Observed topology

AS20001 TWC-20001-PACWEST - Charter Communications Inc

Residential DROP-listed space ARIN Cable/DSL/ISP

Upstreams 5 carry this network

Downstreams 151 this network carries

Adjacent (IPv4) 154

Adjacent (IPv6) 9

Upstream graph Who carries AS20001, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS20001 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS20001: the AS immediately before it in a routing path. Ranked by how many paths showed the relationship, which reflects how widely it is used, not how much traffic crosses it.

AS	Network	Type	Families	Paths seen
AS7843	Charter Communications Inc	Residential	IPv4 IPv6	32,798
AS20115	Charter Communications LLC	Residential	IPv4 IPv6	1,672
AS6939	Hurricane Electric LLC	Transit	IPv4	264
AS701	Verizon Business	Residential	IPv4	36
AS6453	TATA COMMUNICATIONS (AMERICA) INC	Transit	IPv4	23

Transit

Downstream networks

All 151

Networks for which AS20001 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS4179	City of Los Angeles	Unclassified	IPv4	1,155
AS36315	Servpac Inc.	Unclassified	IPv4	969
AS11188	LOS ANGELES COUNTY - INTERNAL SERVICESDIVISION	Unclassified	IPv4	543
AS19011	Iteris, Inc.	Unclassified	IPv4	504
AS5033	Key Information Systems, Inc.	Unclassified	IPv4	497
AS25671	Wholesale Air-time Inc.	Unclassified	IPv4 IPv6	258
AS53527	Los Angeles Sheriff's Department	Unclassified	IPv4	252
AS399269	City of Torrance	Unclassified	IPv4	252
AS23000	Wescom Credit Union	Unclassified	IPv4	246
AS32358	County of Ventura	Unclassified	IPv4	246

All 151 downstreams →

Adjacency

Adjacent networks

All 156

Every AS seen directly next to AS20001 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS7843	Charter Communications Inc	Residential	IPv4 IPv6	46,312
AS20115	Charter Communications LLC	Residential	IPv4 IPv6	3,090
AS4179	City of Los Angeles	Unclassified	IPv4	1,155
AS36315	Servpac Inc.	Unclassified	IPv4	969
AS5033	Key Information Systems, Inc.	Unclassified	IPv4	558
AS11188	LOS ANGELES COUNTY - INTERNAL SERVICESDIVISION	Unclassified	IPv4	543
AS19011	Iteris, Inc.	Unclassified	IPv4	504
AS6939	Hurricane Electric LLC	Transit	IPv4	264
AS25671	Wholesale Air-time Inc.	Unclassified	IPv4 IPv6	258
AS53527	Los Angeles Sheriff's Department	Unclassified	IPv4	252

All 156 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-03 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.45M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.

Inferred from path position, not from any declaration by either party. A network appearing here is carrying these routes; whether that is a paid transit arrangement, a backup, or something else is not something routing data can tell you. Adjacency is not the same as peering. Being next to each other in a path covers paid transit, settlement-free peering and customer connections alike, and routing data cannot distinguish them. Treat this as "these networks exchange routes", nothing more specific.

Cross-check against RIPEstat or BGP.tools, which observe from a different and larger set of vantage points.