asn.dev

Observed topology

AS13979 ATT-IPFR - AT&T Enterprises, LLC

Unclassified ARIN

Upstreams 1 carry this network
Downstreams 5 this network carries
Adjacent (IPv4) 10
Adjacent (IPv6) 8
Upstream graph Who carries AS13979, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS13979 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS13979: 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
AS30016North American Telecommunications CorporationUnclassifiedIPv424

Transit

Downstream networks

inferred

Networks for which AS13979 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS2576U. S. Department of TransportationUnclassifiedIPv4 IPv62,229
AS8076Department of Housing and Urban DevelopmentUnclassifiedIPv4 IPv6699
AS10616National Oceanic and Atmospheric AdministrationUnclassifiedIPv4 IPv6379
AS14298Environmental Protection AgencyUnclassifiedIPv4 IPv6267
AS395700Executive Office Of The PresidentUnclassifiedIPv4 IPv6124

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS13979 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS4473AT&T Enterprises, LLCUnclassifiedIPv4 IPv62,902
AS2576U. S. Department of TransportationUnclassifiedIPv4 IPv62,229
AS8076Department of Housing and Urban DevelopmentUnclassifiedIPv4 IPv6699
AS4185AT&T Enterprises, LLCUnclassifiedIPv4 IPv6391
AS3423AT&T Enterprises, LLCUnclassifiedIPv4 IPv6379
AS10616National Oceanic and Atmospheric AdministrationUnclassifiedIPv4 IPv6379
AS14298Environmental Protection AgencyUnclassifiedIPv4 IPv6267
AS395700Executive Office Of The PresidentUnclassifiedIPv4 IPv6124
AS4186AT&T Enterprises, LLCUnclassifiedIPv426
AS30016North American Telecommunications CorporationUnclassifiedIPv424

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-11 10:00 UTC by route-views2,rrc00, as seen from 74 BGP vantage points across 73.24M 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.