Tag Archives: Comcast

Charter, Comcast, and Windstream got worse in December 2013 SpamRankings.net

Road Runner (Time Warner Cable) had four of the U.S. U.S. top 10 for December 2013, adding up to more spam spewed than #1 Charter and way more than #2 Comcast.

Two out of three of Road Runner’s entries got worse, and one, AS11427 SCRR-11427, popped up from #27 to join the top 10 at #9.

PaeTec (Windstream) popped up from #45 to #3 with one week’s burst of spam.

Internap‘s AS12180 INTERNAP-2BLK dropped out of the top 10, plummetting from more than 5 million spam messages in November to none observed in the CBL data in December. Congratulations, Internap! Continuum Data Centers’ AS53264 CDC-LMB1 also did well, dropping from #10 to #57, down from 1.5 million to 0.25 million spam messages.


Comcast’s AS 7015 and AS 7922

Comcast shows some of the biggest differences between Version 2 and the old version 1 of SpamRankings.net for April 2013. Comcast is in the U.S. top 10 either way, but with different Autonomous Systems: AS 7922 is #3 in v2 while AS 7015 of Comcast Cable Communications Holdings Inc is #8 in v1 and doesn’t even appear in the v2 top 250.

AS 7015AS 7922netblocks assigned
#3v2 rank
#8#107v1 rank

Interesting tidbit from Bloomberg Business Week about Comcast Cable Communications Holdings Inc: Continue reading

Global Crossing spammed the most from the U.S. in September 2012 SpamRankings.net!

Bar chart: September 2012 U.S. spamRankings.net from CBL Volume Winner and new champion: Global Crossing’s AS 3549 GBLX! GBLX won the September 2012 SpamRankings.net with almost half of all the spam from the top 10 seen in the CBL data and more than a third seen from PSBL. What accounts for this surge of U.S. spammy ASNs?

Top 10 botnets for top 10 ASNs, U.S., Sep 2012, SpamRankings.net

Pie chart: September 2012 U.S. spamRankings.net from CBL Volume Yep, it’s Festi for #1 GBLX, #2 AS 17184 ATL-CBEYOND, for #3 AS 7018 ATT-INTERNET4, #8 AS 7385 INTEGRATELECOM and #10 AS 1239 SPRINTLINK. Congratulations AT&T for making the list! Well, not really congratulations, since it means you let a lot of outbound spam out.

However, it’s Lethic for #4 AS 8047 GCI, #5 AS 22258 COMCAST-22258, and #6 AS 20115 CHARTER-NET-HKY-NC.

Line chart: September 2012 U.S. spamRankings.net from CBL Volume AS 3549 GBLX may have already peaked. AS 19529 RAZOR-PHL went up like a rocket at the end of the month! Will they swap ranks next month? And what’s driving RAZOR-PHL to the top? Hint: it’s the same as for #9 AS 25653 FORTRESSITX. Stay tuned!


Comcast pushed out of first, yet wins November U.S. SpamRankings.net

How can an ISP both lose and win in top 10 rankings? By placing more than once!

Comcast got pushed out of first place by AS 46475 LIMESTONENETWORKS and AS 21788 NOC in the November 2011 Monthly U.S. SpamRankings.net from CBL volume. AS 20214 COMCAST-20214 did spam a third less (1,503,173 spam messages) than last month (2,193,898), but it was the spontaneous spam spewing of the two top place newcomers that pushed it down to third place.

Yet Comcast really won the month. It took 4 of the top 10 (places 3, 6, 7, and 10), which is twice as many as last time, and accounted for 30.29% of top 10 spam spewed, up from 23.9% last time. That percentage beats either of the top two this time.