asn.dev

Observed topology

AS25577 C4L-AS

Hosting APNIC NSP

Upstreams 23 carry this network
Downstreams 10 this network carries
Adjacent (IPv4) 34
Adjacent (IPv6) 8
Upstream graph Who carries AS25577, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS25577 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 23

Networks observed carrying traffic for AS25577: 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
AS174Cogent Communications, LLCTransitIPv4952
AS3257GTT Communications Inc.TransitIPv4 IPv6613
AS6939Hurricane Electric LLCTransitIPv4 IPv6440
AS34549meerfarbig GmbH & Co. KGHostingIPv4135
AS3223Voxility LLPHostingIPv4118
AS50304Blix Solutions ASUnclassifiedIPv490
AS4637Telstra GlobalUnclassifiedIPv451
AS12552GlobalConnect ABUnclassifiedIPv449
AS3303Swisscom (Schweiz) AGResidentialIPv448
AS24482SG.GSHostingIPv4 IPv648

All 23 upstreams →

Transit

Downstream networks

inferred

Networks for which AS25577 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS31708Coreix LtdHostingIPv4 IPv61,400
AS49485High Availability Hosting LimitedHostingIPv4318
AS218531WallStreetDocs LtdUnclassifiedIPv4114
AS44934Arachsys Internet Services LtdUnclassifiedIPv4 IPv692
AS59493Cudo Ventures LtdUnclassifiedIPv4 IPv691
AS203035Xara Computers (UK) LtdUnclassifiedIPv478
AS205434BE SLOUGH DC UK LIMITEDUnclassifiedIPv477
AS50882Maxnett Ltd.UnclassifiedIPv458
AS51572Cerulean Solutions LimitedUnclassifiedIPv458
AS206626Professional Software Design LtdUnclassifiedIPv41

Adjacency

Adjacent networks

All 34

Every AS seen directly next to AS25577 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS31708Coreix LtdHostingIPv4 IPv62,237
AS174Cogent Communications, LLCTransitIPv41,835
AS3257GTT Communications Inc.TransitIPv4 IPv61,119
AS6939Hurricane Electric LLCTransitIPv4 IPv6910
AS34549meerfarbig GmbH & Co. KGHostingIPv4333
AS49485High Availability Hosting LimitedHostingIPv4318
AS50304Blix Solutions ASUnclassifiedIPv4201
AS24482SG.GSHostingIPv4 IPv6136
AS4637Telstra GlobalUnclassifiedIPv4126
AS50300CustodianDC LimitedUnclassifiedIPv4124

All 34 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-26 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.14M 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.