Observed topology

AS29003 REFERTELECOM-AS IP TELECOM, SERVICOS DE TELECOMUNICACOES S.A.

Unclassified RIPE Cable/DSL/ISP

Upstreams 5 carry this network

Downstreams 5 this network carries

Adjacent (IPv4) 9

Adjacent (IPv6) 5

Upstream graph Who carries AS29003, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS29003 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS29003: 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.

AS	Network	Type	Families	Paths seen
AS174	Cogent Communications, LLC	Transit	IPv4 IPv6	92
AS6939	Hurricane Electric LLC	Transit	IPv4 IPv6	64
AS3257	GTT Communications Inc.	Transit	IPv4 IPv6	46
AS12353	Communicacoes Pessoais S.A.	Mobile	IPv4	9
AS37721	Virtual Technologies & Solutions	Residential	IPv4	3

Transit

Downstream networks

inferred

Networks for which AS29003 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS41962	MIGUEL GONCALVES UNIPESSOAL LDA	Unclassified	IPv4	96
AS199993	Associacao DNS.PT	Unclassified	IPv4 IPv6	75
AS209440	Gabinete Nacional de Seguranca (GNS)	Unclassified	IPv4	59
AS205558	Autoridade Nacional de Comunicacoes (Anacom)	Unclassified	IPv6	34
AS199016	VISUALFORMA TECNOLOGIAS DE INFORMACAO, SA	Unclassified	IPv4	19

Adjacency

Adjacent networks

observed

Every AS seen directly next to AS29003 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS174	Cogent Communications, LLC	Transit	IPv4 IPv6	218
AS6939	Hurricane Electric LLC	Transit	IPv4 IPv6	137
AS3257	GTT Communications Inc.	Transit	IPv4 IPv6	120
AS41962	MIGUEL GONCALVES UNIPESSOAL LDA	Unclassified	IPv4	96
AS199993	Associacao DNS.PT	Unclassified	IPv4 IPv6	75
AS209440	Gabinete Nacional de Seguranca (GNS)	Unclassified	IPv4	59
AS205558	Autoridade Nacional de Comunicacoes (Anacom)	Unclassified	IPv6	34
AS199016	VISUALFORMA TECNOLOGIAS DE INFORMACAO, SA	Unclassified	IPv4	19
AS12353	Communicacoes Pessoais S.A.	Mobile	IPv4	12
AS37721	Virtual Technologies & Solutions	Residential	IPv4	10

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.