diff --git a/include/uv.h b/include/uv.h
index 6a385583..c281ed4d 100644
--- a/include/uv.h
+++ b/include/uv.h
@@ -1526,6 +1526,7 @@ struct uv_cpu_info_s {
 
 struct uv_interface_address_s {
   char* name;
+  char phys_addr[6];
   int is_internal;
   union {
     struct sockaddr_in address4;
diff --git a/src/unix/darwin.c b/src/unix/darwin.c
index e716cfb3..81570f39 100644
--- a/src/unix/darwin.c
+++ b/src/unix/darwin.c
@@ -27,6 +27,7 @@
 
 #include <ifaddrs.h>
 #include <net/if.h>
+#include <net/if_dl.h>
 
 #include <CoreFoundation/CFRunLoop.h>
 
@@ -355,6 +356,8 @@ void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count) {
 int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
   struct ifaddrs *addrs, *ent;
   uv_interface_address_t* address;
+  int i;
+  struct sockaddr_dl *sa_addr;
 
   if (getifaddrs(&addrs))
     return -errno;
@@ -363,7 +366,7 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
 
   /* Count the number of interfaces */
   for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
-    if (!(ent->ifa_flags & IFF_UP && ent->ifa_flags & IFF_RUNNING) ||
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
         (ent->ifa_addr == NULL) ||
         (ent->ifa_addr->sa_family == AF_LINK)) {
       continue;
@@ -379,21 +382,18 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
   address = *addresses;
 
   for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
-    if (!(ent->ifa_flags & IFF_UP && ent->ifa_flags & IFF_RUNNING)) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
       continue;
-    }
 
-    if (ent->ifa_addr == NULL) {
+    if (ent->ifa_addr == NULL)
       continue;
-    }
 
     /*
      * On Mac OS X getifaddrs returns information related to Mac Addresses for
      * various devices, such as firewire, etc. These are not relevant here.
      */
-    if (ent->ifa_addr->sa_family == AF_LINK) {
+    if (ent->ifa_addr->sa_family == AF_LINK)
       continue;
-    }
 
     address->name = strdup(ent->ifa_name);
 
@@ -409,11 +409,30 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
       address->netmask.netmask4 = *((struct sockaddr_in*) ent->ifa_netmask);
     }
 
-    address->is_internal = ent->ifa_flags & IFF_LOOPBACK ? 1 : 0;
+    address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK);
 
     address++;
   }
 
+  /* Fill in physical addresses for each interface */
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
+        (ent->ifa_addr == NULL) ||
+        (ent->ifa_addr->sa_family != AF_LINK)) {
+      continue;
+    }
+
+    address = *addresses;
+
+    for (i = 0; i < (*count); i++) {
+      if (strcmp(address->name, ent->ifa_name) == 0) {
+        sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
+        memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
+      }
+      address++;
+    }
+  }
+
   freeifaddrs(addrs);
 
   return 0;
diff --git a/src/unix/freebsd.c b/src/unix/freebsd.c
index afdc4095..b1e8eb7d 100644
--- a/src/unix/freebsd.c
+++ b/src/unix/freebsd.c
@@ -25,6 +25,10 @@
 #include <string.h>
 #include <errno.h>
 
+#include <ifaddrs.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+
 #include <kvm.h>
 #include <paths.h>
 #include <sys/user.h>
@@ -322,13 +326,98 @@ void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count) {
 
 
 int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
-  /* TODO: implement */
-  *addresses = NULL;
-  *count = 0;
+  struct ifaddrs *addrs, *ent;
+  uv_interface_address_t* address;
+  int i;
+  struct sockaddr_dl *sa_addr;
+
+  if (getifaddrs(&addrs))
+    return -errno;
+
+   *count = 0;
+
+  /* Count the number of interfaces */
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
+        (ent->ifa_addr == NULL) ||
+        (ent->ifa_addr->sa_family == AF_LINK)) {
+      continue;
+    }
+
+    (*count)++;
+  }
+
+  *addresses = malloc(*count * sizeof(**addresses));
+  if (!(*addresses))
+    return -ENOMEM;
+
+  address = *addresses;
+
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
+      continue;
+
+    if (ent->ifa_addr == NULL)
+      continue;
+
+    /*
+     * On FreeBSD getifaddrs returns information related to the raw underlying
+     * devices. We're not interested in this information yet.
+     */
+    if (ent->ifa_addr->sa_family == AF_LINK)
+      continue;
+
+    address->name = strdup(ent->ifa_name);
+
+    if (ent->ifa_addr->sa_family == AF_INET6) {
+      address->address.address6 = *((struct sockaddr_in6*) ent->ifa_addr);
+    } else {
+      address->address.address4 = *((struct sockaddr_in*) ent->ifa_addr);
+    }
+
+    if (ent->ifa_netmask->sa_family == AF_INET6) {
+      address->netmask.netmask6 = *((struct sockaddr_in6*) ent->ifa_netmask);
+    } else {
+      address->netmask.netmask4 = *((struct sockaddr_in*) ent->ifa_netmask);
+    }
+
+    address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK);
+
+    address++;
+  }
+
+  /* Fill in physical addresses for each interface */
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
+        (ent->ifa_addr == NULL) ||
+        (ent->ifa_addr->sa_family != AF_LINK)) {
+      continue;
+    }
+
+    address = *addresses;
+
+    for (i = 0; i < (*count); i++) {
+      if (strcmp(address->name, ent->ifa_name) == 0) {
+        sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
+        memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
+      }
+      address++;
+    }
+  }
+
+  freeifaddrs(addrs);
+
   return 0;
 }
 
