RDNS seems to be broken for 2001:1291:200:82fe::/64. dig +trace e.f.2.8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa ; <<>> DiG 9.9.1-P1 <<>> +trace e.f.2.8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa ;; global options: +cmd . 21988 IN NS i.root-servers.net. . 21988 IN NS b.root-servers.net. . 21988 IN NS g.root-servers.net. . 21988 IN NS m.root-servers.net. . 21988 IN NS l.root-servers.net. . 21988 IN NS c.root-servers.net. . 21988 IN NS d.root-servers.net. . 21988 IN NS j.root-servers.net. . 21988 IN NS f.root-servers.net. . 21988 IN NS a.root-servers.net. . 21988 IN NS h.root-servers.net. . 21988 IN NS k.root-servers.net. . 21988 IN NS e.root-servers.net. . 32155 IN RRSIG NS 8 0 518400 20120625000000 20120617230000 56158 . oa9jUlFbXLR3FU05wxB4+2e3ZhMe1odaWi5nekJhWss188PR2mAz65FY 1utjEdmxxjCjUS9FgAckwlPRUrFRW/Z2MJ1DQvUAUP1wNJGMShbMdG1T 3NXmq5U3IwtyVMr4ocMWK11JBwb30nALyhBy4svll29fc4HAilHj4xmR cic= ;; Received 857 bytes from 192.168.7.1#53(192.168.7.1) in 22 ms ip6.arpa. 172800 IN NS a.ip6-servers.arpa. ip6.arpa. 172800 IN NS d.ip6-servers.arpa. ip6.arpa. 172800 IN NS b.ip6-servers.arpa. ip6.arpa. 172800 IN NS e.ip6-servers.arpa. ip6.arpa. 172800 IN NS f.ip6-servers.arpa. ip6.arpa. 172800 IN NS c.ip6-servers.arpa. ip6.arpa. 86400 IN DS 13880 8 2 068554EFCB5861F42AF93EF8E79C442A86C16FC5652E6B6D2419ED52 7F344D17 ip6.arpa. 86400 IN RRSIG DS 8 2 86400 20120625000000 20120617230000 56934 arpa. FWhQJ9TyeHSt/ZNdGb64EElydYN5HZHB3fJ/c7VvWv5//8fYmbxYUpei /1e6pwsgGGpjdqK4YBmva1XF24HgKYSeG9ojALbdwz3XEsfuGFaqNol/ Z5lhZr8/Js9Y5yp6py63Zt7g4EOG+o4wCGpohVYmsQ/S7DBRtRggR/Ik CDE= ;; Received 653 bytes from 192.228.79.201#53(192.228.79.201) in 211 ms 2.1.1.0.0.2.ip6.arpa. 86400 IN NS ns.lacnic.net. 2.1.1.0.0.2.ip6.arpa. 86400 IN NS ns2.dns.br. 2.1.1.0.0.2.ip6.arpa. 86400 IN NS ns2.lacnic.net. 2.1.1.0.0.2.ip6.arpa. 86400 IN NS ns3.afrinic.net. 2.1.1.0.0.2.ip6.arpa. 86400 IN NS sec1.authdns.ripe.net. 2.1.1.0.0.2.ip6.arpa. 86400 IN NS sec3.apnic.net. 2.1.1.0.0.2.ip6.arpa. 86400 IN NS tinnie.arin.net. 2.1.1.0.0.2.ip6.arpa. 86400 IN NS ns-lacnic.nic.mx. 2.1.1.0.0.2.ip6.arpa. 3600 IN NSEC 3.1.1.0.0.2.ip6.arpa. NS RRSIG NSEC 2.1.1.0.0.2.ip6.arpa. 3600 IN RRSIG NSEC 8 8 3600 20120626111055 20120619003045 24993 ip6.arpa. LXljgL9LzXi2mRGOMqE0FxHAkazywtBCCduFejp37GAFDmQsVxaKpXdo 3pq2UoG4aIukhZLsVFOJmd+thTwm+91dA2ggJ51L4ZWNY9cQjXJrC49k 8Z30tecJCyXIoRwXOEpE3CqSMyYh846RyplSqsK1PM2IeLcf+s+VGQkm /Ow= ;; Received 507 bytes from 2001:43f8:110::11#53(2001:43f8:110::11) in 563 ms 1.9.2.1.1.0.0.2.ip6.arpa. 86400 IN NS nssar.ctbc.com.br. 1.9.2.1.1.0.0.2.ip6.arpa. 86400 IN NS nspar.ctbc.com.br. ;; Received 120 bytes from 202.12.28.140#53(202.12.28.140) in 378 ms 2.0.1.9.2.1.1.0.0.2.ip6.arpa. 54000 IN NS ns3.sixxs.net. 2.0.1.9.2.1.1.0.0.2.ip6.arpa. 54000 IN NS ns1.sixxs.net. 2.0.1.9.2.1.1.0.0.2.ip6.arpa. 54000 IN NS ns2.sixxs.net. ;; Received 132 bytes from 201.48.254.57#53(201.48.254.57) in 59 ms sisag51pffrt1g4jmf4prq0o68b2jbmc.8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. 