asn.dev

Observed topology

AS81 NCREN

Unclassified ARIN Educational/Research

Upstreams 7 carry this network
Downstreams 39 this network carries
Adjacent (IPv4) 46
Adjacent (IPv6) 11
Upstream graph Who carries AS81, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS81 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS81: 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 IPv62,980
AS174Cogent Communications, LLCTransitIPv4 IPv62,898
AS11426Charter Communications IncResidentialIPv41,317
AS11537Internet2UnclassifiedIPv4 IPv6784
AS7018AT&T Enterprises, LLCResidentialIPv4 IPv6255
AS11164Internet2EducationIPv4 IPv6204
AS6461Zayo BandwidthTransitIPv431

Transit

Downstream networks

All 39

Networks for which AS81 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS46255Charlotte-Mecklenburg SchoolsUnclassifiedIPv42,068
AS19413Roanoke ConnectUnclassifiedIPv41,111
AS36850University of North Carolina at Chapel HillUnclassifiedIPv4 IPv6596
AS6559State of NC - State Telecommunications ServicesUnclassifiedIPv4551
AS13371Duke UniversityUnclassifiedIPv4 IPv6373
AS11442North Carolina State UniversityEducationIPv4 IPv6287
AS396028Vidant HealthUnclassifiedIPv4281
AS10952East Carolina UniversityEducationIPv4185
AS398580Queens University of CharlotteUnclassifiedIPv4182
AS396391Guilford CollegeUnclassifiedIPv4124

All 39 downstreams →

Adjacency

Adjacent networks

All 46

Every AS seen directly next to AS81 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3356Level 3 Parent, LLCTransitIPv4 IPv66,120
AS174Cogent Communications, LLCTransitIPv4 IPv65,974
AS46255Charlotte-Mecklenburg SchoolsUnclassifiedIPv42,068
AS11426Charter Communications IncResidentialIPv41,402
AS11537Internet2UnclassifiedIPv4 IPv61,295
AS19413Roanoke ConnectUnclassifiedIPv41,111
AS7018AT&T Enterprises, LLCResidentialIPv4 IPv6727
AS36850University of North Carolina at Chapel HillUnclassifiedIPv4 IPv6596
AS6559State of NC - State Telecommunications ServicesUnclassifiedIPv4551
AS11164Internet2EducationIPv4 IPv6425

All 46 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-12 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.21M 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.