Observed topology

AS6223 CENTURYLINK-MTIPS1-STN

Unclassified ARIN

Upstreams 1 carry this network

Downstreams 7 this network carries

Adjacent (IPv4) 8

Adjacent (IPv6) 4

Upstream graph Who carries AS6223, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS6223 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS6223: 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.

AS	Network	Type	Families	Paths seen
AS209	CenturyLink Communications, LLC	Residential	IPv4 IPv6	251

Transit

Downstream networks

inferred

Networks for which AS6223 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS4155	USDA	Unclassified	IPv4 IPv6	728
AS3930	Federal Energy Regulatory Commission	Unclassified	IPv4	366
AS395700	Executive Office Of The President	Unclassified	IPv4 IPv6	250
AS102	U.S. National Science Foundation	Unclassified	IPv4 IPv6	217
AS11724	Comptroller of the Currency	Unclassified	IPv4	183
AS53554	National Credit Union Administration	Unclassified	IPv4	121
AS39983	Pension Benefit Guaranty Corp.	Unclassified	IPv4	61

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS6223 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS209	CenturyLink Communications, LLC	Residential	IPv4 IPv6	2,177
AS4155	USDA	Unclassified	IPv4 IPv6	728
AS3930	Federal Energy Regulatory Commission	Unclassified	IPv4	366
AS395700	Executive Office Of The President	Unclassified	IPv4 IPv6	250
AS102	U.S. National Science Foundation	Unclassified	IPv4 IPv6	217
AS11724	Comptroller of the Currency	Unclassified	IPv4	183
AS53554	National Credit Union Administration	Unclassified	IPv4	121
AS39983	Pension Benefit Guaranty Corp.	Unclassified	IPv4	61

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-30 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.49M 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.