AS33651 CMCS - Comcast Cable Communications, LLC
🇺🇸ARINassigned
Announced Prefixes (BGP)
456total
252 IPv4204 IPv6
IPv4 Addresses
Allocated (RIR)1,792
Announced (BGP)2.3M
IPv6 Addresses
Allocated (RIR)0
Announced (BGP)1×10³¹
Prefix Limit (IPv4)
1,000
Prefix Limit (IPv6)
1,000
Country
🇺🇸 USRIR
ARINStatus
assigned
Allocated
2005-02-16
Routing hygiene
Score 34/100 · Medium riskRPKI ROA coverage
95%
11 prefixes RPKI invalid
IRR route objects
16%
368 prefixes registered for another origin
Hijack signals
3
2 announced against others' ROAs, 1 own announced by others
Upstreams
1
diversity 0/100
- 84% of announced prefixes (383 of 456) have no IRR route object for this ASN
- Only one upstream seen in the AS paths of its routes
- Announces 2 prefixes that RPKI assigns to another network (possible hijack or misconfiguration)
- 5% of announced prefixes (23 of 456) have no valid ROA, 11 of them RPKI invalid
Based on 456 announced prefixes, updated daily (2026-10-22). How the score works · RPKI explained
Announced Prefixes
(BGP)456|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
5.182.186.0/24MOAS | Valid | - | 2026-10-26 |
5.182.193.0/24MOAS | Valid | - | 2026-10-26 |
5.182.194.0/24MOAS | Valid | RIPE | 2026-10-26 |
5.182.195.0/24MOAS | Valid | - | 2026-10-26 |
9.142.48.0/20MOAS | Valid | - | 2026-10-26 |
9.142.96.0/19MOAS | Valid | - | 2026-10-26 |
9.142.118.0/23MOAS | Invalid | - | 2026-10-26 |
16.5.8.0/23MOAS | Valid | ARINOther IRR | 2026-10-26 |
| Valid | - | 2026-10-26 | |
23.230.200.0/21MOAS | Valid | ARIN | 2026-10-26 |
1-10 of 456
1 / 46
Allocated Prefixes
(RIR)7Prefix | Country | RIR | Status |
|---|---|---|---|
| 192.70.238.0/24 | 🇺🇸 US | ARIN | allocated |
| 192.189.161.0/24 | 🇺🇸 US | ARIN | allocated |
| 192.206.19.0/24 | 🇺🇸 US | ARIN | allocated |
| 198.145.106.0/24 | 🇺🇸 US | ARIN | allocated |
| 198.202.219.0/24 | 🇺🇸 US | ARIN | allocated |
| 204.145.245.0/24 | 🇺🇸 US | ARIN | allocated |
| 216.170.120.0/24 | 🇺🇸 US | ARIN | allocated |
All 456 announced prefixes of AS33651 →
BGP Neighbours
(seen in AS paths)Upstreams (1)
Networks AS33651 hands its own prefixes to: transit providers, or peers at an exchange.
- AS7922Comcast Cable Communications456
Downstreams (98)
Networks whose own prefixes AS33651 passes on: usually its customers.
- AS1226California Department Of Technology16
- AS14203Juniper Networks9
- AS46341California Public Utilities Commission6
- AS6379A Link Network Services4
- AS10309County Of Marin4
- AS20066Supermicro Computer4
- AS36838INFOIMAGE OF CALIFORNIA4
- AS10982TiVo3
- AS11212COUNTY OF SONOMA3
- AS16920Wind River Systems3
- AS22700University Of San Francisco3
- AS23154Sanmina SCI Corporation3
- AS30175EPICOR3
- AS32504Intelletrace3
- AS46826Razzo Link3
- AS54113Fastly3
- AS6099Alameda County Office Of Education2
- AS11328Bio Rad Laboratories2
- AS11483Conviva2
- AS12054Alameda County2
- AS17117RITSnet2
- AS18880Lam Research Corporation2
- AS26325Technology Credit Union2
- AS32537Xilinx Incorporated2
- AS33161Chumash Casino Resort2
- AS35928BECKMAN COULTER2
- AS36040Google2
- AS46186Gilead Sciences2
- AS53497WebPerception2
- AS53985DODGE & COX2
- AS54469City Of Vacaville2
- AS55059Microwave Power Products2
- AS63435County Of Monterey2
- AS395011City And County Of San Francisco2
- AS395323County Of San Mateo2
- AS3708Pacific Biosciences Of California1
- AS4182MLSListings1
- AS5081CLARE COMPUTER SOLUTIONS1
- AS5091Stripe1
- AS5098Opus One Winery1
- AS7235LanMinds1
- AS10780Pure Storage1
- AS12222Akamai Technologies1
- AS14388Bronco Wine1
- AS14421Theravance Biopharma US1
- AS14706Monterey Bay Aquarium Research Institute1
- AS17003Zoetis1
- AS18556State Compensation Insurance Fund1
- AS18695Bay Medical Management1
- AS19099Rambus1
- AS19622Genomic Health1
- AS19637Avago Technologies U.S1
- AS20325Patelco Credit Union1
- AS20383Exchange Bank1
- AS22024Splunk1
- AS22216Siemens Corporation1
- AS22369Cloudmylab.Com1
- AS22695Playground Global1
- AS23472SonicWALL1
- AS26211Proofpoint1
- AS26758-1
- AS27580CONVERGEONE HOLDINGS1
- AS32319Marqeta1
- AS33311TOPCON POSITIONING SYSTEMS1
- AS33382CRYPTIC STUDIOS1
- AS36361Quora1
- AS36761Hearst Argyle Television1
- AS36776Five91
- AS40039ALPHA AND OMEGA SEMICONDUCTOR INCORPORATED1
- AS40385Saint Mary'S College Of California1
- AS40620QIAGEN Redwood City1
- AS46216Ice Consulting1
- AS46305Universal Audio1
- AS46425Salinas Valley Memorial Hospital1
- AS46520California Department Of Justice1
- AS46798Service Station Computer Systems1
- AS54104InfoObjects1
- AS54201We Link Networks1
- AS54654Mills College1
- AS55064Arista Networks1
- AS62508GlobalLogic1
- AS204662HARMONIC FRANCE Harmonic Technologies France SAS1
- AS393305G21
- AS393518ClaimRemedi1
- AS394516County Of Napa MIS1
- AS394557Roku1
- AS395132Meriwest Credit Union1
- AS395210Western Carriers1
- AS395757Santa Clara County Federal Credit Union1
- AS395844LUSD1
- AS395976Comcast Cable Communications1
- AS396943City Of Sunnyvale1
- AS397030Hilton Worldwide Holdings1
- AS397450City Of Fairfield1
- AS397620City Of Menlo Park1
- AS397765California College Of The Arts1
- AS398732Deutscher Properties Corporation1
- AS400484Natividad Medical Center1
Other adjacent networks (1)
Adjacent to AS33651 in the transit part of AS paths: peers, providers or customers.
- AS395240CARIAD1
ASPA
No ASPA
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
- ASPA explainedWhy AS33651 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 https://api.ipctl.io/v1/asn/33651Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/33651" | jq