Observed topology

AS12271 TWC-12271-NYC - Charter Communications Inc

Residential ARIN

Upstreams 2 carry this network

Downstreams 53 this network carries

Adjacent (IPv4) 53

Adjacent (IPv6) 8

Upstream graph Who carries AS12271, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS12271 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS12271: 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	6,902
AS6453	TATA COMMUNICATIONS (AMERICA) INC	Transit	IPv4	23

Transit

Downstream networks

All 53

Networks for which AS12271 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS22252	The City of New York	Unclassified	IPv4	222
AS18564	St. John's University, New York	Unclassified	IPv4	219
AS36100	MTC Broadband, Inc.	Unclassified	IPv4	216
AS19796	Shubert Organization, Inc.	Unclassified	IPv4	176
AS393753	The Brooklyn Hospital Center	Unclassified	IPv4	171
AS54226	SUNY College of Optometry	Unclassified	IPv4	169
AS395095	Orange Regional Medical Center	Unclassified	IPv4	118
AS18694	Sappi Fine Paper North America	Unclassified	IPv4	112
AS18438	Brown Brothers Harriman & Company	Unclassified	IPv4	100
AS14478	Recurse Center	Unclassified	IPv4 IPv6	93

All 53 downstreams →

Adjacency

Adjacent networks

All 55

Every AS seen directly next to AS12271 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS7843	Charter Communications Inc	Residential	IPv4 IPv6	10,241
AS22252	The City of New York	Unclassified	IPv4	222
AS18564	St. John's University, New York	Unclassified	IPv4	219
AS36100	MTC Broadband, Inc.	Unclassified	IPv4	216
AS19796	Shubert Organization, Inc.	Unclassified	IPv4	176
AS393753	The Brooklyn Hospital Center	Unclassified	IPv4	171
AS54226	SUNY College of Optometry	Unclassified	IPv4	169
AS395095	Orange Regional Medical Center	Unclassified	IPv4	118
AS18694	Sappi Fine Paper North America	Unclassified	IPv4	112
AS18438	Brown Brothers Harriman & Company	Unclassified	IPv4	100

All 55 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-10 10:00 UTC by route-views2,rrc00, as seen from 74 BGP vantage points across 71.97M 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.