first FD to the loopback. This is an alternative to
   // IP_MULTICAST_IF for setting the default send interface.
-  sockaddr_in senderAddr = {};
-  senderAddr.sin_family = AF_INET;
-  senderAddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+  auto sender_addr = V4Loopback();
   EXPECT_THAT(
-      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&senderAddr),
-           sizeof(senderAddr)),
+      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&sender_addr.addr),
+           sender_addr.addr_len),
       SyscallSucceeds());
 
   // Bind the second FD to the v4 any address. If multicast worked like unicast,
   // this would ensure that we get the packet.
-  sockaddr_in receiverAddr = {};
-  receiverAddr.sin_family = AF_INET;
-  receiverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
-  EXPECT_THAT(
-      bind(sockets->second_fd(), reinterpret_cast<sockaddr*>(&receiverAddr),
-           sizeof(receiverAddr)),
-      SyscallSucceeds());
-  socklen_t receiverAddrLen = sizeof(receiverAddr);
-  EXPECT_THAT(
-      getsockname(sockets->second_fd(),
-                  reinterpret_cast<sockaddr*>(&receiverAddr), &receiverAddrLen),
-      SyscallSucceeds());
-  EXPECT_EQ(receiverAddrLen, sizeof(receiverAddr));
+  auto receiver_addr = V4Any();
+  EXPECT_THAT(bind(sockets->second_fd(),
+                   reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                   receiver_addr.addr_len),
+              SyscallSucceeds());
+  socklen_t receiver_addr_len = receiver_addr.addr_len;
+  EXPECT_THAT(getsockname(sockets->second_fd(),
+                          reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                          &receiver_addr_len),
+              SyscallSucceeds());
+  EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len);
 
   // Send the multicast packet.
-  sockaddr_in sendAddr = {};
-  sendAddr.sin_family = AF_INET;
-  sendAddr.sin_port = receiverAddr.sin_port;
-  sendAddr.sin_addr.s_addr = inet_addr("224.0.2.1");
+  auto send_addr = V4Multicast();
+  reinterpret_cast<sockaddr_in*>(&send_addr.addr)->sin_port =
+      reinterpret_cast<sockaddr_in*>(&receiver_addr.addr)->sin_port;
   char send_buf[200];
   RandomizeBuffer(send_buf, sizeof(send_buf));
-  EXPECT_THAT(RetryEINTR(sendto)(
-                  sockets->first_fd(), send_buf, sizeof(send_buf), 0,
-                  reinterpret_cast<sockaddr*>(&sendAddr), sizeof(sendAddr)),
-              SyscallSucceedsWithValue(sizeof(send_buf)));
+  EXPECT_THAT(
+      RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0,
+                         reinterpret_cast<sockaddr*>(&send_addr.addr),
+                         send_addr.addr_len),
+      SyscallSucceedsWithValue(sizeof(send_buf)));
 
   // Check that we did not receive the multicast packet.
   char recv_buf[sizeof(send_buf)] = {};
@@ -86,39 +93,37 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastLoopbackAddrNoDefaultSendIf) {
 
   // Bind the second FD to the v4 any address to ensure that we can receive any
   // unicast packet.
-  sockaddr_in receiverAddr = {};
-  receiverAddr.sin_family = AF_INET;
-  receiverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
-  EXPECT_THAT(
-      bind(sockets->second_fd(), reinterpret_cast<sockaddr*>(&receiverAddr),
-           sizeof(receiverAddr)),
-      SyscallSucceeds());
-  socklen_t receiverAddrLen = sizeof(receiverAddr);
-  EXPECT_THAT(
-      getsockname(sockets->second_fd(),
-                  reinterpret_cast<sockaddr*>(&receiverAddr), &receiverAddrLen),
-      SyscallSucceeds());
-  EXPECT_EQ(receiverAddrLen, sizeof(receiverAddr));
+  auto receiver_addr = V4Any();
+  EXPECT_THAT(bind(sockets->second_fd(),
+                   reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                   receiver_addr.addr_len),
+              SyscallSucceeds());
+  socklen_t receiver_addr_len = receiver_addr.addr_len;
+  EXPECT_THAT(getsockname(sockets->second_fd(),
+                          reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                          &receiver_addr_len),
+              SyscallSucceeds());
+  EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len);
 
