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 <[email protected]> > 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 > [email protected] > (UTC-8) > > > > > >
