asn.dev

Observed topology

AS21574 AS21574 - Century Telecom Ltda

Unclassified LACNIC

Upstreams 9 carry this network
Downstreams 106 this network carries
Adjacent (IPv4) 113
Adjacent (IPv6) 93
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
AS3356Level 3 Parent, LLCTransitIPv4 IPv6198
AS6939Hurricane Electric LLCTransitIPv459
AS263444Open X Tecnologia LtdaUnclassifiedIPv621
AS7195EDGEUNO S.A.SUnclassifiedIPv610
AS16735ALGAR TELECOM S/AUnclassifiedIPv48
AS24482SG.GSHostingIPv4 IPv66
AS37721Virtual Technologies & SolutionsResidentialIPv45
AS267613ELETRONET S.A.UnclassifiedIPv62
AS35280F5 Networks SARLHostingIPv41

Transit

Downstream networks

All 106

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

ASNetworkTypeFamiliesPaths seen
AS53139RDF Informatica LtdaResidentialIPv4 IPv61,572
AS263356CNT FiberUnclassifiedIPv4 IPv6967
AS262566Link Sete Servicos de Internet e Redes LtdaUnclassifiedIPv4 IPv6596
AS61707SYSVOIP TELECOMUNICACOES LTDA - MEUnclassifiedIPv4 IPv6595
AS271338TITAM NET TELECOMUnclassifiedIPv4 IPv6568
AS263277Rnet Informatica LtdaResidentialIPv4 IPv6509
AS262387Intermicro LtdaUnclassifiedIPv4 IPv6502
AS270564MASTER DA WEB DATACENTER LTDAHostingIPv4 IPv6480
AS267357Livenet telecomUnclassifiedIPv4 IPv6461
AS61712YUPNET TELECOMUNICACOES LTDAResidentialIPv4 IPv6458

All 106 downstreams →

Adjacency

Adjacent networks

All 120

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

ASNetworkTypeFamiliesPaths seen
AS7195EDGEUNO S.A.SUnclassifiedIPv4 IPv68,945
AS263444Open X Tecnologia LtdaUnclassifiedIPv4 IPv67,792
AS3356Level 3 Parent, LLCTransitIPv4 IPv63,661
AS61712YUPNET TELECOMUNICACOES LTDAResidentialIPv4 IPv62,338
AS6939Hurricane Electric LLCTransitIPv4 IPv61,769
AS267613ELETRONET S.A.UnclassifiedIPv4 IPv61,765
AS53139RDF Informatica LtdaResidentialIPv4 IPv61,572
AS1031PEER 1031 LLCUnclassifiedIPv41,392
AS263356CNT FiberUnclassifiedIPv4 IPv6967
AS52928NORTETEL TELECOMUNICACOES LTDAUnclassifiedIPv4 IPv6850

All 120 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-03 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.45M 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.