diff --git a/etc/namedb/named.conf b/etc/namedb/named.conf
index 27c30aed1cf3..f1669abbab8c 100644
--- a/etc/namedb/named.conf
+++ b/etc/namedb/named.conf
@@ -122,18 +122,18 @@ zone "arpa" {
 	1. Faster local resolution for your users
 	2. No spurious traffic will be sent from your network to the roots
 */
-// RFCs 1912 and 5735 (and BCP 32 for localhost)
+// RFCs 1912, 5735 and 6303 (and BCP 32 for localhost)
 zone "localhost"	{ type master; file "/etc/namedb/master/localhost-forward.db"; };
 zone "127.in-addr.arpa"	{ type master; file "/etc/namedb/master/localhost-reverse.db"; };
 zone "255.in-addr.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 
-// RFC 1912-style zone for IPv6 localhost address
+// RFC 1912-style zone for IPv6 localhost address (RFC 6303)
 zone "0.ip6.arpa"	{ type master; file "/etc/namedb/master/localhost-reverse.db"; };
 
-// "This" Network (RFCs 1912 and 5735)
+// "This" Network (RFCs 1912, 5735 and 6303)
 zone "0.in-addr.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 
-// Private Use Networks (RFCs 1918 and 5735)
+// Private Use Networks (RFCs 1918, 5735 and 6303)
 zone "10.in-addr.arpa"	   { type master; file "/etc/namedb/master/empty.db"; };
 zone "16.172.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 zone "17.172.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
@@ -153,18 +153,18 @@ zone "30.172.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 zone "31.172.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 zone "168.192.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 
-// Link-local/APIPA (RFCs 3927 and 5735)
+// Link-local/APIPA (RFCs 3927, 5735 and 6303)
 zone "254.169.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 
 // IETF protocol assignments (RFCs 5735 and 5736)
 zone "0.0.192.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 
-// TEST-NET-[1-3] for Documentation (RFCs 5735 and 5737)
+// TEST-NET-[1-3] for Documentation (RFCs 5735, 5737 and 6303)
 zone "2.0.192.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 zone "100.51.198.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 zone "113.0.203.in-addr.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 
-// IPv6 Range for Documentation (RFC 3849)
+// IPv6 Example Range for Documentation (RFCs 3849 and 6303)
 zone "8.b.d.0.1.0.0.2.ip6.arpa" { type master; file "/etc/namedb/master/empty.db"; };
 
 // Domain Names for Documentation and Testing (BCP 32)
@@ -231,17 +231,17 @@ zone "5.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 zone "6.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 zone "7.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 
-// IPv6 ULA (RFC 4193)
+// IPv6 ULA (RFCs 4193 and 6303)
 zone "c.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 zone "d.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 
-// IPv6 Link Local (RFC 4291)
+// IPv6 Link Local (RFCs 4291 and 6303)
 zone "8.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 zone "9.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 zone "a.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 zone "b.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 
-// IPv6 Deprecated Site-Local Addresses (RFC 3879)
+// IPv6 Deprecated Site-Local Addresses (RFCs 3879 and 6303)
 zone "c.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 zone "d.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };
 zone "e.e.f.ip6.arpa"	{ type master; file "/etc/namedb/master/empty.db"; };