said by JoelC707 
:Nah the AT&T Broadband domain was attbi.com which coincidentally is still in use, check out this traceroute.
C:\Documents and Settings\jcleveland>tracert www.comcast.net
Tracing route to www.comcast.net [216.148.227.202]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 192.168.1.254
2 1 ms 1 ms <1 ms 72.17.248.153
3 14 ms 9 ms 9 ms 216-199-75-1.atl.fdn.com [216.199.75.1]
4 7 ms 9 ms 10 ms 216-199-64-233.atl.fdn.com [216.199.64.233]
5 8 ms 10 ms 9 ms border4.s7-11.fdn-2.acs.pnap.net [216.52.194.185]
6 17 ms 9 ms 10 ms core4.ge2-0-bbnet1.acs.pnap.net [64.94.0.6]
7 10 ms 9 ms 10 ms 12.118.184.141
8 65 ms 59 ms 61 ms gbr2-p70.attga.ip.att.net [12.123.197.190]
9 74 ms 71 ms 68 ms tbr2-p013602.attga.ip.att.net [12.122.12.37]
10 79 ms 69 ms 68 ms tbr1-cl13.dlstx.ip.att.net [12.122.2.89]
11 71 ms 82 ms 77 ms tbr1-cl20.la2ca.ip.att.net [12.122.10.50]
12 77 ms 70 ms 69 ms gar4-p300.la2ca.ip.att.net [12.123.222.89]
13 84 ms 79 ms 79 ms idf26-gsr12-1-pos-6-0.rwc1.attens.net [12.122.255.122]
14 83 ms 83 ms 85 ms rwcsbix11-1-6.attbi.com [63.241.85.238]
15 82 ms 79 ms 79 ms 192.168.64.2
16 84 ms 79 ms 79 ms www.comcast.net [216.148.227.202]
Trace complete.
Not only is attbi.com still in use (or at least there is a DNS server authoritative for it) they also used a private, non-routable address just before the server. Firewall maybe? Anyone know why or how they are doing that? I suspect the how is a simple static route but maybe not.
mostly what you are seeing in the traceroute is AT&T's IP backbone.. Major ISP's , like Comcast can purchase bandwidth from them.. usually large and expensive pipes.. tho I do see that one attbi.com IP.. guess it's either a recently bougth out system or they never bothered to change it.. either way they have their routers not configured correctly, as the 192.168.64.2 IP should not be visible at all in a traceroute like that..