 
 void uv_free_interface_addresses(uv_interface_address_t* addresses,
   int count) {
+  int i;
+
+  for (i = 0; i < count; i++) {
+    free(addresses[i].name);
+  }
+
+  free(addresses);
 }
diff --git a/src/unix/linux-core.c b/src/unix/linux-core.c
index 8365ea86..fa5dec19 100644
--- a/src/unix/linux-core.c
+++ b/src/unix/linux-core.c
@@ -47,6 +47,9 @@
 #endif
 #ifdef HAVE_IFADDRS_H
 # include <ifaddrs.h>
+# include <sys/socket.h>
+# include <net/ethernet.h>
+# include <linux/if_packet.h>
 #endif
 
 #undef NANOSEC
@@ -624,8 +627,9 @@ int uv_interface_addresses(uv_interface_address_t** addresses,
   return -ENOSYS;
 #else
   struct ifaddrs *addrs, *ent;
-  char ip[INET6_ADDRSTRLEN];
   uv_interface_address_t* address;
+  int i;
+  struct sockaddr_ll *sll;
 
   if (getifaddrs(&addrs))
     return -errno;
@@ -634,7 +638,7 @@ int uv_interface_addresses(uv_interface_address_t** addresses,
 
   /* Count the number of interfaces */
   for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
-    if (!(ent->ifa_flags & IFF_UP && ent->ifa_flags & IFF_RUNNING) ||
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
         (ent->ifa_addr == NULL) ||
         (ent->ifa_addr->sa_family == PF_PACKET)) {
       continue;
@@ -650,22 +654,18 @@ int uv_interface_addresses(uv_interface_address_t** addresses,
   address = *addresses;
 
   for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
-    bzero(&ip, sizeof (ip));
-    if (!(ent->ifa_flags & IFF_UP && ent->ifa_flags & IFF_RUNNING)) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
       continue;
-    }
 
-    if (ent->ifa_addr == NULL) {
+    if (ent->ifa_addr == NULL)
       continue;
-    }
 
     /*
      * On Linux getifaddrs returns information related to the raw underlying
-     * devices. We're not interested in this information.
+     * devices. We're not interested in this information yet.
      */
-    if (ent->ifa_addr->sa_family == PF_PACKET) {
+    if (ent->ifa_addr->sa_family == PF_PACKET)
       continue;
-    }
 
     address->name = strdup(ent->ifa_name);
 
@@ -681,11 +681,30 @@ int uv_interface_addresses(uv_interface_address_t** addresses,
       address->netmask.netmask4 = *((struct sockaddr_in*) ent->ifa_netmask);
     }
 
-    address->is_internal = ent->ifa_flags & IFF_LOOPBACK ? 1 : 0;
+    address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK);
 
     address++;
   }
 
+  /* Fill in physical addresses for each interface */
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
+        (ent->ifa_addr == NULL) ||
+        (ent->ifa_addr->sa_family != PF_PACKET)) {
+      continue;
+    }
+
+    address = *addresses;
+
+    for (i = 0; i < (*count); i++) {
+      if (strcmp(address->name, ent->ifa_name) == 0) {
+        sll = (struct sockaddr_ll*)ent->ifa_addr;
+        memcpy(address->phys_addr, sll->sll_addr, sizeof(address->phys_addr));
+      }
+      address++;
+    }
+  }
+
   freeifaddrs(addrs);
 
   return 0;
diff --git a/src/unix/netbsd.c b/src/unix/netbsd.c
index 8c7197eb..0722a6bf 100644
--- a/src/unix/netbsd.c
+++ b/src/unix/netbsd.c
@@ -34,6 +34,7 @@
 #include <fcntl.h>
 
