diff --git a/include/utils.h b/include/utils.h
index 28eaad8e..c9849461 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -109,17 +109,6 @@ static inline bool is_addrtype_inet_not_multi(const inet_prefix *p)
 	return (p->flags & ADDRTYPE_INET_MULTI) == ADDRTYPE_INET;
 }
 
-#define DN_MAXADDL 20
-#ifndef AF_DECnet
-#define AF_DECnet 12
-#endif
-
-struct dn_naddr
-{
-        unsigned short          a_len;
-        unsigned char a_addr[DN_MAXADDL];
-};
-
 #ifndef AF_MPLS
 # define AF_MPLS 28
 #endif
diff --git a/ip/ip.c b/ip/ip.c
index e7ffeaff..b07a5c7d 100644
--- a/ip/ip.c
+++ b/ip/ip.c
@@ -72,7 +72,7 @@ static void usage(void)
 		"       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
 		"                    -h[uman-readable] | -iec | -j[son] | -p[retty] |\n"
 		"                    -f[amily] { inet | inet6 | mpls | bridge | link } |\n"
-		"                    -4 | -6 | -I | -D | -M | -B | -0 |\n"
+		"                    -4 | -6 | -M | -B | -0 |\n"
 		"                    -l[oops] { maximum-addr-flush-attempts } | -br[ief] |\n"
 		"                    -o[neline] | -t[imestamp] | -ts[hort] | -b[atch] [filename] |\n"
 		"                    -rc[vbuf] [size] | -n[etns] name | -N[umeric] | -a[ll] |\n"
@@ -224,8 +224,6 @@ int main(int argc, char **argv)
 			preferred_family = AF_INET6;
 		} else if (strcmp(opt, "-0") == 0) {
 			preferred_family = AF_PACKET;
-		} else if (strcmp(opt, "-D") == 0) {
-			preferred_family = AF_DECnet;
 		} else if (strcmp(opt, "-M") == 0) {
 			preferred_family = AF_MPLS;
 		} else if (strcmp(opt, "-B") == 0) {
diff --git a/ip/ipneigh.c b/ip/ipneigh.c
index 95bde520..b778de00 100644
--- a/ip/ipneigh.c
+++ b/ip/ipneigh.c
@@ -328,8 +328,7 @@ int print_neigh(struct nlmsghdr *n, void *arg)
 	if (!(filter.state&r->ndm_state) &&
 	    !(r->ndm_flags & NTF_PROXY) &&
 	    !(r->ndm_flags & NTF_EXT_LEARNED) &&
-	    (r->ndm_state || !(filter.state&0x100)) &&
-	    (r->ndm_family != AF_DECnet))
+	    (r->ndm_state || !(filter.state&0x100)))
 		return 0;
 
 	if (filter.master && !(n->nlmsg_flags & NLM_F_DUMP_FILTERED)) {
diff --git a/lib/utils.c b/lib/utils.c
index 0559923b..53d31006 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -540,7 +540,7 @@ static int __get_addr_1(inet_prefix *addr, const char *name, int family)
 	memset(addr, 0, sizeof(*addr));
 
 	if (strcmp(name, "default") == 0) {
-		if ((family == AF_DECnet) || (family == AF_MPLS))
+		if (family == AF_MPLS)
 			return -1;
 		addr->family = family;
 		addr->bytelen = af_byte_len(addr->family);
@@ -551,7 +551,7 @@ static int __get_addr_1(inet_prefix *addr, const char *name, int family)
 
 	if (strcmp(name, "all") == 0 ||
 	    strcmp(name, "any") == 0) {
-		if ((family == AF_DECnet) || (family == AF_MPLS))
+		if (family == AF_MPLS)
 			return -1;
 		addr->family = family;
 		addr->bytelen = 0;
@@ -636,10 +636,6 @@ int af_bit_len(int af)
 		return 128;
 	case AF_INET:
 		return 32;
-	case AF_DECnet:
-		return 16;
-	case AF_IPX:
-		return 80;
 	case AF_MPLS:
 		return 20;
 	}
@@ -729,16 +725,6 @@ int get_addr_rta(inet_prefix *dst, const struct rtattr *rta, int family)
 		dst->bytelen = 16;
 		memcpy(dst->data, data, 16);
 		break;
-	case 2:
-		dst->family = AF_DECnet;
-		dst->bytelen = 2;
-		memcpy(dst->data, data, 2);
-		break;
-	case 10:
-		dst->family = AF_IPX;
-		dst->bytelen = 10;
-		memcpy(dst->data, data, 10);
-		break;
 	default:
 		return -1;
 	}
@@ -1029,8 +1015,6 @@ int read_family(const char *name)
 		family = AF_INET6;
 	else if (strcmp(name, "link") == 0)
 		family = AF_PACKET;
-	else if (strcmp(name, "ipx") == 0)
-		family = AF_IPX;
 	else if (strcmp(name, "mpls") == 0)
 		family = AF_MPLS;
 	else if (strcmp(name, "bridge") == 0)
@@ -1046,8 +1030,6 @@ const char *family_name(int family)
 		return "inet6";
 	if (family == AF_PACKET)
 		return "link";
-	if (family == AF_IPX)
-		return "ipx";
 	if (family == AF_MPLS)
 		return "mpls";
 	if (family == AF_BRIDGE)
diff --git a/man/man8/ip.8 b/man/man8/ip.8
index c3598a02..2a4848b7 100644
--- a/man/man8/ip.8
+++ b/man/man8/ip.8
@@ -37,8 +37,6 @@ ip \- show / manipulate routing, network devices, interfaces and tunnels
 .BR inet " | " inet6 " | " link " } | "
 \fB-4\fR |
 \fB-6\fR |
-\fB-I\fR |
-\fB-D\fR |
 \fB-B\fR |
 \fB-0\fR |
 \fB-l\fR[\fIoops\fR] { \fBmaximum-addr-flush-attempts\fR } |