asn.dev

Observed topology

AS33668 CMCS - Comcast Cable Communications, LLC

Residential ARIN

Upstreams 2 carry this network
Downstreams 64 this network carries
Adjacent (IPv4) 66
Adjacent (IPv6) 4
Upstream graph Who carries AS33668, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS33668 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS33668: 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 IPv63,532
AS3356Level 3 Parent, LLCTransitIPv4 IPv6109

Transit

Downstream networks

All 64

Networks for which AS33668 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS26463Macomb Intermediate School DistrictUnclassifiedIPv41,703
AS62658City of WyandotteUnclassifiedIPv4819
AS33372Spartan Stores Inc.UnclassifiedIPv4720
AS394446Newaygo County Regional Educational Service AgencyUnclassifiedIPv4417
AS10351Enertron L.L.C.UnclassifiedIPv4236
AS19880REALCOMP II LTD.UnclassifiedIPv4192
AS393256DTE Energy CompanyUnclassifiedIPv4 IPv6182
AS53352Henry Ford Health SystemUnclassifiedIPv4143
AS13325Michigan State GovernmentUnclassifiedIPv4134
AS11115Otava, LLCHostingIPv4121

All 64 downstreams →

Adjacency

Adjacent networks

All 66

Every AS seen directly next to AS33668 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS7922Comcast Cable Communications, LLCResidentialIPv4 IPv68,243
AS3356Level 3 Parent, LLCTransitIPv4 IPv61,995
AS26463Macomb Intermediate School DistrictUnclassifiedIPv41,703
AS62658City of WyandotteUnclassifiedIPv4819
AS33372Spartan Stores Inc.UnclassifiedIPv4720
AS394446Newaygo County Regional Educational Service AgencyUnclassifiedIPv4417
AS10351Enertron L.L.C.UnclassifiedIPv4236
AS19880REALCOMP II LTD.UnclassifiedIPv4192
AS393256DTE Energy CompanyUnclassifiedIPv4 IPv6182
AS53352Henry Ford Health SystemUnclassifiedIPv4143

All 66 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.