Welcome to Comcast DNS

This site provides you with the Comcast DNS server status, IP addresses, and troubleshooting tools. As part of our ongoing efforts to protect our customers and provide great security features, DNSSEC validation is now included as part of Comcast Constant Guard™ from Xfinity.

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Video Interview on Negative Trust Anchors

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Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
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on April 01, 2013
in DNSSEC News

Check out this video interview on Negative Trust Anchors "NTAs" for domains failing DNSSEC validation: http://www.youtube.com/watch?v=AattVxfFmNo

Tags: DNSSEC

sangitacpatelmd.com Failing DNSSEC Validation

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Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
User is currently offline
on March 21, 2013
in DNSSEC News

The domain sangitacpatelmd.com is currently failing DNSSEC validation. This is because the domain has published DS records, but no DNSKEY or RRSIG records. The domain owners have been contacted and made aware of the issue. The DNSViz report of this failure can be found at http://dnsviz.net/d/sangitacpatelmd.com/UUrU2Q/dnssec/.

Tags: DNSSEC

teamtony.org Failing DNSSEC Validation

Posted by Comcast
Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
User is currently offline
on March 20, 2013
in DNSSEC News

The domain teamtony.org is currently failing DNSSEC validation. This is because the domain has published DS records, but no DNSKEY or RRSIG records. The domain owners have been contacted and made aware of the issue. The DNSViz report of this failure can be found at http://dnsviz.net/d/teamtony.org/UUoL3A/dnssec/.

Tags: DNSSEC

eeoc.gov Failing DNSSEC Validation (Fixed)

Posted by Comcast
Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
User is currently offline
on March 19, 2013
in DNSSEC News

The domain eeoc.gov has been failing DNSSEC validation. This was because the RRSIGs covering the domain records had expired. The domain owners corrected the issue and informed us. We have flushed our cache for these records to speed resolution. The DNSViz report at the time of this failure can be found at http://dnsviz.net/d/eeoc.gov/UUidFg/dnssec/.

Tags: DNSSEC

coffeecupmonument.com Failing DNSSEC Validation

Posted by Comcast
Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
User is currently offline
on March 11, 2013
in DNSSEC News

The domain coffeecupmonument.com is currently failing DNSSEC validation. This is because there are published DS records, but no corresponding DNSKEY records. The domain owners have been contacted and made aware of the issue. The DNSViz report of this failure can be found at http://dnsviz.net/d/coffeecupmonument.com/UT3dOQ/dnssec/.

Tags: DNSSEC

uspto.gov Failing DNSSEC Validation

Posted by Comcast
Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
User is currently offline
on March 01, 2013
in DNSSEC News

The domain uspto.gov is currently failing DNSSEC validation. This is because the RRSIGs covering the domain have expired. The domain owners have been contacted and made aware of the issue. The DNSViz report of this failure can be found at http://dnsviz.net/d/uspto.gov/UTEOsQ/dnssec/.

Tags: DNSSEC

ul.pt Unreachable

Posted by Comcast
Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
User is currently offline
on March 01, 2013
in DNSSEC News

The domain ul.pt is currently unreachable on DNSSEC enforcing resolvers. This is because the return size of the lookup with DNSSEC records is larger than the path MTU of the domain. The domain owners have been contacted and made aware of the issue. The DNSViz report of this failure can be found at http://dnsviz.net/d/ul.pt/UTC7WQ/dnssec/.

Tags: DNSSEC

mausandhoffman.com Failing DNSSEC Validation

Posted by Comcast
Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
User is currently offline
on February 21, 2013
in DNSSEC News

The domain mausandhoffman.com is currently failing DNSSEC validation. This is because the DS records published do not correspond to any DNSKEYs in the domain. The domain owners have been contacted and made aware of the issue. The DNSViz report of this failure can be found at http://dnsviz.net/d/www.mausandhoffman.com/USaT8g/dnssec/.

Tags: DNSSEC

nsopw.gov Failing DNSSEC Validation

Posted by Comcast
Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
User is currently offline
on February 14, 2013
in DNSSEC News

The domain nsopw.gov is currently failing DNSSEC validation. This is because the domain was signed by DNSKEYs that do not correspond to the DS records in parent domain (.gov). The domain owners have been contacted and made aware of the issue. The DNSViz report of this failure can be found at http://dnsviz.net/d/nsopw.gov/URwiqQ/dnssec/

Tags: DNSSEC

www.clinicaltrials.gov Failing DNSSEC Validation

Posted by Comcast
Comcast
Comcast Corporation (Nasdaq: CMCSA, CMCSK) (www.comcast.com) is one of the world’s leading media, entertainmen...
User is currently offline
on February 13, 2013
in DNSSEC News

The domain www.clinicaltrials.gov is currently failing DNSSEC validation in some areas. This is because the domain rolled it's keys and the old ones are still cached. The domain owners contacted us to make us aware of the issue. We will be flushing the platform and resolution should resume shortly.

Tags: DNSSEC
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