asn.dev

Observed topology

AS3561 CENTURYLINK-LEGACY-SAVVIS

Hosting ARIN

Upstreams 4 carry this network
Downstreams 42 this network carries
Adjacent (IPv4) 46
Adjacent (IPv6) 2
Upstream graph Who carries AS3561, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS3561 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS3561: 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 IPv638,441
AS58057Securebit AGUnclassifiedIPv4496
AS209CenturyLink Communications, LLCResidentialIPv4180
AS3910CenturyLink Communications, LLCUnclassifiedIPv4180

Transit

Downstream networks

All 42

Networks for which AS3561 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS6989Government Technology Services Inc.UnclassifiedIPv4541
AS21622PR NewswireUnclassifiedIPv4489
AS14524SERCO NAUnclassifiedIPv4360
AS19701Yodlee Inc.UnclassifiedIPv4240
AS63427Computer Design & Integration LLCUnclassifiedIPv4180
AS46263e-Dialog, IncUnclassifiedIPv4160
AS22064Refinitiv US LLCUnclassifiedIPv4120
AS32988Analog Devices, Inc.UnclassifiedIPv4120
AS40026DICK'S SPORTING GOODS INCUnclassifiedIPv4120
AS64212Advantage Sales & Marketing LLCUnclassifiedIPv4120

All 42 downstreams →

Adjacency

Adjacent networks

All 46

Every AS seen directly next to AS3561 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3356Level 3 Parent, LLCTransitIPv4 IPv642,154
AS6989Government Technology Services Inc.UnclassifiedIPv4541
AS58057Securebit AGUnclassifiedIPv4496
AS21622PR NewswireUnclassifiedIPv4489
AS14524SERCO NAUnclassifiedIPv4360
AS19701Yodlee Inc.UnclassifiedIPv4240
AS209CenturyLink Communications, LLCResidentialIPv4227
AS3910CenturyLink Communications, LLCUnclassifiedIPv4186
AS63427Computer Design & Integration LLCUnclassifiedIPv4180
AS46263e-Dialog, IncUnclassifiedIPv4160

All 46 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-20 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.16M 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.