asn.dev

Observed topology

AS4637 ASN-TELSTRA-GLOBAL Telstra Global

Unclassified APNIC NSP

Upstreams 48 carry this network
Downstreams 497 this network carries
Adjacent (IPv4) 548
Adjacent (IPv6) 201
Upstream graph Who carries AS4637, and who carries them, drawn as a map up to the transit-free core. 38 exchanges Where AS4637 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 48

Networks observed carrying traffic for AS4637: 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
AS1299Arelion Sweden ABTransitIPv47,353
AS3356Level 3 Parent, LLCTransitIPv4 IPv66,429
AS6939Hurricane Electric LLCTransitIPv4 IPv66,198
AS3257GTT Communications Inc.TransitIPv43,954
AS9002RETN LimitedUnclassifiedIPv4 IPv61,990
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv61,313
AS577Bell CanadaMobileIPv41,310
AS3303Swisscom (Schweiz) AGResidentialIPv41,288
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv61,161
AS6461Zayo BandwidthTransitIPv41,029

All 48 upstreams →

Transit

Downstream networks

All 497

Networks for which AS4637 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS1221Telstra LimitedMobileIPv4 IPv615,833
AS16509Amazon.com, Inc.HostingIPv47,245
AS19551Incapsula IncHostingIPv4 IPv66,501
AS18403FPT Telecom CompanyResidentialIPv4 IPv64,641
AS18186Nebula Global LLCHostingIPv4 IPv64,201
AS55547Unit D,E,F,G 28th FloorUnclassifiedIPv4 IPv64,180
AS38478SunnyVision LimitedHostingIPv43,976
AS20940Akamai International B.V.HostingIPv4 IPv63,577
AS10024LGA InternationalUnclassifiedIPv4 IPv63,249
AS2514NTT PC Communications, Inc.HostingIPv4 IPv63,021

All 497 downstreams →

Adjacency

Adjacent networks

All 548

Every AS seen directly next to AS4637 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS1221Telstra LimitedMobileIPv4 IPv6584,166
AS3356Level 3 Parent, LLCTransitIPv4 IPv6132,270
AS6939Hurricane Electric LLCTransitIPv4 IPv6112,180
AS6461Zayo BandwidthTransitIPv4 IPv686,698
AS3257GTT Communications Inc.TransitIPv4 IPv668,860
AS577Bell CanadaMobileIPv4 IPv660,788
AS1299Arelion Sweden ABTransitIPv4 IPv657,083
AS6762TELECOM ITALIA SPARKLE S.p.A.TransitIPv4 IPv656,955
AS4657StarHub LtdResidentialIPv451,439
AS64049Reliance Jio Infocomm Pte Ltd SingaporeUnclassifiedIPv4 IPv647,087

All 548 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-29 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.36M 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.