Slide 4 talks about Comcast's IP usage.
From: arin-ppml-bounces at arin.net [mailto:arin-ppml-bounces at arin.net] On
Behalf Of Leo Bicknell
Sent: Tuesday, November 09, 2010 8:01 AM
To: arin-ppml at arin.net
Subject: Re: [arin-ppml] Comcast
In a message written on Mon, Nov 08, 2010 at 08:49:27PM -0800, Ted
> Interesting, I didn't realize that they had all of their allocation
> under a single /9
They have more than one OrgID. Lots of the largest folks do, usually
the result of various mergers or operating companies.
They have several dozen blocks across a half dozen OrgID's, one of
them is a /8, 73/8, which was obtained from ARIN. Interestingly
it wasn't obtained all at once, when ARIN issued it they got a /10
and /9, IIRC, then later qualified for the other /10 to make it a
All together I would not be surprised that they had 3-4 /8's worth
of space if you added up all of their blocks. If you believe
http://en.wikipedia.org/wiki/Comcast they have around 16 million
high speed internet residential users. They do have other services
that eat IP's, for instance business users (not business cable,
actual GigE over fiber business users) who get larger blocks, and
some of their video and voice services also use IP's.
At a quick glance I don't see any significant blocks of legacy
space, I think they have gotten almost all of their space under
various ARIN policies.
Leo Bicknell - bicknell at ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/