   // Register to receive multicast packets.
   ip_mreq group = {};
-  group.imr_multiaddr.s_addr = inet_addr("224.0.2.1");
+  group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress);
   group.imr_interface.s_addr = htonl(INADDR_LOOPBACK);
   EXPECT_THAT(setsockopt(sockets->second_fd(), IPPROTO_IP, IP_ADD_MEMBERSHIP,
                          &group, sizeof(group)),
               SyscallSucceeds());
 
   // Send a multicast packet.
-  sockaddr_in sendAddr = {};
-  sendAddr.sin_family = AF_INET;
-  sendAddr.sin_port = receiverAddr.sin_port;
-  sendAddr.sin_addr.s_addr = inet_addr("224.0.2.1");
+  auto send_addr = V4Multicast();
+  reinterpret_cast<sockaddr_in*>(&send_addr.addr)->sin_port =
+      reinterpret_cast<sockaddr_in*>(&receiver_addr.addr)->sin_port;
   char send_buf[200];
   RandomizeBuffer(send_buf, sizeof(send_buf));
-  EXPECT_THAT(RetryEINTR(sendto)(
-                  sockets->first_fd(), send_buf, sizeof(send_buf), 0,
-                  reinterpret_cast<sockaddr*>(&sendAddr), sizeof(sendAddr)),
-              SyscallFailsWithErrno(ENETUNREACH));
+  EXPECT_THAT(
+      RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0,
+                         reinterpret_cast<sockaddr*>(&send_addr.addr),
+                         send_addr.addr_len),
+      SyscallFailsWithErrno(ENETUNREACH));
 }
 
 // Check that not setting a default send interface prevents multicast packets
@@ -128,39 +133,37 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastLoopbackNicNoDefaultSendIf) {
 
   // Bind the second FD to the v4 any address to ensure that we can receive any
   // unicast packet.
-  sockaddr_in receiverAddr = {};
-  receiverAddr.sin_family = AF_INET;
-  receiverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
-  EXPECT_THAT(
-      bind(sockets->second_fd(), reinterpret_cast<sockaddr*>(&receiverAddr),
-           sizeof(receiverAddr)),
-      SyscallSucceeds());
-  socklen_t receiverAddrLen = sizeof(receiverAddr);
-  EXPECT_THAT(
-      getsockname(sockets->second_fd(),
-                  reinterpret_cast<sockaddr*>(&receiverAddr), &receiverAddrLen),
-      SyscallSucceeds());
-  EXPECT_EQ(receiverAddrLen, sizeof(receiverAddr));
+  auto receiver_addr = V4Any();
+  EXPECT_THAT(bind(sockets->second_fd(),
+                   reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                   receiver_addr.addr_len),
+              SyscallSucceeds());
+  socklen_t receiver_addr_len = receiver_addr.addr_len;
+  EXPECT_THAT(getsockname(sockets->second_fd(),
+                          reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                          &receiver_addr_len),
+              SyscallSucceeds());
+  EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len);
 
   // Register to receive multicast packets.
   ip_mreqn group = {};
-  group.imr_multiaddr.s_addr = inet_addr("224.0.2.1");
+  group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress);
   group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo"));
   EXPECT_THAT(setsockopt(sockets->second_fd(), IPPROTO_IP, IP_ADD_MEMBERSHIP,
                          &group, sizeof(group)),
               SyscallSucceeds());
 
