AS33657 · US — CMCS - Comcast Cable Communications, LLC

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CMCS - Comcast Cable Communications, LLC · · US

Identity source

AS33657 ·

US CMCS - Comcast Cable Communications, LLC

NRO allocation data

29IPv4 prefixes

240IPv6 prefixes

81Observed neighbors

RPKIValid: 262 Invalid: 2 Not found: 5 Unknown: 0

Selected local snapshot coverage; not the whole Internet. BGP snapshots: ris-rrc00 11 Oct 00:00 UTC; routeviews2 11 Oct 02:00 UTC; routeviews6 11 Oct 02:00 UTC. Validator: 11 Oct 04:01 UTC. Publication-point issues: 89

Address space details

Overlapping originated prefixes counted once. IPv4 addresses: 11,520

IPv6 addresses: 290142196707511001929482240

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Observed originated prefixes

These are observed BGP origins, not an inventory of registered allocations or transit reachability.

269 matching prefix–origin pairs. Each pair appears once; source observations are in Details.

Prefix	RPKI	Last observed	Details
50.201.252.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.202.117.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.202.155.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.203.251.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.204.116.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.204.128.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.205.74.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.207.162.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.216.214.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.218.16.0/24	Invalid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI invalid Validation evidence origin ASN mismatch { "state": "invalid", "reason": "origin ASN mismatch", "observed_at": "2026-10-11T04:01:07.167884+00:00", "source": "Local Routinator", "metadata": { "rows": 1018606, "serial": 41, "version": "routinator/0.15.2", "publication_point_issues": 89 }, "vrps": [ { "prefix": "50.218.16.0/24", "asn": 33659, "max_length": 24, "trust_anchor": "arin" }, { "prefix": "50.128.0.0/9", "asn": 7922, "max_length": 9, "trust_anchor": "arin" } ] }
50.219.87.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.223.158.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.223.159.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.224.212.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.226.61.0/24	Invalid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI invalid Validation evidence origin ASN mismatch { "state": "invalid", "reason": "origin ASN mismatch", "observed_at": "2026-10-11T04:01:07.167884+00:00", "source": "Local Routinator", "metadata": { "rows": 1018606, "serial": 41, "version": "routinator/0.15.2", "publication_point_issues": 89 }, "vrps": [ { "prefix": "50.128.0.0/9", "asn": 7922, "max_length": 9, "trust_anchor": "arin" }, { "prefix": "50.226.61.0/24", "asn": 33659, "max_length": 24, "trust_anchor": "arin" } ] }
50.232.109.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.232.173.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.232.184.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.235.98.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.235.236.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.236.38.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.236.234.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.238.163.0/24	Valid	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
69.67.80.0/20	Not Found	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI not_found
76.78.2.0/24	Not Found	11 Oct 02:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI not_found

Next rows

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Observed AS neighbors

81 unique neighbors in the selected local snapshots. This is the available collector dataset, not a complete map of the Internet. Adjacency does not establish upstream service or peering.

81 matching neighbors · 1–25 shown

Network	IPv4/IPv6	Seen in	Last observed	Details
AS1358 · US HNSNET-AS - Hughes Network Systems, LLC	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS2384 · US AOCNET - Architect of the Capitol	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS2703 · Registration country unavailable -Reserved AS-	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS3356 · US Level 3 Parent, LLC	IPv6	ris-rrc00	11 Oct 00:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC
AS3573 · US Accenture LLP	IPv6	ris-rrc00, routeviews6	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 02:00 UTC
AS3705 · US GPO-NET - U.S. Government Publishing Office	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS4880 · US LIFELINE-ASN - Lifeline Systems, Company	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS5721 · US NDU-NET - National Defense University	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS7922 · US Comcast Cable Communications, LLC	IPv4, IPv6	ris-rrc00, routeviews2, routeviews6	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 02:00 UTC
AS10918 · US ACCURANT - Accurant Cloud Services LLC	IPv4, IPv6	ris-rrc00, routeviews2, routeviews6	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 02:00 UTC
AS11790 · US RANDOMHOUSE - Random House, Inc.	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS11951 · US MCSP - Medical Computer Systems	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS12222 · US AKAMAI - Akamai Technologies, Inc.	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS12245 · US PRMC-ASN - Peninsula Regional Medical Center	IPv4	routeviews2	11 Oct 02:00 UTC	Source observations routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS13511 · US Univision Communications Inc.	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS14036 · US STACKAV-01 - Stack AV	IPv4	routeviews2	11 Oct 02:00 UTC	Source observations routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS14246 · US THALESCOMMINC-AS - Thales Communications Inc.	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS15134 · US PWCSA - Prince William County Service Authority	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS16463 · US DPSINET - Data Processing Solutions, Inc.	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS16881 · US DAVID-C-PRALL-INTERNET - Prall, Inc., David C	IPv4, IPv6	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC ris-rrc00 · IPv6 · 11 Oct 00:00 UTC
AS17035 · US NBCUNI-17035 - NBCUniversal	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS17190 · US ASN17190 - Washington Metropolitan Area Transit Authority	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS19316 · US QUADRANGLE - Quadrangle Development Corporation	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS19320 · US FLEX-WDF - Flextronics International USA, Inc.	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS19936 · US GORDONFOODS - Gordon Food Service	IPv4	ris-rrc00, routeviews2	11 Oct 02:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 02:00 UTC

Next neighbors

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View observed neighbor graph (up to 15 AS nodes)

Lines mean observed adjacency, with no commercial direction inferred. The table above provides the same evidence and source times.

Showing 14 of 81 matching neighbors, in table sort order, independent of table page.

Peering & locations

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Registry information

No cached registry response is available yet. Routing origins above are not a substitute for registry ownership.

Allocation statistics

NRO/RIR delegated-extended records describe allocation or assignment ranges. They do not prove a BGP announcement or replace more-specific RDAP registration information. Country is the allocation record’s registration country, not the physical location of every address.

AS33657–AS33657 · arin · assigned · ASN allocation country: US · Allocation date: 2005-02-16 — NRO/RIR data · snapshot 10 Oct 00:00 UTC

NRO data and format

Prefix count history

Local observation changes

Only comparable successful snapshots are compared. First imports, changed peer coverage and collection gaps are baselines, not new global routes or withdrawals. RPKI transition history is not available before it has been recorded.

No retained changes are available for this resource.

Retained local prefix-count observations

Separate collector series. Missing rows are not zero. Peer-set changes are separate coverage, not a continuous trend.

Source	Snapshot	Family	Prefixes	Peer coverage
routeviews2	11 Oct 02:00 UTC	IPv4	29	140.192.8.16/IPv4
routeviews6	11 Oct 02:00 UTC	IPv6	240	2406:840:feed:2::1/IPv6
routeviews2	11 Oct 00:00 UTC	IPv4	29	140.192.8.16/IPv4
ris-rrc00	11 Oct 00:00 UTC	IPv6	240	2a00:5884::6/IPv6, 89.234.186.6/IPv4
routeviews6	11 Oct 00:00 UTC	IPv6	240	2406:840:feed:2::1/IPv6
ris-rrc00	11 Oct 00:00 UTC	IPv4	27	2a00:5884::6/IPv6, 89.234.186.6/IPv4
ris-rrc00	10 Oct 16:00 UTC	IPv4	27	2a00:5884::6/IPv6, 89.234.186.6/IPv4
ris-rrc00	10 Oct 16:00 UTC	IPv6	240	2a00:5884::6/IPv6, 89.234.186.6/IPv4