 #include <net/if.h>
+#include <net/if_dl.h>
 #include <sys/resource.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>
@@ -274,9 +275,10 @@ void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count) {
 
 
 int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
-  struct ifaddrs *addrs;
-  struct ifaddrs *ent;
+  struct ifaddrs *addrs, *ent;
   uv_interface_address_t* address;
+  int i;
+  struct sockaddr_dl *sa_addr;
 
   if (getifaddrs(&addrs))
     return -errno;
@@ -285,7 +287,7 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
 
   /* Count the number of interfaces */
   for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
-    if (!(ent->ifa_flags & IFF_UP && ent->ifa_flags & IFF_RUNNING) ||
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
         (ent->ifa_addr == NULL) ||
         (ent->ifa_addr->sa_family != PF_INET)) {
       continue;
@@ -301,17 +303,14 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
   address = *addresses;
 
   for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
-    if (!(ent->ifa_flags & IFF_UP && ent->ifa_flags & IFF_RUNNING)) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
       continue;
-    }
 
-    if (ent->ifa_addr == NULL) {
+    if (ent->ifa_addr == NULL)
       continue;
-    }
 
-    if (ent->ifa_addr->sa_family != PF_INET) {
+    if (ent->ifa_addr->sa_family != PF_INET)
       continue;
-    }
 
     address->name = strdup(ent->ifa_name);
 
@@ -327,11 +326,30 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
       address->netmask.netmask4 = *((struct sockaddr_in*) ent->ifa_netmask);
     }
 
-    address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK) ? 1 : 0;
+    address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK);
 
     address++;
   }
 
+  /* Fill in physical addresses for each interface */
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
+        (ent->ifa_addr == NULL) ||
+        (ent->ifa_addr->sa_family != AF_LINK)) {
+      continue;
+    }
+
+    address = *addresses;
+
+    for (i = 0; i < (*count); i++) {
+      if (strcmp(address->name, ent->ifa_name) == 0) {
+        sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
+        memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
+      }
+      address++;
+    }
+  }
+
   freeifaddrs(addrs);
 
   return 0;
diff --git a/src/unix/openbsd.c b/src/unix/openbsd.c
index 5f112e34..30f6fbdc 100644
--- a/src/unix/openbsd.c
+++ b/src/unix/openbsd.c
@@ -28,6 +28,10 @@
 #include <sys/time.h>
 #include <sys/sysctl.h>
 
+#include <ifaddrs.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+
 #include <errno.h>
 #include <fcntl.h>
 #include <kvm.h>
@@ -291,13 +295,94 @@ void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count) {
 
 int uv_interface_addresses(uv_interface_address_t** addresses,
   int* count) {
-  /* TODO: implement */
-  *addresses = NULL;
-  *count = 0;
+  struct ifaddrs *addrs, *ent;
+  uv_interface_address_t* address;
+  int i;
+  struct sockaddr_dl *sa_addr;
+
+  if (getifaddrs(&addrs) != 0)
+    return -errno;
+
+   *count = 0;
+
+  /* Count the number of interfaces */
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
+        (ent->ifa_addr == NULL) ||
+        (ent->ifa_addr->sa_family != PF_INET)) {
+      continue;
+    }
+    (*count)++;
+  }
+
+  *addresses = malloc(*count * sizeof(**addresses));
+
+  if (!(*addresses))
+    return -ENOMEM;
+
+  address = *addresses;
+
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
+      continue;
+
+    if (ent->ifa_addr == NULL)
+      continue;
+
+    if (ent->ifa_addr->sa_family != PF_INET)
+      continue;
+
+    address->name = strdup(ent->ifa_name);
+
+    if (ent->ifa_addr->sa_family == AF_INET6) {
+      address->address.address6 = *((struct sockaddr_in6*) ent->ifa_addr);
+    } else {
+      address->address.address4 = *((struct sockaddr_in*) ent->ifa_addr);
+    }
+
+    if (ent->ifa_netmask->sa_family == AF_INET6) {
+      address->netmask.netmask6 = *((struct sockaddr_in6*) ent->ifa_netmask);
+    } else {
+      address->netmask.netmask4 = *((struct sockaddr_in*) ent->ifa_netmask);
+    }
+
+    address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK);
+
+    address++;
+  }
+
+  /* Fill in physical addresses for each interface */
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
+        (ent->ifa_addr == NULL) ||
+        (ent->ifa_addr->sa_family != AF_LINK)) {
+      continue;
+    }
+
+    address = *addresses;
+
+    for (i = 0; i < (*count); i++) {
+      if (strcmp(address->name, ent->ifa_name) == 0) {
+        sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
+        memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
+      }
+      address++;
+    }
+  }
+
+  freeifaddrs(addrs);
+
   return 0;
 }
 