604800 IN NSEC3 1 1 100 9F35C8672C59FF3D 77MAPSF533I3IQ73DDIR4JB5HOPBFMUH NS SOA TXT RRSIG DNSKEY NSEC3PARAM sisag51pffrt1g4jmf4prq0o68b2jbmc.8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. 604800 IN RRSIG NSEC3 8 16 604800 20120715230004 20120615230004 10611 8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. fYvx6FxCAULMW4XchyGbgwbacpsj1LBt8K4COwaJOdYvyVYk1uCaOoOi vYkBYSPeHhN02lQvvN1qL9WvNK8nR00wBgH13L1O2FY0eXm+7u02HVVL DAHAzp5kMSaE8Eh7qBibvrINfgTbIQJWiPfy/Y0IQx8V/WsFmJ2j6u9M RA4= sisag51pffrt1g4jmf4prq0o68b2jbmc.8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. 604800 IN RRSIG NSEC3 8 16 604800 20120715230004 20120615230004 27036 8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. uvEzkCGz5mS9D9bqlgZgSuVTXwawvfmW1kvpEGByKzqZd5JGX2r7/8eg 5G+zPTYeKWx57uKah94rA+3D9mIQ/VgcyNRiMAGsbufujDJz3ZR2xUPE 8vytEdyrE4x2ab3hxHN/nJoIsFxHN+PiFUyDPpaT4S2GEbXEFH61P0yD NpM= 77mapsf533i3iq73ddir4jb5hopbfmuh.8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. 604800 IN NSEC3 1 1 100 9F35C8672C59FF3D SISAG51PFFRT1G4JMF4PRQ0O68B2JBMC TXT RRSIG 77mapsf533i3iq73ddir4jb5hopbfmuh.8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. 604800 IN RRSIG NSEC3 8 16 604800 20120715230004 20120615230004 10611 8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. Fq+HjDJPcXJn62EGZj3l+ghMr/4V553hNRJkU0BlC3ZpkLz/VNXiEK3Q DAPCi2Fxa4YqjROOLjM4oCMYcC3Oql60301sv6XupIx6Kvlfte52G4eL w/FkwZgld/xMd7a/6ya9CffCgv736ZS4s8CPVKdPavyWsBnKKmpEwmvp bMw= 77mapsf533i3iq73ddir4jb5hopbfmuh.8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. 604800 IN RRSIG NSEC3 8 16 604800 20120715230004 20120615230004 27036 8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. UGfyaCGF89ATGivgSCOItAP80/lsdldbRoRF7G3LSHLkuqH22/HbKChi i9id3fYbzGqrNK5EKJFFijmVgmiquK1TuP/Ot4TIT92yBZK7CnGNP+pr wRZNbNCExU53gv3a22XE0h4VXq1IJQfdNuCclwbpcEPEMjH383hm6NKQ /PU= 8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. 604800 IN SOA localhost. hostmaster.sixxs.net. 2012061602 10800 3600 2419200 604800 8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. 604800 IN RRSIG SOA 8 15 604800 20120715230004 20120615230004 10611 8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. smrM/MdP6qxYjl7XJKWPRFHWEDb9kxpBm9nSTMvWPmicCTKwA1XXVsPE YsrE4q9M5LU68aqLXc3dJbQ5NZHddbabX18ZDtbtIWInttOADmV6JsJ/ WgWVW+eExmirR4KcaKRLfAqZ3DuiqBXRyOpJEvF+Dy/NblvEwfi9Zvf+ Xd0= 8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. 604800 IN RRSIG SOA 8 15 604800 20120715230004 20120615230004 27036 8.0.0.2.0.1.9.2.1.1.0.0.2.ip6.arpa. XJ/qWcF99WDItukorCjh5YinhyCzO6CcSxiEO2bf3A1IkIbVgsP9eK9m kEdcYck7f55fESVTcRFXMQyXOHcRd7bDV/wMUW+sRtqY+mq6FzztXUPW 7ecyRx8DFHWZaHJFOzmgloBtvCXIS3B7+ykAJ2GFzbaLttrU/0bihxfS rvk= ;; Received 1507 bytes from 38.229.76.3#53(38.229.76.3) in 222 ms