asn.dev

Observed topology

AS33651 CMCS - Comcast Cable Communications, LLC

Unclassified ARIN Cable/DSL/ISP

Upstreams 2 carry this network
Downstreams 143 this network carries
Adjacent (IPv4) 141
Adjacent (IPv6) 18
Upstream graph Who carries AS33651, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS33651 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS33651: 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 IPv69,801
AS3356Level 3 Parent, LLCTransitIPv4275

Transit

Downstream networks

All 143

Networks for which AS33651 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS1226California Department of TechnologyUnclassifiedIPv4373
AS46341California Public Utilities CommissionUnclassifiedIPv4198
AS10309County of MarinUnclassifiedIPv4191
AS6379A-Link Network Services, Inc.UnclassifiedIPv4164
AS14203Juniper Networks, Inc.UnclassifiedIPv4 IPv6150
AS25875FriendFinder Networks IncHostingIPv4134
AS20066Supermicro ComputerUnclassifiedIPv4128
AS22700University of San FranciscoUnclassifiedIPv4128
AS46826Razzo Link, Inc.UnclassifiedIPv4123
AS54113Fastly, Inc.HostingIPv4 IPv6122

All 143 downstreams →

Adjacency

Adjacent networks

All 146

Every AS seen directly next to AS33651 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS7922Comcast Cable Communications, LLCResidentialIPv4 IPv616,198
AS1226California Department of TechnologyUnclassifiedIPv4489
AS3356Level 3 Parent, LLCTransitIPv4354
AS46341California Public Utilities CommissionUnclassifiedIPv4198
AS10309County of MarinUnclassifiedIPv4191
AS6379A-Link Network Services, Inc.UnclassifiedIPv4164
AS14203Juniper Networks, Inc.UnclassifiedIPv4 IPv6150
AS6099Alameda County Office of EducationEducationIPv4136
AS25875FriendFinder Networks IncHostingIPv4134
AS20066Supermicro ComputerUnclassifiedIPv4128

All 146 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.