asn.dev

Observed topology

AS1251 AS1251 - FUNDACAO DE AMPARO A PESQUISA DO ESTADO SAO PAULO

Unclassified LACNIC Educational/Research

Upstreams 6 carry this network
Downstreams 14 this network carries
Adjacent (IPv4) 20
Adjacent (IPv6) 9
Upstream graph Who carries AS1251, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS1251 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS1251: 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
AS15830Equinix (EMEA) Acquisition Enterprises B.V.HostingIPv4 IPv61,259
AS20080Florida International UniversityUnclassifiedIPv4 IPv6830
AS6939Hurricane Electric LLCTransitIPv4373
AS24482SG.GSHostingIPv4 IPv635
AS37721Virtual Technologies & SolutionsResidentialIPv434
AS1916Rede Nacional de Ensino e PesquisaUnclassifiedIPv415

Transit

Downstream networks

All 14

Networks for which AS1251 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS28571UNIVERSIDADE DE SAO PAULOEducationIPv4 IPv6620
AS52992UNIVERSIDADE FEDERAL DE SAO PAULOUnclassifiedIPv4320
AS53166UNIVERSIDADE ESTADUAL PAULISTAUnclassifiedIPv4 IPv6193
AS61612DEPARTAMENTO DE CIENCIA E TECNOLOGIA AEROESPACIALUnclassifiedIPv4189
AS52888UNIVERSIDADE FEDERAL DE SAO CARLOSEducationIPv4 IPv6112
AS52890Centro Integrado de Telematica do ExercitoUnclassifiedIPv4 IPv6105
AS271755UNIVERSIDADE DE SAO PAULOUnclassifiedIPv464
AS262742Fundacao Universidade Federal do ABC - UFABCUnclassifiedIPv4 IPv644
AS11097EMPRESA BRASILEIRA DE PESQUISA AGROPECUARIAUnclassifiedIPv4 IPv620
AS53187UNIVERSIDADE ESTADUAL DE CAMPINASUnclassifiedIPv418

All 14 downstreams →

Adjacency

Adjacent networks

All 20

Every AS seen directly next to AS1251 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS15830Equinix (EMEA) Acquisition Enterprises B.V.HostingIPv4 IPv62,048
AS20080Florida International UniversityUnclassifiedIPv4 IPv61,592
AS28571UNIVERSIDADE DE SAO PAULOEducationIPv4 IPv6620
AS6939Hurricane Electric LLCTransitIPv4483
AS52992UNIVERSIDADE FEDERAL DE SAO PAULOUnclassifiedIPv4320
AS53166UNIVERSIDADE ESTADUAL PAULISTAUnclassifiedIPv4 IPv6193
AS61612DEPARTAMENTO DE CIENCIA E TECNOLOGIA AEROESPACIALUnclassifiedIPv4189
AS52888UNIVERSIDADE FEDERAL DE SAO CARLOSEducationIPv4 IPv6112
AS52890Centro Integrado de Telematica do ExercitoUnclassifiedIPv4 IPv6105
AS271755UNIVERSIDADE DE SAO PAULOUnclassifiedIPv464

All 20 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-01 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.48M 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.