Autonomous system
AS11955 TWC-11955-ATLANTA
Residential ARIN
Summary
Charter Communications (Spectrum, ex-Time Warner Cable)
isp legacy
TWC-11955-ATLANTA is one of the regional autonomous systems Time Warner Cable operated, now held by Charter Communications and serving the Spectrum brand after the 2016 merger.
What it's used for
Cable broadband to homes. RIS sees 27 IPv4 prefixes carrying 60,160 addresses plus eight IPv6 prefixes, and the reverse DNS is unambiguous: nearly every sampled address answers as syn-0xx-xxx-xxx-xxx.res.spectrum.com, Spectrum's generated residential naming. Two blocks (64.183.149.0/24 and 150.224.254.0/24) answer under biz.spectrum.com instead, marking commercial subscribers, and one under inf.spectrum.com for infrastructure. This is an eyeball network, and the registrants — Charter Communications Inc and Charter Communications LLC across every block checked — agree.
Notable
Only one neighbour is observed. That is not a sign of fragility: a regional cable AS like this one does not buy transit on the open market, it hangs off its parent's backbone, so the world sees a single adjacency no matter how large the subscriber base behind it. Address count and neighbour count are telling you about different things here, and only the first one is about size.
Interesting
The registry keeps the lineage visible. Blocks are still named RRWE and ROAD-RUNNER-3-A — Road Runner, Time Warner's broadband brand — and one PTR still resolves under sw.rr.com. Note also that the ATLANTA in the handle is a legacy market label and should not be read as the geography of all 27 prefixes.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS7843 | Charter Communications Inc | 1,946 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 27 prefixes · 60.16K addresses IPv6 8 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 35 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11955- Registry name
- TWC-11955-ATLANTA
- Registrant
- Charter Communications Inc
- Abuse contact
- abuse@charter.net
- Registered
- 2000-06-09
- Last changed
- 2018-11-27
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 35 valid, 0 with no ROA
- ROAs
- 51 authorising AS11955
- ASPA
- no ASPA record
- IRR
- 46% registered · 16 of 35 announcements
- Route objects
- 50 naming AS11955
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 436 networks and 1,771 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere