AS33667 CMCS - Comcast Cable Communications, LLC
🇺🇸ARINassigned
Announced Prefixes (BGP)
289total
216 IPv473 IPv6
IPv4 Addresses
Allocated (RIR)5,632
Announced (BGP)1.0M
IPv6 Addresses
Allocated (RIR)6.3×10²⁹
Announced (BGP)1×10³¹
Routing hygiene
Score 32/100 · Medium riskRPKI ROA coverage
91.7%
9 prefixes RPKI invalid
IRR route objects
27.3%
194 prefixes registered for another origin
Hijack signals
2
1 announced against others' ROAs, 1 own announced by others
Upstreams
2
diversity 17/100
- 73% of announced prefixes (210 of 289) have no IRR route object for this ASN
- Routes concentrated on one upstream (91% of routes)
- Announces 1 prefix that RPKI assigns to another network (possible hijack or misconfiguration)
- 8% of announced prefixes (24 of 289) have no valid ROA, 9 of them RPKI invalid
Based on 289 announced prefixes, updated daily (2026-10-25). How the score works · RPKI explained
Announced Prefixes
(BGP)289|
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 | - | 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 289
1 / 29
Allocated Prefixes
(RIR)14Prefix | Country | RIR | Status |
|---|---|---|---|
| 5.182.193.0/24 | 🇷🇺 RU | RIPE | assigned |
| 45.67.141.0/24 | 🇺🇸 US | RIPE | assigned |
| 63.246.148.0/24 | 🇦🇹 AT | RIPE | assigned |
| 63.246.152.0/24 | 🇺🇸 US | RIPENCC | allocated |
| 63.246.159.0/24 | 🇺🇸 US | RIPE | assigned |
| 78.31.206.0/24 | 🇩🇰 DK | RIPE | assigned |
| 103.111.63.0/24 | 🇺🇸 US | APNIC | assigned |
| 135.132.72.0/22 | 🇺🇸 US | RIPE | assigned |
| 135.132.76.0/22 | 🇺🇸 US | RIPE | assigned |
| 138.226.196.0/22 | 🇺🇸 US | RIPE | assigned |
1-10 of 14
1 / 2
All 289 announced prefixes of AS33667 →
BGP Neighbours
(seen in AS paths)Upstreams (2)
Networks AS33667 hands its own prefixes to: transit providers, or peers at an exchange.
Downstreams (52)
Networks whose own prefixes AS33667 passes on: usually its customers.
- AS2894California Department Of Water Resources9
- AS23338DCS Pacific Star8
- AS25753California Public Employees' Retirement System6
- AS11620Succeed.Net4
- AS13335Cloudflare4
- AS20940AKAMAI ASN1 Akamai International B.V4
- AS32688THE GOLDEN 1 CREDIT UNION4
- AS10309County Of Marin3
- AS46341California Public Utilities Commission3
- AS46867Sebastian3
- AS53782Pacific Coast Producers3
- AS402224Merced County Information Systems3
- AS11681Integrity Networks2
- AS14443Broadridge Financial Solutions2
- AS17381Williams Sonoma2
- AS18841Trimble2
- AS22617Superior Court Of California, County Of Sacramento2
- AS22768SYNERGY BROADBAND2
- AS36040Google2
- AS46902California State Teachers Retirement System (CalSTRS)2
- AS54113Fastly2
- AS394516County Of Napa MIS2
- AS398204City Of Stockton2
- AS5081CLARE COMPUTER SOLUTIONS1
- AS5091Stripe1
- AS11574San Francisco Baseball Associates1
- AS11829Cadence Design Systems1
- AS12054Alameda County1
- AS13511Univision Communications1
- AS19637Avago Technologies U.S1
- AS21954Telestream1
- AS23411-1
- AS27580CONVERGEONE HOLDINGS1
- AS30175EPICOR1
- AS32504Intelletrace1
- AS36835Nugget Market1
- AS36838INFOIMAGE OF CALIFORNIA1
- AS46201County Of Yuba1
- AS46798Service Station Computer Systems1
- AS54469City Of Vacaville1
- AS54767Restoration Hardware1
- AS55278California Capital Insurance Company1
- AS393935Sierra Central Credit Union1
- AS394377County Of Tulare1
- AS395536Trimark Associates1
- AS396505ENLOE MEDICAL CENTER1
- AS397062Sun Maid Growers Of California1
- AS397813Clarke Broadcasting Corporation1
- AS398572Monolithic Power Systems1
- AS399761Stream IT Networks1
- AS400046Zinus1
- AS400147City Of Modesto1
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 AS33667 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/33667Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/33667" | jq