AS33657 CMCS - Comcast Cable Communications, LLC
🇺🇸ARINassigned
Announced Prefixes (BGP)
449total
188 IPv4261 IPv6
IPv4 Addresses
Allocated (RIR)5,120
Announced (BGP)1.6M
IPv6 Addresses
Allocated (RIR)0
Announced (BGP)1×10³¹
Routing hygiene
Score 27/100 · Medium riskRPKI ROA coverage
97.3%
7 prefixes RPKI invalid
IRR route objects
5.8%
422 prefixes registered for another origin
Hijack signals
0
0 announced against others' ROAs, 0 own announced by others
Upstreams
1
diversity 0/100
- 94% of announced prefixes (423 of 449) have no IRR route object for this ASN
- Only one upstream seen in the AS paths of its routes
- 3% of announced prefixes (12 of 449) have no valid ROA, 7 of them RPKI invalid
Based on 449 announced prefixes, updated daily (2026-10-26). How the score works · RPKI explained
Announced Prefixes
(BGP)449|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| Valid | - | - | |
| Valid | - | - | |
| Valid | - | - | |
| Valid | - | - | |
| Valid | - | - | |
| Valid | - | - | |
| Valid | Other IRR | - | |
| Valid | - | - | |
| Valid | - | - | |
| Valid | - | - |
1-10 of 449
1 / 45
Allocated Prefixes
(RIR)4Prefix | Country | RIR | Status |
|---|---|---|---|
| 69.67.80.0/20 | 🇺🇸 US | ARIN | allocated |
| 192.110.220.0/23 | 🇺🇸 US | ARIN | allocated |
| 192.189.235.0/24 | 🇺🇸 US | ARIN | allocated |
| 199.249.199.0/24 | 🇺🇸 US | ARIN | allocated |
All 449 announced prefixes of AS33657 →
Downstream Customers(1)
| ASN | Name |
|---|---|
| AS16881 | 🇺🇸DAVID-C-PRALL-INTERNET - Prall, Inc., David C |
BGP Neighbours
(seen in AS paths)Upstreams (1)
Networks AS33657 hands its own prefixes to: transit providers, or peers at an exchange.
- AS7922Comcast Cable Communications449
Downstreams (66)
Networks whose own prefixes AS33657 passes on: usually its customers.
- AS27016United States Nuclear Regulatory Commission15
- AS32073Montgomery County Public Schools6
- AS394077Lifebridge Health5
- AS11790Random House4
- AS22101Cyber Point International4
- AS26522Stevenson University4
- AS53373Mathematica4
- AS398820Eagle Alliance4
- AS2384Architect Of The Capitol3
- AS2703-3
- AS11951Medical Computer Systems3
- AS16463Data Processing Solutions3
- AS25716Trane Technologies Company3
- AS401366Vox Flow3
- AS572Greater Baltimore Medical Center2
- AS16881Prall, ., David C2
- AS19936Gordon Food Service2
- AS20137USAGM2
- AS22602Experient2
- AS40410FRIT2
- AS46084ASRC FEDERAL HOLDING COMPANY2
- AS53350Embassy Of Hungary2
- AS400678LIDL US OPERATIONS2
- AS400902Gaylord National Resort & Convention Center2
- AS3573Accenture LLP1
- AS3705U.S. Government Publishing Office1
- AS4880Lifeline Systems, Company1
- AS5721National Defense University1
- AS10918Accurant Cloud Services1
- AS11131University Of Maryland Baltimore County (UMBC)1
- AS13511Univision Communications1
- AS14246Thales Communications1
- AS17190Washington Metropolitan Area Transit Authority1
- AS21683Dalko1
- AS22593Blue Cross And Blue Shield Of North Carolina1
- AS22694NBCUniversal1
- AS22815Kelly And Associates Insurance Group1
- AS22962The Kennedy Center1
- AS25696-1
- AS26020Space Telescope Science Institute1
- AS26793ICS Advanced Technologies1
- AS26868NCTA The Internet & Television Association1
- AS27336Sentara Healthcare1
- AS29865Continental Realty Corporation1
- AS30330Automotive Rentals1
- AS30385Perdue Farms Incorporated1
- AS32291ANNE ARUNDEL MEDICAL CENTER1
- AS33174Prince William County Government Department Of IT (DoIT)1
- AS33506COMMPUTERCATIONS1
- AS33738United States Holocaust Memorial Museum1
- AS36040Google1
- AS36151The Alta Condominium Unit Owner'S Association1
- AS36457District Photo1
- AS40857IT CNP1
- AS40954JM Family Enterprises1
- AS46187International Spy Museum1
- AS46200IT Curves1
- AS46784Davis Polk & Wardwell, LLP1
- AS53252World Wide Technology Holding1
- AS53302Baltimore County Government1
- AS62957HOSPITALITY NETWORK1
- AS393319Anduril Industries1
- AS395973Google1
- AS396017Comcast Cable Communications1
- AS397487Baltimore Ravens Limited Partnership1
- AS401533TGS1
Other adjacent networks (1)
Adjacent to AS33657 in the transit part of AS paths: peers, providers or customers.
- AS3356Level 3 Parent4
External Links
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
- How to run an ASPA checkVerify the upstream providers listed above
- 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 https://api.ipctl.io/v1/asn/33657Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/33657" | jq