Just set up a nameserver for my reverse dns(ns.ph-is.de), and now I get this: $ dig +trace c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa ; <<>> DiG 9.2.4rc5 <<>> +trace c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa ;; global options: printcmd . 106998 IN NS C.ROOT-SERVERS.NET. . 106998 IN NS D.ROOT-SERVERS.NET. . 106998 IN NS E.ROOT-SERVERS.NET. . 106998 IN NS F.ROOT-SERVERS.NET. . 106998 IN NS G.ROOT-SERVERS.NET. . 106998 IN NS H.ROOT-SERVERS.NET. . 106998 IN NS I.ROOT-SERVERS.NET. . 106998 IN NS J.ROOT-SERVERS.NET. . 106998 IN NS K.ROOT-SERVERS.NET. . 106998 IN NS L.ROOT-SERVERS.NET. . 106998 IN NS M.ROOT-SERVERS.NET. . 106998 IN NS A.ROOT-SERVERS.NET. . 106998 IN NS B.ROOT-SERVERS.NET. ;; Received 436 bytes from 217.20.115.1#53(217.20.115.1) in 2 ms ip6.arpa. 172800 IN NS NS.RIPE.NET. ip6.arpa. 172800 IN NS NS.APNIC.NET. ip6.arpa. 172800 IN NS NS.ICANN.ORG. ip6.arpa. 172800 IN NS TINNIE.ARIN.NET. ;; Received 198 bytes from 192.33.4.12#53(C.ROOT-SERVERS.NET) in 105 ms 2.1.8.f.6.0.1.0.0.2.ip6.arpa. 43200 IN NS ns2.sixxs.net. 2.1.8.f.6.0.1.0.0.2.ip6.arpa. 43200 IN NS ns3.sixxs.net. 2.1.8.f.6.0.1.0.0.2.ip6.arpa. 43200 IN NS ns1.sixxs.net. ;; Received 113 bytes from 2001:610:240:0:53::193#53(NS.RIPE.NET) in 34 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604800 IN NS ns.ph-is.de. ;; Received 75 bytes from 2001:7b8:3:1e:290:27ff:fe0c:5c5e#53(ns2.sixxs.net) in 51 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 5 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 2 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 3 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 13 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 2 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. ;; Received 91 bytes from 62.80.105.196#53(ns.ph-is.de) in 1 ms c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa. 604597 IN NS ns.ph-is.de. dig: Too many lookups What's wrong with that? The zone looks like this: $TTL 86400 $ORIGIN c.c.2.1.8.f.6.0.1.0.0.2.ip6.arpa @INSOA ns1.ph-is.de. hostmaster.zakx.de. ( 1978022515; Serial 10800; Refresh 3600; Retry 2419200; Expire 604800 ); Default TTL IN NS ns1.ph-is.de. IN NS ns2.ph-is.de. IN NS ns3.ph-is.de. IN NS ns4.ph-is.de. 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR v6.zakx.de. Thanks in advance, Sven Gebhardt