   // Send a multicast packet.
-  sockaddr_in sendAddr = {};
-  sendAddr.sin_family = AF_INET;
-  sendAddr.sin_port = receiverAddr.sin_port;
-  sendAddr.sin_addr.s_addr = inet_addr("224.0.2.1");
+  auto send_addr = V4Multicast();
+  reinterpret_cast<sockaddr_in*>(&send_addr.addr)->sin_port =
+      reinterpret_cast<sockaddr_in*>(&receiver_addr.addr)->sin_port;
   char send_buf[200];
   RandomizeBuffer(send_buf, sizeof(send_buf));
-  EXPECT_THAT(RetryEINTR(sendto)(
-                  sockets->first_fd(), send_buf, sizeof(send_buf), 0,
-                  reinterpret_cast<sockaddr*>(&sendAddr), sizeof(sendAddr)),
-              SyscallFailsWithErrno(ENETUNREACH));
+  EXPECT_THAT(
+      RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0,
+                         reinterpret_cast<sockaddr*>(&send_addr.addr),
+                         send_addr.addr_len),
+      SyscallFailsWithErrno(ENETUNREACH));
 }
 
 // Check that multicast works when the default send interface is configured by
@@ -170,49 +173,45 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastLoopbackAddr) {
 
   // Bind the first FD to the loopback. This is an alternative to
   // IP_MULTICAST_IF for setting the default send interface.
-  sockaddr_in senderAddr = {};
-  senderAddr.sin_family = AF_INET;
-  senderAddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+  auto sender_addr = V4Loopback();
   EXPECT_THAT(
-      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&senderAddr),
-           sizeof(senderAddr)),
+      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&sender_addr.addr),
+           sender_addr.addr_len),
       SyscallSucceeds());
 
   // Bind the second FD to the v4 any address to ensure that we can receive the
   // multicast packet.
-  sockaddr_in receiverAddr = {};
-  receiverAddr.sin_family = AF_INET;
-  receiverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
-  EXPECT_THAT(
-      bind(sockets->second_fd(), reinterpret_cast<sockaddr*>(&receiverAddr),
-           sizeof(receiverAddr)),
-      SyscallSucceeds());
-  socklen_t receiverAddrLen = sizeof(receiverAddr);
-  EXPECT_THAT(
-      getsockname(sockets->second_fd(),
-                  reinterpret_cast<sockaddr*>(&receiverAddr), &receiverAddrLen),
-      SyscallSucceeds());
-  EXPECT_EQ(receiverAddrLen, sizeof(receiverAddr));
+  auto receiver_addr = V4Any();
+  EXPECT_THAT(bind(sockets->second_fd(),
+                   reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                   receiver_addr.addr_len),
+              SyscallSucceeds());
+  socklen_t receiver_addr_len = receiver_addr.addr_len;
+  EXPECT_THAT(getsockname(sockets->second_fd(),
+                          reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                          &receiver_addr_len),
+              SyscallSucceeds());
+  EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len);
 
   // Register to receive multicast packets.
   ip_mreq group = {};
-  group.imr_multiaddr.s_addr = inet_addr("224.0.2.1");
+  group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress);
   group.imr_interface.s_addr = htonl(INADDR_LOOPBACK);
   EXPECT_THAT(setsockopt(sockets->second_fd(), IPPROTO_IP, IP_ADD_MEMBERSHIP,
                          &group, sizeof(group)),
               SyscallSucceeds());
 
   // Send a multicast packet.
-  sockaddr_in sendAddr = {};
-  sendAddr.sin_family = AF_INET;
-  sendAddr.sin_port = receiverAddr.sin_port;
-  sendAddr.sin_addr.s_addr = inet_addr("224.0.2.1");
+  auto send_addr = V4Multicast();
+  reinterpret_cast<sockaddr_in*>(&send_addr.addr)->sin_port =
+      reinterpret_cast<sockaddr_in*>(&receiver_addr.addr)->sin_port;
   char send_buf[200];
   RandomizeBuffer(send_buf, sizeof(send_buf));
-  EXPECT_THAT(RetryEINTR(sendto)(
-                  sockets->first_fd(), send_buf, sizeof(send_buf), 0,
-                  reinterpret_cast<sockaddr*>(&sendAddr), sizeof(sendAddr)),
-              SyscallSucceedsWithValue(sizeof(send_buf)));
+  EXPECT_THAT(
+      RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0,
+                         reinterpret_cast<sockaddr*>(&send_addr.addr),
+                         send_addr.addr_len),
+      SyscallSucceedsWithValue(sizeof(send_buf)));
 
