asn.dev

Observed topology

AS21574 AS21574 - Century Telecom Ltda

Unclassified LACNIC

Upstreams 9 carry this network
Downstreams 103 this network carries
Adjacent (IPv4) 105
Adjacent (IPv6) 89
Upstream graph Who carries AS21574, and who carries them, drawn as a map up to the transit-free core. 7 exchanges Where AS21574 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS21574: 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
AS263444Open X Tecnologia LtdaUnclassifiedIPv4 IPv6140
AS3356Level 3 Parent, LLCTransitIPv4 IPv662
AS6939Hurricane Electric LLCTransitIPv442
AS13786Seabras 1 USA, LLCUnclassifiedIPv4 IPv630
AS7195EDGEUNO S.A.SUnclassifiedIPv69
AS24482SG.GSHostingIPv4 IPv66
AS35280F5 Networks SARLHostingIPv41
AS37721Virtual Technologies & SolutionsResidentialIPv41
AS267613ELETRONET S.A.UnclassifiedIPv61

Transit

Downstream networks

All 103

Networks for which AS21574 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS262566Link Sete Servicos de Internet e Redes LtdaUnclassifiedIPv4 IPv6671
AS263356CNT FiberUnclassifiedIPv4 IPv6613
AS53139RDF Informatica LtdaResidentialIPv4 IPv6564
AS61712YUPNET TELECOMUNICACOES LTDAResidentialIPv4 IPv6549
AS271338TITAM NET TELECOMUnclassifiedIPv4 IPv6495
AS262674Conquest Telecomunicacoes LtdaResidentialIPv4 IPv6474
AS262624INETSAFE COMERCIO DE EQUIPAMENTOS ELETRONICOS LTDAUnclassifiedIPv4 IPv6453
AS267070Fibranet Juiz de Fora Servicos de TelecomunicacoesUnclassifiedIPv4406
AS262387Intermicro LtdaUnclassifiedIPv4 IPv6383
AS263277Rnet Informatica LtdaResidentialIPv4 IPv6370

All 103 downstreams →

Adjacency

Adjacent networks

All 117

Every AS seen directly next to AS21574 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS263444Open X Tecnologia LtdaUnclassifiedIPv4 IPv66,922
AS7195EDGEUNO S.A.SUnclassifiedIPv4 IPv65,678
AS61712YUPNET TELECOMUNICACOES LTDAResidentialIPv4 IPv62,628
AS267613ELETRONET S.A.UnclassifiedIPv4 IPv62,113
AS6939Hurricane Electric LLCTransitIPv4 IPv61,028
AS13786Seabras 1 USA, LLCUnclassifiedIPv4 IPv6927
AS3356Level 3 Parent, LLCTransitIPv4 IPv6879
AS52928NORTETEL TELECOMUNICACOES LTDAUnclassifiedIPv4 IPv6871
AS1031PEER 1031 LLCUnclassifiedIPv4838
AS262566Link Sete Servicos de Internet e Redes LtdaUnclassifiedIPv4 IPv6763

All 117 adjacent →

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.