 
 void uv_free_interface_addresses(uv_interface_address_t* addresses,
   int count) {
+  int i;
+
+  for (i = 0; i < count; i++) {
+    free(addresses[i].name);
+  }
+
+  free(addresses);
 }
diff --git a/src/unix/sunos.c b/src/unix/sunos.c
index 829f0723..8df65b70 100644
--- a/src/unix/sunos.c
+++ b/src/unix/sunos.c
@@ -32,6 +32,7 @@
 # include <ifaddrs.h>
 #endif
 #include <net/if.h>
+#include <net/if_dl.h>
 
 #include <sys/loadavg.h>
 #include <sys/time.h>
@@ -580,7 +581,6 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
   return -ENOSYS;
 #else
   struct ifaddrs *addrs, *ent;
-  char ip[INET6_ADDRSTRLEN];
   uv_interface_address_t* address;
 
   if (getifaddrs(&addrs))
@@ -590,7 +590,7 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
 
   /* Count the number of interfaces */
   for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
-    if (!(ent->ifa_flags & IFF_UP && ent->ifa_flags & IFF_RUNNING) ||
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
         (ent->ifa_addr == NULL) ||
         (ent->ifa_addr->sa_family == PF_PACKET)) {
       continue;
@@ -606,15 +606,11 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
   address = *addresses;
 
   for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
-    memset(&ip, 0, sizeof(ip));
-
-    if (!(ent->ifa_flags & IFF_UP && ent->ifa_flags & IFF_RUNNING)) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
       continue;
-    }
 
-    if (ent->ifa_addr == NULL) {
+    if (ent->ifa_addr == NULL)
       continue;
-    }
 
     address->name = strdup(ent->ifa_name);
 
@@ -630,12 +626,31 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
       address->netmask.netmask4 = *((struct sockaddr_in*) ent->ifa_netmask);
     }
 
-    address->is_internal = ent->ifa_flags & IFF_PRIVATE || ent->ifa_flags &
-	IFF_LOOPBACK ? 1 : 0;
+    address->is_internal = !!((ent->ifa_flags & IFF_PRIVATE) ||
+                           (ent->ifa_flags & IFF_LOOPBACK));
 
     address++;
   }
 
+  /* Fill in physical addresses for each interface */
+  for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
+    if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) ||
+        (ent->ifa_addr == NULL) ||
+        (ent->ifa_addr->sa_family != AF_LINK)) {
+      continue;
+    }
+
+    address = *addresses;
+
+    for (i = 0; i < (*count); i++) {
+      if (strcmp(address->name, ent->ifa_name) == 0) {
+        sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
+        memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
+      }
+      address++;
+    }
+  }
+
   freeifaddrs(addrs);
 
   return 0;
diff --git a/src/win/util.c b/src/win/util.c
index fe373ff0..a8183438 100644
--- a/src/win/util.c
+++ b/src/win/util.c
@@ -940,6 +940,13 @@ int uv_interface_addresses(uv_interface_address_t** addresses_ptr,
       memset(uv_address, 0, sizeof *uv_address);
 
       uv_address->name = name_buf;
+
+      if (win_address->PhysicalAddressLength == sizeof(uv_address->phys_addr)) {
+        memcpy(uv_address->phys_addr,
+               win_address->PhysicalAddress,
+               sizeof(uv_address->phys_addr));
+      }
+
       uv_address->is_internal =
           (win_address->IfType == IF_TYPE_SOFTWARE_LOOPBACK);
 
diff --git a/test/test-platform-output.c b/test/test-platform-output.c
index 4e029e4f..d2104f40 100644
--- a/test/test-platform-output.c
+++ b/test/test-platform-output.c
@@ -72,6 +72,14 @@ TEST_IMPL(platform_output) {
   for (i = 0; i < count; i++) {
     printf("  name: %s\n", interfaces[i].name);
     printf("  internal: %d\n", interfaces[i].is_internal);
+    printf("  physical address: ");
+    printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
+           (unsigned char)interfaces[i].phys_addr[0],
+           (unsigned char)interfaces[i].phys_addr[1],
+           (unsigned char)interfaces[i].phys_addr[2],
+           (unsigned char)interfaces[i].phys_addr[3],
+           (unsigned char)interfaces[i].phys_addr[4],
+           (unsigned char)interfaces[i].phys_addr[5]);
 
     if (interfaces[i].address.address4.sin_family == AF_INET) {
       uv_ip4_name(&interfaces[i].address.address4, buffer, sizeof(buffer));