asn.dev

Observed topology

AS33491 COMCAST-33491 - Comcast Cable Communications, LLC

Unclassified ARIN Cable/DSL/ISP

Upstreams 2 carry this network
Downstreams 254 this network carries
Adjacent (IPv4) 253
Adjacent (IPv6) 13
Upstream graph Who carries AS33491, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS33491 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS33491: 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.

ASNetworkTypeFamiliesPaths seen
AS7922Comcast Cable Communications, LLCResidentialIPv4 IPv610,585
AS3356Level 3 Parent, LLCTransitIPv4279

Transit

Downstream networks

All 254

Networks for which AS33491 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS14858Hanson Information Systems, Inc. / Family NetUnclassifiedIPv4542
AS36373Community Hospitals, IndianapolisUnclassifiedIPv4513
AS14414Telit IoT Platforms, LLCUnclassifiedIPv4378
AS13950DLS Internet Services, IncUnclassifiedIPv4362
AS36319NorthShore University HealthSystemUnclassifiedIPv4312
AS33248City of Evanston, IllinoisUnclassifiedIPv4297
AS26912Northwest Community HospitalUnclassifiedIPv4293
AS27482American Eagle Computer Products, Inc.HostingIPv4288
AS40038Moraine Valley Community CollegeUnclassifiedIPv4282
AS19265Memorial Medical CenterUnclassifiedIPv4261

All 254 downstreams →

Adjacency

Adjacent networks

All 256

Every AS seen directly next to AS33491 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS7922Comcast Cable Communications, LLCResidentialIPv4 IPv622,233
AS3356Level 3 Parent, LLCTransitIPv4 IPv64,035
AS14858Hanson Information Systems, Inc. / Family NetUnclassifiedIPv4542
AS36373Community Hospitals, IndianapolisUnclassifiedIPv4513
AS13950DLS Internet Services, IncUnclassifiedIPv4430
AS14414Telit IoT Platforms, LLCUnclassifiedIPv4378
AS36319NorthShore University HealthSystemUnclassifiedIPv4312
AS33248City of Evanston, IllinoisUnclassifiedIPv4297
AS26912Northwest Community HospitalUnclassifiedIPv4293
AS27482American Eagle Computer Products, Inc.HostingIPv4288

All 256 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-11 10:00 UTC by route-views2,rrc00, as seen from 74 BGP vantage points across 73.24M 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.