   // Check that we received the multicast packet.
   char recv_buf[sizeof(send_buf)] = {};
@@ -230,49 +229,45 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastLoopbackNic) {
 
   // Bind the first FD to the loopback. This is an alternative to
   // IP_MULTICAST_IF for setting the default send interface.
-  sockaddr_in senderAddr = {};
-  senderAddr.sin_family = AF_INET;
-  senderAddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+  auto sender_addr = V4Loopback();
   EXPECT_THAT(
-      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&senderAddr),
-           sizeof(senderAddr)),
+      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&sender_addr.addr),
+           sender_addr.addr_len),
       SyscallSucceeds());
 
   // Bind the second FD to the v4 any address to ensure that we can receive the
   // multicast packet.
-  sockaddr_in receiverAddr = {};
-  receiverAddr.sin_family = AF_INET;
-  receiverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
-  EXPECT_THAT(
-      bind(sockets->second_fd(), reinterpret_cast<sockaddr*>(&receiverAddr),
-           sizeof(receiverAddr)),
-      SyscallSucceeds());
-  socklen_t receiverAddrLen = sizeof(receiverAddr);
-  EXPECT_THAT(
-      getsockname(sockets->second_fd(),
-                  reinterpret_cast<sockaddr*>(&receiverAddr), &receiverAddrLen),
-      SyscallSucceeds());
-  EXPECT_EQ(receiverAddrLen, sizeof(receiverAddr));
+  auto receiver_addr = V4Any();
+  EXPECT_THAT(bind(sockets->second_fd(),
+                   reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                   receiver_addr.addr_len),
+              SyscallSucceeds());
+  socklen_t receiver_addr_len = receiver_addr.addr_len;
+  EXPECT_THAT(getsockname(sockets->second_fd(),
+                          reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                          &receiver_addr_len),
+              SyscallSucceeds());
+  EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len);
 
   // Register to receive multicast packets.
   ip_mreqn group = {};
-  group.imr_multiaddr.s_addr = inet_addr("224.0.2.1");
+  group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress);
   group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo"));
   EXPECT_THAT(setsockopt(sockets->second_fd(), IPPROTO_IP, IP_ADD_MEMBERSHIP,
                          &group, sizeof(group)),
               SyscallSucceeds());
 
   // Send a multicast packet.
-  sockaddr_in sendAddr = {};
-  sendAddr.sin_family = AF_INET;
-  sendAddr.sin_port = receiverAddr.sin_port;
-  sendAddr.sin_addr.s_addr = inet_addr("224.0.2.1");
+  auto send_addr = V4Multicast();
+  reinterpret_cast<sockaddr_in*>(&send_addr.addr)->sin_port =
+      reinterpret_cast<sockaddr_in*>(&receiver_addr.addr)->sin_port;
   char send_buf[200];
   RandomizeBuffer(send_buf, sizeof(send_buf));
-  EXPECT_THAT(RetryEINTR(sendto)(
-                  sockets->first_fd(), send_buf, sizeof(send_buf), 0,
-                  reinterpret_cast<sockaddr*>(&sendAddr), sizeof(sendAddr)),
-              SyscallSucceedsWithValue(sizeof(send_buf)));
+  EXPECT_THAT(
+      RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0,
+                         reinterpret_cast<sockaddr*>(&send_addr.addr),
+                         send_addr.addr_len),
+      SyscallSucceedsWithValue(sizeof(send_buf)));
 
