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Hi, Radoslav.

] i'm wondering how you find out that IP range belongs to AT&T even to
] someone you call AS7018 ?

It helps to query the correct RIR.  ;)

] * irc.ridernet.org:6667
] * 12.205.151.144:6667

   whois -h whois.arin.net 12.205.151.144
   AT&T WorldNet Services ATT (NET-12-0-0-0-1)
                                  12.0.0.0 - 12.255.255.255
   Mediacom Communications Corp MEDIACOMCC-12-205-148-0-CEDAR-RAPIDS-IA
   (NET-12-205-148-0-1)
                                  12.205.148.0 - 12.205.151.255

The RIPE NCC would of course have no data on this IP, since it is
a direct allocation to a North American corporation, AT&T.

   <http://www.iana.org/assignments/ipv4-address-space>
   [ ... ]
   012/8   Jun 95   AT&T Bell Laboratories
   [ ... ]

You can also use the Team Cymru IP2ASN whois server for a view of
the origin ASN based on real-time updates from 50+ peers.

   whois -h whois.cymru.com  12.205.151.144
   AS      | IP               | AS Name
   7018    | 12.205.151.144   | ATT-INTERNET4 - AT_T WorldNet

But who is AS7018?  Why do I call them that?  Well, that's the origin
ASN of this IP (see above), and is also in ARIN's whois data:

   whois -h whois.arin.net 12.205.151.144
   [ ... ]
   OrgName:    AT&T WorldNet Services
   OrgID:      ATTW
   Address:    AT&T
   Address:    200 S. LAUREL AVE.
   City:       MIDDLETOWN
   StateProv:  NJ
   PostalCode: 07748
   Country:    US
   [ ... ]

So the IP 12.205.151.144, included in your initial note, is routed
by AS7018 AT&T and SWIP'd to Mediacom Communications.

Thanks,
Rob.
-- 
Rob Thomas
Team Cymru
http://www.cymru.com/
ASSERT(coffee != empty);

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