AS33651 · US — Comcast Cable Communications, LLC

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CMCS · ARIN · US

Identity source

AS33651 ·

US Comcast Cable Communications, LLC

NRO allocation data

109IPv4 prefixes

187IPv6 prefixes

93Observed neighbors

RPKIValid: 281 Invalid: 4 Not found: 11 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: 82,176

IPv6 addresses: 634068294203857241212467544064

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Observed originated prefixes

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

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

Prefix	RPKI	Last observed	Details
5.182.186.0/24	Valid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
5.182.193.0/24	Valid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
5.182.194.0/24	Valid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
5.182.195.0/24	Valid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
9.142.48.0/20	Valid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
9.142.96.0/19	Valid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
9.142.118.0/23	Invalid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI invalid Validation evidence prefix too specific { "state": "invalid", "reason": "prefix too specific", "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": "9.142.64.0/18", "asn": 33667, "max_length": 18, "trust_anchor": "ripe" }, { "prefix": "9.142.96.0/19", "asn": 33667, "max_length": 19, "trust_anchor": "ripe" }, { "prefix": "9.142.0.0/16", "asn": 6079, "max_length": 24, "trust_anchor": "ripe" }, { "prefix": "9.142.96.0/19", "asn": 33651, "max_length": 19, "trust_anchor": "ripe" } ] }
16.5.8.0/23	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
23.230.200.0/21	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
24.104.72.0/24	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
24.104.73.0/24	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
24.104.138.0/23	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
24.104.150.0/24	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
36.255.215.0/24	Valid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
40.27.174.0/23	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
45.67.141.0/24	Valid	11 Oct 02:00 UTC	1 source observations routeviews2 · 2026-10-11T02:00:00+00:00 · 1 selected peers · RPKI valid
50.145.55.0/24	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
50.200.170.0/24	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
50.201.8.0/23	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
50.201.171.0/24	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
50.204.119.0/24	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
50.204.137.0/24	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
50.205.226.0/24	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
50.206.118.0/24	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
50.206.120.0/23	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

Next rows

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Observed AS neighbors

93 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.

93 matching neighbors · 51–75 shown

Network	IPv4/IPv6	Seen in	Last observed	Details
AS36040 · US YOUTUBE - Google 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
AS36761 · US KSBW-TV - Hearst-Argyle Television, 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
AS36776 · US FIVE9 - Five9 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
AS40039 · US ALPHA-N-OMEGA-AOS-40 - ALPHA AND OMEGA SEMICONDUCTOR INCORPORATED	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
AS40385 · US SAINT-MARYS-CA-AS - Saint Marys College of California	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
AS40620 · US INGENUITY-SYSTEMS - QIAGEN Redwood City, 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
AS46186 · US GILD-SCI - Gilead Sciences	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
AS46216 · US ICECONSULTING - Ice Consulting	IPv4	ris-rrc00	11 Oct 00:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC
AS46305 · US UA-4585 - Universal Audio, 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
AS46425 · US SVMH-AS - Salinas Valley Memorial Hospital	IPv4	ris-rrc00	11 Oct 00:00 UTC	Source observations ris-rrc00 · IPv4 · 11 Oct 00:00 UTC
AS46520 · US CA-DOJ - California Department of Justice	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
AS46826 · US RAZZO - Razzo Link, 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
AS46864 · US WORKD-IT - Workday, 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
AS53497 · US WEBPERCEPTION - WebPerception, 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
AS53985 · US DODGE-AND-COX-FUNDS - DODGE & COX	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
AS54104 · US INFOO-54104 - InfoObjects 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
AS54113 · US FASTLY - Fastly, Inc.	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
AS54201 · US We Link Networks LLC	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
AS54246 · US AFNI-INTERNET - AFNI, Inc.	IPv4	routeviews2	11 Oct 02:00 UTC	Source observations routeviews2 · IPv4 · 11 Oct 02:00 UTC
AS54654 · US MILLSCOLLEGE - Mills College	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
AS55059 · US MPP - Microwave Power Products, 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
AS55064 · US Arista Networks, Inc.	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
AS62508 · US GLOBAL-US - GlobalLogic 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
AS63435 · US MONTEREY-AS-01 - County of Monterey	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
AS204662 · FR HARMONIC_FRANCE Harmonic Technologies France SAS	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

Previous 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 93 matching neighbors, in table sort order, independent of table page.

Peering & locations

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Registry information

ARIN · fetched 11 Oct 02:42 UTC

Resource name: CMCS
Handle: AS33651
RDAP country: Not supplied
ASN: 33651

Registered organizations

Comcast Cable Communications, LLC

Last Changed: 25 Jan 2021 20:22 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.

AS33651–AS33651 · 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	109	140.192.8.16/IPv4
routeviews6	11 Oct 02:00 UTC	IPv6	187	2406:840:feed:2::1/IPv6
routeviews2	11 Oct 00:00 UTC	IPv4	109	140.192.8.16/IPv4
ris-rrc00	11 Oct 00:00 UTC	IPv6	186	2a00:5884::6/IPv6, 89.234.186.6/IPv4
routeviews6	11 Oct 00:00 UTC	IPv6	187	2406:840:feed:2::1/IPv6
ris-rrc00	11 Oct 00:00 UTC	IPv4	83	2a00:5884::6/IPv6, 89.234.186.6/IPv4
ris-rrc00	10 Oct 16:00 UTC	IPv4	83	2a00:5884::6/IPv6, 89.234.186.6/IPv4
ris-rrc00	10 Oct 16:00 UTC	IPv6	186	2a00:5884::6/IPv6, 89.234.186.6/IPv4