AS33657 · US — Comcast Cable Communications, LLC

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CMCS · ARIN · US

Identity source

AS33657 ·

US 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 06:00 UTC; routeviews6 11 Oct 04:00 UTC. Validator: 11 Oct 06:22 UTC. Publication-point issues: 90

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 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.202.117.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.202.155.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.203.251.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.204.116.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.204.128.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.205.74.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.207.162.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.216.214.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.218.16.0/24	Invalid	11 Oct 06:00 UTC	1 source observations routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI invalid Validation evidence origin ASN mismatch { "state": "invalid", "reason": "origin ASN mismatch", "observed_at": "2026-10-11T06:22:51.779054+00:00", "source": "Local Routinator", "metadata": { "rows": 1018603, "serial": 48, "version": "routinator/0.15.2", "publication_point_issues": 90 }, "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 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.223.158.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.223.159.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.224.212.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.226.61.0/24	Invalid	11 Oct 06:00 UTC	1 source observations routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI invalid Validation evidence origin ASN mismatch { "state": "invalid", "reason": "origin ASN mismatch", "observed_at": "2026-10-11T06:22:51.779054+00:00", "source": "Local Routinator", "metadata": { "rows": 1018603, "serial": 48, "version": "routinator/0.15.2", "publication_point_issues": 90 }, "vrps": [ { "prefix": "50.226.61.0/24", "asn": 33659, "max_length": 24, "trust_anchor": "arin" }, { "prefix": "50.128.0.0/9", "asn": 7922, "max_length": 9, "trust_anchor": "arin" } ] }
50.232.109.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.232.173.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.232.184.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.235.98.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.235.236.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.236.38.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.236.234.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
50.238.163.0/24	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
69.67.80.0/20	Not Found	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI not_found
76.78.2.0/24	Not Found	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI not_found routeviews2 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI not_found

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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 · 26–50 shown

Network	IPv4/IPv6	Seen in	Last observed	Details
AS20137 · US USAGM-LAN - USAGM	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS21683 · US DALKO-NETWORKS - Dalko, LLC	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS22101 · US CPIL-ASN - Cyber Point International, LLC	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS22593 · US BCBSNC-AS - Blue Cross and Blue Shield of North Carolina	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS22694 · US CNBC - NBCUniversal	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS22815 · US KELLY-INSURANCE-GROUP - Kelly and Associates Insurance Group	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS22962 · US KENNEDY-NW-DC-US - The Kennedy Center	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS25696 · Registration country unavailable -Reserved AS-	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS25716 · US INGERSOLL-RAND - Trane Technologies Company LLC	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS26020 · US STSCI-NET - Space Telescope Science Institute	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS26522 · US SU-ASN-1 - Stevenson University	IPv4, IPv6	ris-rrc00, routeviews2, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 04:00 UTC
AS26793 · US ICS-LLC - ICS Advanced Technologies	IPv6	ris-rrc00, routeviews6	11 Oct 04:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 04:00 UTC
AS26868 · US NCTA-WASHINGTONDC - NCTA - The Internet & Television Association	IPv4, IPv6	ris-rrc00, routeviews2, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 04:00 UTC
AS27016 · US NRC-NET - United States Nuclear Regulatory Commission	IPv4, IPv6	ris-rrc00, routeviews2, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 04:00 UTC
AS27336 · US SENTARA-HEALTH-CARE - Sentara Healthcare	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS29865 · US CONTREALTYCORP - Continental Realty Corporation	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS30385 · US PERDUE-FARMS-INCORPORATED - Perdue Farms Incorporated	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS30641 · US STATEOFDE - STATE OF DELAWARE	IPv4	routeviews2	11 Oct 06:00 UTC	Source observations routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS31902 · US OTS - Open Technology Solutions, LLC	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS32073 · US MCPS-K12-MD-US - Montgomery County Public Schools	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS32291 · US ANNEARUNDELMEDICALCENTER - ANNE ARUNDEL MEDICAL CENTER	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS33170 · US MORGAN-STATE-UNIVERSITY - Morgan State University	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS33174 · US PRINCE-WILLIAM-COUNTY-VA-ASN - Prince William County Government Department of IT DoIT	IPv6	ris-rrc00, routeviews6	11 Oct 04:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 04:00 UTC
AS33506 · US CPINETWORKS-AS - COMMPUTERCATIONS	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC
AS33738 · US UNITED-STATES-HOLOCAUST-MEMORIAL-MUSEUM - United States Holocaust Memorial Museum	IPv4	ris-rrc00, routeviews2	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC routeviews2 · IPv4 · 11 Oct 06:00 UTC

Previous neighbors

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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

ARIN · fetched 11 Oct 04:20 UTC

Resource name: CMCS
Handle: AS33657
RDAP country: Not supplied
ASN: 33657

Registered organizations

Comcast Cable Communications, LLC

Last Changed: 25 Jan 2021 20:25 UTC

Registration: 16 Feb 2005 19:59 UTC

Registry source

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 06:00 UTC	IPv4	29	140.192.8.16/IPv4
routeviews2	11 Oct 04:00 UTC	IPv4	29	140.192.8.16/IPv4
routeviews6	11 Oct 04:00 UTC	IPv6	240	2406:840:feed:2::1/IPv6
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
ris-rrc00	11 Oct 00:00 UTC	IPv6	240	2a00:5884::6/IPv6, 89.234.186.6/IPv4
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	IPv6	240	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