   // Check that we received the multicast packet.
   char recv_buf[sizeof(send_buf)] = {};
@@ -289,7 +284,7 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastInvalidDrop) {
 
   // Unregister from a membership that we didn't have.
   ip_mreq group = {};
-  group.imr_multiaddr.s_addr = inet_addr("224.0.2.1");
+  group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress);
   group.imr_interface.s_addr = htonl(INADDR_LOOPBACK);
   EXPECT_THAT(setsockopt(sockets->first_fd(), IPPROTO_IP, IP_DROP_MEMBERSHIP,
                          &group, sizeof(group)),
@@ -304,33 +299,29 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastDropAddr) {
 
   // Bind the first FD to the loopback. This is an alternative to
   // IP_MULTICAST_IF for setting the default send interface.
-  sockaddr_in senderAddr = {};
-  senderAddr.sin_family = AF_INET;
-  senderAddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+  auto sender_addr = V4Loopback();
   EXPECT_THAT(
-      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&senderAddr),
-           sizeof(senderAddr)),
+      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&sender_addr.addr),
+           sender_addr.addr_len),
       SyscallSucceeds());
 
   // Bind the second FD to the v4 any address to ensure that we can receive the
   // multicast packet.
-  sockaddr_in receiverAddr = {};
-  receiverAddr.sin_family = AF_INET;
-  receiverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
-  EXPECT_THAT(
-      bind(sockets->second_fd(), reinterpret_cast<sockaddr*>(&receiverAddr),
-           sizeof(receiverAddr)),
-      SyscallSucceeds());
-  socklen_t receiverAddrLen = sizeof(receiverAddr);
-  EXPECT_THAT(
-      getsockname(sockets->second_fd(),
-                  reinterpret_cast<sockaddr*>(&receiverAddr), &receiverAddrLen),
-      SyscallSucceeds());
-  EXPECT_EQ(receiverAddrLen, sizeof(receiverAddr));
+  auto receiver_addr = V4Any();
+  EXPECT_THAT(bind(sockets->second_fd(),
+                   reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                   receiver_addr.addr_len),
+              SyscallSucceeds());
+  socklen_t receiver_addr_len = receiver_addr.addr_len;
+  EXPECT_THAT(getsockname(sockets->second_fd(),
+                          reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                          &receiver_addr_len),
+              SyscallSucceeds());
+  EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len);
 
   // Register and unregister to receive multicast packets.
   ip_mreq group = {};
-  group.imr_multiaddr.s_addr = inet_addr("224.0.2.1");
+  group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress);
   group.imr_interface.s_addr = htonl(INADDR_LOOPBACK);
   EXPECT_THAT(setsockopt(sockets->second_fd(), IPPROTO_IP, IP_ADD_MEMBERSHIP,
                          &group, sizeof(group)),
@@ -340,16 +331,16 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastDropAddr) {
               SyscallSucceeds());
 
   // Send a multicast packet.
-  sockaddr_in sendAddr = {};
-  sendAddr.sin_family = AF_INET;
-  sendAddr.sin_port = receiverAddr.sin_port;
-  sendAddr.sin_addr.s_addr = inet_addr("224.0.2.1");
+  auto send_addr = V4Multicast();
+  reinterpret_cast<sockaddr_in*>(&send_addr.addr)->sin_port =
+      reinterpret_cast<sockaddr_in*>(&receiver_addr.addr)->sin_port;
   char send_buf[200];
   RandomizeBuffer(send_buf, sizeof(send_buf));
-  EXPECT_THAT(RetryEINTR(sendto)(
-                  sockets->first_fd(), send_buf, sizeof(send_buf), 0,
-                  reinterpret_cast<sockaddr*>(&sendAddr), sizeof(sendAddr)),
-              SyscallSucceedsWithValue(sizeof(send_buf)));
+  EXPECT_THAT(
+      RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0,
+                         reinterpret_cast<sockaddr*>(&send_addr.addr),
+                         send_addr.addr_len),
+      SyscallSucceedsWithValue(sizeof(send_buf)));
 
