AS11955 TWC-11955-ATLANTA

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.