asn.dev

Observed topology

AS27066 DNIC-ASBLK-27032-27159 - United States Department of Defense (DoD)

Unclassified ARIN

Upstreams 1 carry this network
Downstreams 31 this network carries
Adjacent (IPv4) 33
Adjacent (IPv6) 7
Upstream graph Who carries AS27066, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS27066 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS27066: 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
AS721United States Department of Defense (DoD)UnclassifiedIPv4 IPv66,903

Transit

Downstream networks

All 31

Networks for which AS27066 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS647United States Department of Defense (DoD)UnclassifiedIPv422,818
AS1600United States Department of Defense (DoD)UnclassifiedIPv4 IPv610,504
AS5972United States Department of Defense (DoD)UnclassifiedIPv49,211
AS1637Headquarters, USAISCUnclassifiedIPv4 IPv66,883
AS637United States Department of Defense (DoD)UnclassifiedIPv44,490
AS27046United States Department of Defense (DoD)UnclassifiedIPv43,897
AS1649Headquarters, USAISCUnclassifiedIPv4 IPv63,752
AS1516Headquarters, USAISCUnclassifiedIPv43,356
AS747Headquarters, USAISCUnclassifiedIPv42,259
AS27137United States Department of Defense (DoD)UnclassifiedIPv41,341

All 31 downstreams →

Adjacency

Adjacent networks

All 34

Every AS seen directly next to AS27066 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS721United States Department of Defense (DoD)UnclassifiedIPv4 IPv680,748
AS647United States Department of Defense (DoD)UnclassifiedIPv422,818
AS1600United States Department of Defense (DoD)UnclassifiedIPv4 IPv610,504
AS5972United States Department of Defense (DoD)UnclassifiedIPv49,211
AS1637Headquarters, USAISCUnclassifiedIPv4 IPv66,883
AS637United States Department of Defense (DoD)UnclassifiedIPv44,490
AS27046United States Department of Defense (DoD)UnclassifiedIPv43,897
AS1649Headquarters, USAISCUnclassifiedIPv4 IPv63,752
AS1516Headquarters, USAISCUnclassifiedIPv43,356
AS747Headquarters, USAISCUnclassifiedIPv4 IPv63,319

All 34 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-13 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.40M 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.