   // Check that we did not receive the multicast packet.
   char recv_buf[sizeof(send_buf)] = {};
@@ -366,33 +357,29 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastDropNic) {
 
   // Bind the first FD to the loopback. This is an alternative to
   // IP_MULTICAST_IF for setting the default send interface.
-  sockaddr_in senderAddr = {};
-  senderAddr.sin_family = AF_INET;
-  senderAddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+  auto sender_addr = V4Loopback();
   EXPECT_THAT(
-      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&senderAddr),
-           sizeof(senderAddr)),
+      bind(sockets->first_fd(), reinterpret_cast<sockaddr*>(&sender_addr.addr),
+           sender_addr.addr_len),
       SyscallSucceeds());
 
   // Bind the second FD to the v4 any address to ensure that we can receive the
   // multicast packet.
-  sockaddr_in receiverAddr = {};
-  receiverAddr.sin_family = AF_INET;
-  receiverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
-  EXPECT_THAT(
-      bind(sockets->second_fd(), reinterpret_cast<sockaddr*>(&receiverAddr),
-           sizeof(receiverAddr)),
-      SyscallSucceeds());
-  socklen_t receiverAddrLen = sizeof(receiverAddr);
-  EXPECT_THAT(
-      getsockname(sockets->second_fd(),
-                  reinterpret_cast<sockaddr*>(&receiverAddr), &receiverAddrLen),
-      SyscallSucceeds());
-  EXPECT_EQ(receiverAddrLen, sizeof(receiverAddr));
+  auto receiver_addr = V4Any();
+  EXPECT_THAT(bind(sockets->second_fd(),
+                   reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                   receiver_addr.addr_len),
+              SyscallSucceeds());
+  socklen_t receiver_addr_len = receiver_addr.addr_len;
+  EXPECT_THAT(getsockname(sockets->second_fd(),
+                          reinterpret_cast<sockaddr*>(&receiver_addr.addr),
+                          &receiver_addr_len),
+              SyscallSucceeds());
+  EXPECT_EQ(receiver_addr_len, receiver_addr.addr_len);
 
   // Register and unregister to receive multicast packets.
   ip_mreqn group = {};
-  group.imr_multiaddr.s_addr = inet_addr("224.0.2.1");
+  group.imr_multiaddr.s_addr = inet_addr(kMulticastAddress);
   group.imr_ifindex = ASSERT_NO_ERRNO_AND_VALUE(InterfaceIndex("lo"));
   EXPECT_THAT(setsockopt(sockets->second_fd(), IPPROTO_IP, IP_ADD_MEMBERSHIP,
                          &group, sizeof(group)),
@@ -402,16 +389,16 @@ TEST_P(IPv4UDPUnboundSocketPairTest, IpMulticastDropNic) {
               SyscallSucceeds());
 
   // Send a multicast packet.
-  sockaddr_in sendAddr = {};
-  sendAddr.sin_family = AF_INET;
-  sendAddr.sin_port = receiverAddr.sin_port;
-  sendAddr.sin_addr.s_addr = inet_addr("224.0.2.1");
+  auto send_addr = V4Multicast();
+  reinterpret_cast<sockaddr_in*>(&send_addr.addr)->sin_port =
+      reinterpret_cast<sockaddr_in*>(&receiver_addr.addr)->sin_port;
   char send_buf[200];
   RandomizeBuffer(send_buf, sizeof(send_buf));
-  EXPECT_THAT(RetryEINTR(sendto)(
-                  sockets->first_fd(), send_buf, sizeof(send_buf), 0,
-                  reinterpret_cast<sockaddr*>(&sendAddr), sizeof(sendAddr)),
-              SyscallSucceedsWithValue(sizeof(send_buf)));
+  EXPECT_THAT(
+      RetryEINTR(sendto)(sockets->first_fd(), send_buf, sizeof(send_buf), 0,
+                         reinterpret_cast<sockaddr*>(&send_addr.addr),
+                         send_addr.addr_len),
+      SyscallSucceedsWithValue(sizeof(send_buf)));
 
