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All FAQs » Comcast High Speed Internet FAQ » 3.1 Advanced Topics

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What ports does Comcast block?

Comcast currently blocks ports 25, 68, 135-139, 445, 520, and 1080.

It is questionable whether some of these ports are presently blocked.
See this topic: Blocked ports

Also, see this Comcast FAQ link.

*This FAQ is based on user knowledge from a volunteer core of BroadbandReports' members. This FAQ in no way constitutes official information from Comcast or any of its affiliates.


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Comcast also redirects UDP port 53 to their own DNS servers.

2012-04-14 19:17:29


by Big_D See Profile edited by Johkal See Profile
last modified: 2010-04-08 18:48:22


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