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

13Observed 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 06:00 UTC. Validator: 11 Oct 07:43 UTC. Publication-point issues: 91

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.

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

Prefix	RPKI	Last observed	Details
2001:559:48::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:7a::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:87::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:a2::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:ae::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:db::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:110::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:136::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:16a::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:1da::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:1f8::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:202::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:214::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:246::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:25a::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:25b::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:282::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:284::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:288::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:2b6::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:2ca::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:2cb::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:2f3::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:300::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid
2001:559:304::/48	Valid	11 Oct 06:00 UTC	2 source observations ris-rrc00 · 2026-10-11T00:00:00+00:00 · 1 selected peers · RPKI valid routeviews6 · 2026-10-11T06:00:00+00:00 · 1 selected peers · RPKI valid

Next rows

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Observed AS neighbors

13 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.

13 matching neighbors · 1–13 shown

Network	IPv4/IPv6	Seen in	Last observed	Details
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 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC
AS7922 · US Comcast Cable Communications, LLC	IPv6	ris-rrc00, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC
AS10918 · US ACCURANT - Accurant Cloud Services LLC	IPv6	ris-rrc00, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC
AS16881 · US DAVID-C-PRALL-INTERNET - Prall, Inc., David C	IPv6	ris-rrc00	11 Oct 00:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC
AS26522 · US SU-ASN-1 - Stevenson University	IPv6	ris-rrc00, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC
AS26793 · US ICS-LLC - ICS Advanced Technologies	IPv6	ris-rrc00, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC
AS26868 · US NCTA-WASHINGTONDC - NCTA - The Internet & Television Association	IPv6	ris-rrc00, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC
AS27016 · US NRC-NET - United States Nuclear Regulatory Commission	IPv6	ris-rrc00, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 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 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC
AS396017 · US COMCAST-MES - Comcast Cable Communications, LLC	IPv6	ris-rrc00, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC
AS398820 · US EA-ASN-01 - Eagle Alliance	IPv6	ris-rrc00, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC
AS401533 · US TGSLLC-02 - TGS, LLC	IPv6	ris-rrc00, routeviews6	11 Oct 06:00 UTC	Source observations ris-rrc00 · IPv6 · 11 Oct 00:00 UTC routeviews6 · IPv6 · 11 Oct 06:00 UTC

Clear neighbor filters

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 13 of 13 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
routeviews6	11 Oct 06:00 UTC	IPv6	240	2406:840:feed:2::1/IPv6
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
ris-rrc00	11 Oct 00:00 UTC	IPv4	27	2a00:5884::6/IPv6, 89.234.186.6/IPv4
ris-rrc00	11 Oct 00:00 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
ris-rrc00	10 Oct 16:00 UTC	IPv6	240	2a00:5884::6/IPv6, 89.234.186.6/IPv4