   // Check that we did not receive the multicast packet.
   char recv_buf[sizeof(send_buf)] = {};
diff --git a/test/syscalls/linux/socket_test_util.cc b/test/syscalls/linux/socket_test_util.cc
index 49b8c583f..8d19f79ac 100644
--- a/test/syscalls/linux/socket_test_util.cc
+++ b/test/syscalls/linux/socket_test_util.cc
@@ -680,5 +680,56 @@ void RecvNoData(int sock) {
               SyscallFailsWithErrno(EAGAIN));
 }
 
+TestAddress V4Any() {
+  TestAddress t("V4Any");
+  t.addr.ss_family = AF_INET;
+  t.addr_len = sizeof(sockaddr_in);
+  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr = htonl(INADDR_ANY);
+  return t;
+}
+
+TestAddress V4Loopback() {
+  TestAddress t("V4Loopback");
+  t.addr.ss_family = AF_INET;
+  t.addr_len = sizeof(sockaddr_in);
+  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr =
+      htonl(INADDR_LOOPBACK);
+  return t;
+}
+
+TestAddress V4MappedAny() {
+  TestAddress t("V4MappedAny");
+  t.addr.ss_family = AF_INET6;
+  t.addr_len = sizeof(sockaddr_in6);
+  inet_pton(AF_INET6, "::ffff:0.0.0.0",
+            reinterpret_cast<sockaddr_in6*>(&t.addr)->sin6_addr.s6_addr);
+  return t;
+}
+
+TestAddress V4MappedLoopback() {
+  TestAddress t("V4MappedLoopback");
+  t.addr.ss_family = AF_INET6;
+  t.addr_len = sizeof(sockaddr_in6);
+  inet_pton(AF_INET6, "::ffff:127.0.0.1",
+            reinterpret_cast<sockaddr_in6*>(&t.addr)->sin6_addr.s6_addr);
+  return t;
+}
+
+TestAddress V6Any() {
+  TestAddress t("V6Any");
+  t.addr.ss_family = AF_INET6;
+  t.addr_len = sizeof(sockaddr_in6);
+  reinterpret_cast<sockaddr_in6*>(&t.addr)->sin6_addr = in6addr_any;
+  return t;
+}
+
+TestAddress V6Loopback() {
+  TestAddress t("V6Loopback");
+  t.addr.ss_family = AF_INET6;
+  t.addr_len = sizeof(sockaddr_in6);
+  reinterpret_cast<sockaddr_in6*>(&t.addr)->sin6_addr = in6addr_loopback;
+  return t;
+}
+
 }  // namespace testing
 }  // namespace gvisor
diff --git a/test/syscalls/linux/socket_test_util.h b/test/syscalls/linux/socket_test_util.h
index 826374dc6..906b3e929 100644
--- a/test/syscalls/linux/socket_test_util.h
+++ b/test/syscalls/linux/socket_test_util.h
@@ -449,6 +449,23 @@ void RecvNoData(int sock);
 // sockets.
 using AllSocketPairTest = SocketPairTest;
 
+struct TestAddress {
+  std::string description;
+  sockaddr_storage addr;
+  socklen_t addr_len;
+
+  int family() const { return addr.ss_family; }
+  explicit TestAddress(std::string description = "")
+      : description(std::move(description)), addr(), addr_len() {}
+};
+
+TestAddress V4Any();
+TestAddress V4Loopback();
+TestAddress V4MappedAny();
+TestAddress V4MappedLoopback();
+TestAddress V6Any();
+TestAddress V6Loopback();
+
 }  // namespace testing
 }  // namespace gvisor