asn.dev

Observed topology

AS267521 ULTRANET NETWORK

Residential LACNIC Cable/DSL/ISP

Upstreams 5 carry this network
Downstreams 4 this network carries
Adjacent (IPv4) 10
Adjacent (IPv6) 8
Upstream graph Who carries AS267521, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS267521 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS267521: 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
AS23106TOWER DO BRASIL-COMUNICACAO MULTIMIDIA LTUnclassifiedIPv4 IPv6173
AS13786Seabras 1 USA, LLCUnclassifiedIPv4 IPv679
AS24482SG.GSHostingIPv4 IPv611
AS35280F5 Networks SARLHostingIPv4 IPv610
AS37721Virtual-Technologies-Solutions-SAResidentialIPv4 IPv610

Transit

Downstream networks

inferred

Networks for which AS267521 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS266313MEUnclassifiedIPv4129
AS269500TECNOLOGIA E COMUNICACAO LTDAUnclassifiedIPv4 IPv6122
AS262663TELECOMUNICACOES LTDAUnclassifiedIPv4 IPv696
AS269425TELECOMUNICACOES EIRELIUnclassifiedIPv494

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS267521 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS23106TOWER DO BRASIL-COMUNICACAO MULTIMIDIA LTUnclassifiedIPv4 IPv6422
AS13786Seabras 1 USA, LLCUnclassifiedIPv4 IPv6222
AS266313MEUnclassifiedIPv4129
AS269500TECNOLOGIA E COMUNICACAO LTDAUnclassifiedIPv4 IPv6122
AS262663TELECOMUNICACOES LTDAUnclassifiedIPv4 IPv696
AS269425TELECOMUNICACOES EIRELIUnclassifiedIPv494
AS6939Hurricane Electric LLCTransitIPv4 IPv641
AS24482SG.GSHostingIPv4 IPv615
AS35280F5 Networks SARLHostingIPv4 IPv612
AS37721Virtual-Technologies-Solutions-SAResidentialIPv4 IPv612

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-27 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.06M 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.