asn.dev

Observed topology

AS3737 AS-PTD

Residential ARIN

Upstreams 8 carry this network
Downstreams 35 this network carries
Adjacent (IPv4) 43
Adjacent (IPv6) 12
Upstream graph Who carries AS3737, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS3737 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS3737: 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
AS3356Level 3 Parent, LLCTransitIPv4 IPv6597
AS6461Zayo BandwidthTransitIPv4 IPv6500
AS3257GTT Communications Inc.TransitIPv4 IPv6262
AS6939Hurricane Electric LLCTransitIPv4 IPv6222
AS24482SG.GSHostingIPv4 IPv624
AS37721Virtual Technologies & SolutionsResidentialIPv4 IPv624
AS293ESnetUnclassifiedIPv423
AS58057Securebit AGUnclassifiedIPv44

Transit

Downstream networks

All 35

Networks for which AS3737 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS14369NmaxUnclassifiedIPv4 IPv6564
AS14928PenTeleData Inc.ResidentialIPv4 IPv6509
AS397369LVHNUnclassifiedIPv4330
AS27621AMERICAN COMPUTER ASSOCIATESUnclassifiedIPv4236
AS398191Tri-Co ConnectionsUnclassifiedIPv4220
AS22841Northampton Community CollegeUnclassifiedIPv4173
AS394893Clair GlobalUnclassifiedIPv4168
AS396269Buckeye Partners L.P.UnclassifiedIPv4118
AS396462LKQ CorporationUnclassifiedIPv4118
AS14789Cloudflare, Inc.UnclassifiedIPv4 IPv693

All 35 downstreams →

Adjacency

Adjacent networks

All 43

Every AS seen directly next to AS3737 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6461Zayo BandwidthTransitIPv4 IPv62,003
AS3356Level 3 Parent, LLCTransitIPv4 IPv61,919
AS3257GTT Communications Inc.TransitIPv4 IPv6998
AS6939Hurricane Electric LLCTransitIPv4 IPv6683
AS14369NmaxUnclassifiedIPv4 IPv6564
AS14928PenTeleData Inc.ResidentialIPv4 IPv6509
AS397369LVHNUnclassifiedIPv4330
AS27621AMERICAN COMPUTER ASSOCIATESUnclassifiedIPv4236
AS394893Clair GlobalUnclassifiedIPv4226
AS398191Tri-Co ConnectionsUnclassifiedIPv4220

All 43 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-19 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.17M 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.