AS12271 TWC-12271-NYC - Charter Communications Inc
🇺🇸ARINassigned
Announced Prefixes (BGP)
124total
116 IPv48 IPv6
IPv4 Addresses
Allocated (RIR)483,584
Announced (BGP)2.9M
IPv6 Addresses
Allocated (RIR)7.9×10²⁸
Announced (BGP)1.5×10³⁰
Routing hygiene
Score 17/100 · Low riskRPKI ROA coverage
90.3%
3 prefixes RPKI invalid
IRR route objects
96.8%
2 prefixes registered for another origin
Hijack signals
4
0 announced against others' ROAs, 4 own announced by others
Upstreams
1
diversity 0/100
- Only one upstream seen in the AS paths of its routes
- 10% of announced prefixes (12 of 124) have no valid ROA, 3 of them RPKI invalid
Based on 124 announced prefixes, updated daily (2026-10-25). How the score works · RPKI explained
Announced Prefixes
(BGP)124|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| Valid | ARINOther IRR | - | |
| Valid | Other IRR | - | |
| Valid | Other IRR | - | |
| Valid | Other IRR | - | |
| Invalid | - | - | |
| Valid | Other IRR | - | |
| Valid | Other IRR | - | |
| Valid | Other IRR | - | |
| Valid | ARIN | - | |
| Valid | Other IRR | - |
1-10 of 124
1 / 13
Allocated Prefixes
(RIR)14Prefix | Country | RIR | Status |
|---|---|---|---|
| 23.246.64.0/18 | 🇺🇸 US | ARIN | allocated |
| 24.90.0.0/16 | 🇺🇸 US | ARIN | allocated |
| 24.102.64.0/18 | 🇺🇸 US | ARIN | allocated |
| 24.104.192.0/18 | 🇺🇸 US | ARIN | allocated |
| 24.136.96.0/19 | 🇺🇸 US | ARIN | allocated |
| 24.193.0.0/16 | 🇺🇸 US | ARIN | allocated |
| 66.108.0.0/16 | 🇺🇸 US | ARIN | allocated |
| 142.255.0.0/17 | 🇺🇸 US | ARIN | allocated |
| 149.89.0.0/16 | 🇺🇸 US | ARIN | allocated |
| 158.222.128.0/17 | 🇺🇸 US | ARIN | allocated |
1-10 of 14
1 / 2
All 124 announced prefixes of AS12271 →
Downstream Customers(1)
| ASN | Name |
|---|---|
| AS14460 | 🇺🇸HORIZON - Horizon Media, Inc. |
BGP Neighbours
(seen in AS paths)Upstreams (1)
Networks AS12271 hands its own prefixes to: transit providers, or peers at an exchange.
- AS7843Charter Communications124
Downstreams (44)
Networks whose own prefixes AS12271 passes on: usually its customers.
- AS22252The City Of New York9
- AS36100MTC Broadband8
- AS18564St. John'S University, New York5
- AS18694Sappi Fine Paper North America4
- AS19796Shubert Organization3
- AS54226SUNY College Of Optometry3
- AS393753The Brooklyn Hospital Center3
- AS14478Recurse Center2
- AS54113Fastly2
- AS395095Orange Regional Medical Center2
- AS6292MTAPD1
- AS13975NYCPM1
- AS14460Horizon Media1
- AS14465HITN1
- AS16770Astoria Generating Company, L.P1
- AS22303State University Of New York At New Paltz1
- AS23010Fried, Frank, Harris, Shriver & Jacobson LLP1
- AS23097COHEN & STEERS CAPITAL MGMT1
- AS23325Magnitude Capital1
- AS25816Touro College1
- AS25891School Of Visual Arts1
- AS26738Deerfield Partners, L.P1
- AS27185Danbury Hospital ITG1
- AS30339Davis & Gilbert LLP1
- AS32730LG CNS America1
- AS33010The Interchurch Center1
- AS33428The New York Historical Society1
- AS39943St. Francis College1
- AS40170Intermetro Communications1
- AS40362Chapin School1
- AS46765Liberum Capital1
- AS53693Ralph Appelbaum Associates1
- AS55123Brilliant Jewelers/MJJ1
- AS62566Starbucks Coffee Company1
- AS393562Mobilitie1
- AS3935699/11 MEMORIAL1
- AS395090Gagosian Gallery1
- AS397352Medisys Health Network1
- AS397595MTAPD1
- AS400392Empire Resorts1
- AS400508The Juilliard School1
- AS401827UNITED NATIONS FEDERAL CREDIT UNION UNFCU1
- AS402355Visentry1
- AS402494Bartlett1
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/12271Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/12271" | jq