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Old 11-30-2004, 11:33 AM   #1
Registered: Dec 2003
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Comcast Ips?

Anyone have a list of comcast's customers ips. 1/3 of spam hitting my email server is from comcast and I want to just firewall their entire ips off my server.

Old 11-30-2004, 11:55 AM   #2
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I don't know if you want to do that because Comcast's network is huge.

However, in the spirit of helping you out, I'm not sure of all their subnets but my IP on Comcast in New England is You could start with that..

Old 11-30-2004, 02:09 PM   #3
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Yes I know they are HUGE :P I have gotten hit from every ocean edge from various comcast ips. I'm fed up with it.

Thanks for the start. Any more ips?

Old 11-30-2004, 04:02 PM   #4
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24.0.*.* to 24.23.*.* I think are all registered to comcast. That would be a rather large chunk of spam.

In fact, the 24 block seems to be all sorts of isp's from rr to comcast to "mom and pop cable isp down in the south"

As well, a large chunk of 67.*.*.* is comcast. I think they begin around 67.150 or 67.160 and continue on upward. You might wanna check em. Just do a


and see if it comes back comcast.

You could check the 65.*.*.* block as well, that has some comcast iirc. maybe search google for 65 and comcast I dunno how you could check it.

Last edited by bdogg; 11-30-2004 at 04:07 PM.
Old 11-30-2004, 04:45 PM   #5
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As much spam as this school gets from comcast I just find it hard to believe noone has made a txt list of comcast ips to add to iptables.
Old 12-04-2004, 09:29 AM   #6
Registered: Sep 2003
Location: Springfield Ma.
Distribution: Mandrake 9.2,Knoppix 3.7,Slackware 10.0, FreeBSD. 5.3, OpenBSD 3.6, NetBSD 2.0, Debian
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Yea mine is 66.30. and I'm from northeast U.S. I agree they have a huge chunk of I.P.s


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