#define BSD_AFNUM_ISO 7
#define BSD_AFNUM_APPLETALK 16
#define BSD_AFNUM_IPX 23
-#define BSD_AFNUM_INET6_BSD 24 /* OpenBSD (and probably NetBSD), BSD/OS */
-#define BSD_AFNUM_INET6_FREEBSD 28
-#define BSD_AFNUM_INET6_DARWIN 30
+#define BSD_AFNUM_INET6_BSD 24 /* NetBSD, OpenBSD, BSD/OS, Npcap */
+#define BSD_AFNUM_INET6_FREEBSD 28 /* FreeBSD */
+#define BSD_AFNUM_INET6_DARWIN 30 /* OS X, iOS, other Darwin-based OSes */