We (at Kurchatov Insitute) still use 144.206.0.0/16, the legacy block, and seeing the breakage rooted at ARIN since this night, {{{ $ dig +trace -t soa 206.144.in-addr.arpa ; <<>> DiG 9.10.4-P6 <<>> +trace -t soa 206.144.in-addr.arpa ;; global options: +cmd . 206351 IN NS a.root-servers.net. . 206351 IN NS c.root-servers.net. . 206351 IN NS d.root-servers.net. . 206351 IN NS e.root-servers.net. . 206351 IN NS l.root-servers.net. . 206351 IN NS f.root-servers.net. . 206351 IN NS g.root-servers.net. . 206351 IN NS h.root-servers.net. . 206351 IN NS j.root-servers.net. . 206351 IN NS m.root-servers.net. . 206351 IN NS k.root-servers.net. . 206351 IN NS i.root-servers.net. . 206351 IN NS b.root-servers.net. . 514733 IN RRSIG NS 8 0 518400 20170329170000 20170316160000 61045 . OjsjoA6WCcThV3BqhAyMaXI3bU1m228Gl8nvaR074qBtem/RjaFJh1Oe r7LPI6W15jgbRGuCY7/GUNgDex4ZM43yvx2iY+2GpSk9b2/pKGbDaDIp X1Hd8418206eow1P/SgPqtT+2LzjM+lz/HKUvCyPoN4uX5/7GDExn8ir 2Q/vw81Za2nJ4Ji6oeGAmE8g6V3RJfTI0El/CP9Vl2/r0jWDZZ+wtYRA uwqvQYj+7VZc5+UJDJ3/Gne1LBnzXKnZRwnfJtZenhfZ7X20D9PiXvfJ M2s1ryqZvg8K5RqYt/r8pIiq1Udd1KWQBgdN7Q629+jNSngZQtH19R9H fM7h1w== ;; Received 1097 bytes from 127.0.0.1#53(127.0.0.1) in 0 ms in-addr.arpa. 172800 IN NS e.in-addr-servers.arpa. in-addr.arpa. 172800 IN NS f.in-addr-servers.arpa. in-addr.arpa. 172800 IN NS d.in-addr-servers.arpa. in-addr.arpa. 172800 IN NS c.in-addr-servers.arpa. in-addr.arpa. 172800 IN NS b.in-addr-servers.arpa. in-addr.arpa. 172800 IN NS a.in-addr-servers.arpa. in-addr.arpa. 86400 IN DS 53696 8 2 13E5501C56B20394DA921B51412D48B7089C5EB6957A7C58553C4D4D 424F04DF in-addr.arpa. 86400 IN DS 63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D0 30733C73 in-addr.arpa. 86400 IN DS 47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F2 81CBC6F2 in-addr.arpa. 86400 IN RRSIG DS 8 2 86400 20170330000000 20170316230000 33786 arpa. gqNN6MmLVxFtSG0oxdyoYVSXZlp6vY9yxpnJW89TYCHfTkv+ZmklM76O IHdTznEhLHXbyr4BaxjFCshsC3WacdH/YZYa/SZynJ9Q1N6/bogrIUTn qs61Y/YD4Sk5lI7YvUxVnPrF3lk1pY8dpoTkprTLZngoeQEsm552inqG ypU= ;; Received 733 bytes from 198.41.0.4#53(a.root-servers.net) in 64 ms 144.in-addr.arpa. 86400 IN NS r.arin.net. 144.in-addr.arpa. 86400 IN NS u.arin.net. 144.in-addr.arpa. 86400 IN NS x.arin.net. 144.in-addr.arpa. 86400 IN NS y.arin.net. 144.in-addr.arpa. 86400 IN NS z.arin.net. 144.in-addr.arpa. 86400 IN NS arin.authdns.ripe.net. 144.in-addr.arpa. 86400 IN DS 62856 5 1 484154736CF9D4DC4F1C2B807BDC06E5B1645AFF 144.in-addr.arpa. 86400 IN RRSIG DS 8 3 86400 20170328085556 20170307105911 4341 in-addr.arpa. X3nPKgjQbRef6BxK3msEXi/IcfpG1rylY2xeWwfNO6fJB5x/QT38ZCA5 XMs6CBeXb59tpQFbgjwZX+prqSpjGFtZ+phFuzsaGmuPOF0FFypMHj7F swykEFvaPY5z4d8mo9FKFJetF2gZfzYthwJWW0x2oo2H2BG0lEedVUCb 1aGs/HE= ;; Received 380 bytes from 193.0.9.1#53(f.in-addr-servers.arpa) in 48 ms 144.in-addr.arpa. 0 IN SOA z.arin.net. dns-ops.arin.net. 2017022432 1800 900 691200 10800 144.in-addr.arpa. 0 IN RRSIG SOA 5 3 86400 20170331083220 20170317073220 33345 144.in-addr.arpa. k2sZXuQQR3MyyRiB9Wd7fw45yZTbNokjQtFFNY+aCEa/85AnSyuomLlZ jZs4A0bO376/Z1v+bTHoeFqsyHr/xuWHX74r0QC/TCeP0amc+w8RqCvw Yox1TfoJxwhblGNRCgyLw52WszMYyr49EfWPfpHAKFU+G94gdilf3C6x GOM= 144.in-addr.arpa. 10800 IN NSEC 0.144.in-addr.arpa. NS SOA RRSIG NSEC DNSKEY 144.in-addr.arpa. 10800 IN RRSIG NSEC 5 3 10800 20170331083220 20170317073220 33345 144.in-addr.arpa. opvG8SC7+UjHSTtBBtekWNkhLFMIxFxOdejJ7sM7t8lyGNzM6sOABeSI ADXfo8q3p4YFBHgBU5fRCAhBdiQ/AiZC0dLMnHb4WdKEv5bDsBbq5Pt6 vabJaIv7Gizw7kBy1JZ/ZrC4Jmp4EX0HiYA+Ak+aQggD7gdI/6tFDNpl N7M= 205.144.in-addr.arpa. 10800 IN NSEC 207.144.in-addr.arpa. NS RRSIG NSEC 205.144.in-addr.arpa. 10800 IN RRSIG NSEC 5 4 10800 20170331083220 20170317073220 33345 144.in-addr.arpa. F1e5mA7C3Mx10YSaNtshzfzfER8pudDOQkUoe+jeDhHeDZeR8FM1FoqW dqrNh5X6JVNlTdWGio6evnSkxnaoJFYyeYJtc+tJ8dTd5APJxJCSOfhH VfRNy7VHs2PdElRo1rRwMw+5Zncc0u8uPdmFDv2ZG8Vv3zj5C6l7rMla 3SA= ;; Received 718 bytes from 199.212.0.63#53(z.arin.net) in 128 ms }}} Seems like the other /16 from 144.in-addr.arpa are affected too (at least). ARIN tickets are engaged, but I am seeking some live person: having the whole reverse zone being unavailable isn't the stuff that is to be handled in 5x8 or alike. If anybody knows what happened, can point me to my errors in assertions or give an e-mail/phone of 24x7-like person or service at ARIN -- will be tremendous. Thanks! -- Eygene Ryabinkin, National Research Centre "Kurchatov Institute" Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live.