AS20115

AS20115 is a primary autonomous system of Charter Communications, the large US residential cable operator that markets service under the Spectrum brand. Registered under ARIN (with an originating date around 2001), it is fundamentally eyeball space: community route-intelligence tools rank it among the top networks by estimated eyeballs (roughly #31 globally and #6 in the US) and around #35 by originated IPv4 space. It announces on the order of two-to-three thousand IPv4 prefixes (about 12.8–13.0 million addresses) and is notably IPv6-active, with a comparable or larger IPv6 prefix count. Charter is the product of the 2016 consolidation of Charter, Time Warner Cable, and Bright House Networks, which left it with an extensive family of sibling ASNs — including AS7843, AS33363, AS10796, AS11426/AS11427, AS40264, AS22974, and AS19157 — carried over from the legacy footprints. One routing-hygiene detail stands out for any RPKI scoring: in the observed view AS20115 carried a large number of RPKI-invalid originated prefixes (on the order of 1,410, split across IPv4 and IPv6), well above its peers, which is worth flagging though such invalids are often stale ROAs rather than evidence of malice. For triage, a 20115 address is almost always a US Spectrum residential subscriber, so apply dynamic-IP and possible-CGNAT caution.

Operator

Charter Communications, LLC [Confirmed] — ARIN RDAP/WHOIS

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP

Allocated

~2001-03-26 (bgp.tools; ARIN registration last changed 2018-11-20) [Likely] — bgp.tools / ARIN RDAP

Org status

active; product of the 2016 Charter + Time Warner Cable + Bright House consolidation (Spectrum brand) — spectrum.com

Security/abuse context

residential/eyeball space with dynamic IP reassignment and possible CGNAT; infected-home-PC/botnet-node considerations apply per-IP and dated. RPKI: notable invalid count (~1,410 invalid originated, 909 v4 / 501 v6, vs ~4,650 valid) — flag for ROV, but likely stale ROAs not malice. No carrier-specific abuse listing of note as of 2026-06-04 — bgp.he.net

Network & routing

Network type

ISP-eyeball (large US residential, Spectrum brand) [Confirmed] — bgp.tools + CAIDA

Size

~2,281–3,410 IPv4 prefixes originated (~2,642 total; ~12.8–13.0M addrs), ~1,674–2,866 IPv6 (IPv6-heavy); community ranks ~#31 eyeballs globally / ~#6 US / ~#35 originated IPv4 — bgp.he.net / bgp.tools / BigDataCloud (2026-05/06)

Routing/peering

~163–240 peers; upstreams incl. AS3356 (Lumen), AS1299 (Arelion), AS3257 (GTT), plus AT&T/Comcast peering — bgp.tools

Notable usage

large US residential cable broadband (Spectrum) — spectrum.com

Related ASNs

AS7843, AS33363, AS10796, AS11426/AS11427, AS40264, AS22974, AS19157 (legacy TWC / Bright House / Charter)

Analyst note

A 20115 IP is almost always a US Spectrum residential subscriber; apply dynamic-IP/CGNAT caution. Note the elevated RPKI-invalid count if you score route validity.