Country
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ASN LANDING PAGE
AS33661
CMCS - Comcast Cable Communications, LLC
Last updated · Jul 20, 2026
Total prefixes
22
IPv4 prefixes
7
IPv6 prefixes
15
ASN summary
How to read the scale of AS33661
CMCS - Comcast Cable Communications, LLC currently reports 22 prefixes and 23 upstream, downstream, or peer relationships. These counts describe the current dataset; they do not by themselves prove network quality, reach, or service use.
What can an ASN page answer?
An ASN page shows the public organization label, country or region, BGP prefixes, and available peer and upstream relationships. It adds network context but cannot confirm a website host, physical facility, security status, or service quality.
How should you read the organization and region fields?
CMCS - Comcast Cable Communications, LLC is currently associated with an unknown region. These values come from public network sources and are useful lookup clues; an organization label, registration region, and actual service location may differ.
How should you verify the AS33661 result?
The page shows ASN data returned by the current upstream query; interpret it with the update time. Open representative IP pages from the same network and compare prefixes, source labels, and query times. Verify operator or service claims with the relevant registry or network operator.
How to verify this ASN result
AS33661 ASN lookupAS33661 BGPAS33661 peersAS33661 prefixesAS33661 upstreamsCMCS - Comcast Cable Communications, LLC ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
AS17035
AS17035
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AS54113
AS54113
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AS63402
AS63402
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AS26876
AS26876
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AS63264
AS63264
—
AS46576
AS46576
—
AS6931
AS6931
—
AS46999
AS46999
—
AS36040
AS36040
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AS54119
AS54119
—
AS36763
AS36763
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AS401671
AS401671
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AS396910
AS396910
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AS53937
AS53937
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AS30415
AS30415
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AS398641
AS398641
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AS395036
AS395036
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AS395659
AS395659
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AS396291
AS396291
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AS23542
AS23542
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AS398743
AS398743
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AS53445
AS53445
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Peers
Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 2001:559:135::/48 | AS33661 | — |
| 2001:559:4ed::/48 | AS33661 | — |
| 2001:559:4ee::/48 | AS33661 | — |
| 2001:559:731::/48 | AS33661 | — |
| 2001:559:830d::/48 | AS33661 | — |
| 2001:559:8320::/48 | AS33661 | — |
| 2001:559:8462::/48 | AS33661 | — |
| 2001:559:85d6::/48 | AS33661 | — |
| 2001:559:864f::/48 | AS33661 | — |
| 2001:559:878c::/48 | AS33661 | — |
| 2001:559:87d4::/48 | AS33661 | — |
| 2001:559:c202::/48 | AS33661 | — |
| 2001:559:c22b::/48 | AS33661 | — |
| 2001:559:c4b9::/48 | AS33661 | — |
| 2001:559:c4ea::/48 | AS33661 | — |
| 50.218.97.0/24 | AS33661 | — |
| 50.220.33.0/24 | AS33661 | — |
| 50.226.0.0/24 | AS33661 | — |
| 50.227.97.0/24 | AS33661 | — |
| 50.228.116.0/24 | AS33661 | — |
| 50.236.155.0/24 | AS33661 | — |
| 50.237.76.0/24 | AS33661 | — |
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Related lookups and next steps
Frequently asked questions about this ASN page
What does AS33661 represent?
AS33661 is an autonomous system number. The current source associates it with CMCS - Comcast Cable Communications, LLC and the region field an unknown region; those values add network context but do not prove a specific service, physical location, or quality level.
What are peers, upstreams, and prefixes useful for on the AS33661 page?
They help explain the scale, interconnection depth, and route structure of AS33661. Richer peering and upstream data often indicate broader network reach, but they should still be interpreted together with prefixes and related IP landing pages.
What should you do after reviewing AS33661?
Open a concrete IP page to check how the address maps into AS33661, then compare the prefix, source labels, and query time. Verify operator or service claims with the relevant registry or network operator.
Related topics
BGP and ASN Basics Guide
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Routing Troubleshooting and Network Analysis
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Cloud Network and ASN Comparison
Compare representative cloud and edge networks by ASN, announced prefixes, peers, upstreams, and downstreams without inferring a specific host or customer workload.