asn.dev

Observed topology

AS18723 SEAGATE-USA-CA-1 - Seagate Technology LLC

Unclassified ARIN

Upstreams 7 carry this network
Downstreams 2 this network carries
Adjacent (IPv4) 9
Adjacent (IPv6) 0
Upstream graph Who carries AS18723, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS18723 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS18723: 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, LLCTransitIPv4859
AS3257GTT Communications Inc.TransitIPv4223
AS45458SBN-ISP/AWN-ISP and SBN-NIX/AWN-NIXUnclassifiedIPv4119
AS9255Singapore TelecomUnclassifiedIPv460
AS9498BHARTI Airtel Ltd.MobileIPv448
AS2687AT&T Enterprises, LLCUnclassifiedIPv413
AS5580GTT Communications Netherlands B.V.TransitIPv47

Transit

Downstream networks

inferred

Networks for which AS18723 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS65007unnamedUnclassifiedIPv41
AS65044unnamedUnclassifiedIPv41

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS18723 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3356Level 3 Parent, LLCTransitIPv4859
AS3257GTT Communications Inc.TransitIPv4223
AS45458SBN-ISP/AWN-ISP and SBN-NIX/AWN-NIXUnclassifiedIPv4121
AS9255Singapore TelecomUnclassifiedIPv460
AS9498BHARTI Airtel Ltd.MobileIPv448
AS2687AT&T Enterprises, LLCUnclassifiedIPv413
AS5580GTT Communications Netherlands B.V.TransitIPv47
AS65007unnamedUnclassifiedIPv41
AS65044unnamedUnclassifiedIPv41

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-14 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.46M 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.