asn.dev

Observed topology

AS33667 CMCS

Unclassified ARIN

Upstreams 2 carry this network
Downstreams 141 this network carries
Adjacent (IPv4) 137
Adjacent (IPv6) 17
Upstream graph Who carries AS33667, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS33667 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS33667: 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 IPv62,839
AS3356Level 3 Parent, LLCTransitIPv4 IPv61,024

Transit

Downstream networks

All 141

Networks for which AS33667 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS23338ASN-DCS-01HostingIPv41,140
AS2894California Department of Water ResourcesUnclassifiedIPv4514
AS11620Succeed.NetResidentialIPv4394
AS32688THE GOLDEN 1 CREDIT UNIONUnclassifiedIPv4296
AS46341California Public Utilities CommissionUnclassifiedIPv4257
AS396513County of FresnoUnclassifiedIPv4240
AS25753California Public Employees' Retirement SystemUnclassifiedIPv4235
AS11829Cadence Design Systems, Inc.UnclassifiedIPv4225
AS20940Akamai International B.V.HostingIPv4 IPv6209
AS46867SebastianUnclassifiedIPv4206

All 141 downstreams →

Adjacency

Adjacent networks

All 143

Every AS seen directly next to AS33667 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS7922Comcast Cable Communications, LLCResidentialIPv4 IPv67,072
AS3356Level 3 Parent, LLCTransitIPv4 IPv65,153
AS23338ASN-DCS-01HostingIPv41,221
AS2894California Department of Water ResourcesUnclassifiedIPv4514
AS11620Succeed.NetResidentialIPv4394
AS32688THE GOLDEN 1 CREDIT UNIONUnclassifiedIPv4296
AS46341California Public Utilities CommissionUnclassifiedIPv4257
AS396513County of FresnoUnclassifiedIPv4240
AS25753California Public Employees' Retirement SystemUnclassifiedIPv4235
AS11829Cadence Design Systems, Inc.UnclassifiedIPv4225

All 143 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-16 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.23M 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.