Home ASN LookupAS33666

AS33666 CMCS - Comcast Cable Communications, LLC

🇺🇸

ARINassigned

Announced Prefixes (BGP)

103total

91 IPv412 IPv6

IPv4 Addresses

Allocated (RIR)0

Announced (BGP)251,392

IPv6 Addresses

Allocated (RIR)0

Announced (BGP)1×10³¹

Prefix Limit (IPv4)

200

Prefix Limit (IPv6)

Country

🇺🇸 US

RIR

ARIN

Status

assigned

Allocated

2005-02-16

Announced Prefixes

(BGP)103

Prefix	RPKI	IRR	Last Seen
23.25.176.0/21	Valid	ARIN	2026-10-11
23.30.192.0/21	Valid	ARIN	2026-10-11
24.153.90.0/23	Valid	ARIN	2026-10-11
50.77.32.0/21	Valid	ARIN	2026-10-11
50.185.32.0/20	Valid	ARIN	2026-10-11
50.215.208.0/21	Valid	ARIN	2026-10-11
50.240.0.0/21	Valid	-	2026-10-11
50.242.152.0/21	Valid	ARIN	2026-10-11
50.248.120.0/21	Valid	ARIN	2026-10-11
50.252.152.0/21	Valid	ARIN	2026-10-11

1-10 of 103

1 / 11

All 103 announced prefixes of AS33666 →

BGP Neighbours

(seen in AS paths)

Upstreams (1)

Networks AS33666 hands its own prefixes to: transit providers, or peers at an exchange.

AS7922Comcast Cable Communications103

Downstreams (4)

Networks whose own prefixes AS33666 passes on: usually its customers.

AS13335Cloudflare4
AS7970Leon County School District3
AS1830Gulf Coast State College1
AS54248School Board Of Gadsden County1

Transfer History

Registry transfers of AS33666 between organisations.

AS33666M&A · 2016-08-31
Comcast Cable Communications, Inc.
🇺🇸 US ARIN
→
Comcast Cable Communications, LLC
🇺🇸 US ARIN

Date	Resource	From	To	Type
2016-08-31	AS33666	Comcast Cable Communications, Inc. 🇺🇸 US ARIN	Comcast Cable Communications, LLC 🇺🇸 US ARIN	M&A

ASPA

No ASPA

External Links

ARIN Whois RIPEstat

Learn more

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
ASPA explainedWhy AS33666 should publish an ASPA object
IPv4 transfers in the ARIN regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Open

GEThttps://api.ipctl.io/v1/asn/33666

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/33666" | jq