Authoritative DNS server for 12.54.94.0/23 PTR

Tue Sep 27 20:06:59 UTC 2011

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 at 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 at gmail.com
> (UTC-8)
>
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