it looks like ATT still answers the queries. I'd assume that any changes would have to be authorized by the customer though. Why not just call Siemens Medical? ; <<>> DiG 9.6.0-APPLE-P2 <<>> -x 12.54.91.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 21619 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;1.91.54.12.in-addr.arpa. IN PTR ;; AUTHORITY SECTION: 54.12.in-addr.arpa. 900 IN SOA xbru.br.ns.els-gms.att.net. rm-hostmaster.ems.att.com. 1179 86400 10000 600000 172800 2011/9/27 Mike Gatti <ekim.ittag@gmail.com>
Hello Nanog Members,
We have been having some issue doing reverse lookups for ip's in the 12.54.94.0/23 prefix. We know that this block is assigned to AT&T and AT&T has assigned that block to Siemens Medical (based on whois queries). We are now trying to find out who would be the authoritative DNS server that would resolve PTR queries for these IP addresses. Would someone from AT&T (or Siemens) or someone that has that info please contact me offline to discuss?
Thanks Everyone, -- Michael Gatti cell.949.735.5612 ekim.ittag@gmail.com (UTC-8)