asn.dev

Observed topology

AS1103 SURFNET-NL SURF B.V.

Unclassified RIPE Educational/Research

Upstreams 30 carry this network
Downstreams 325 this network carries
Adjacent (IPv4) 425
Adjacent (IPv6) 274
Upstream graph Who carries AS1103, and who carries them, drawn as a map up to the transit-free core. 5 exchanges Where AS1103 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 30

Networks observed carrying traffic for AS1103: 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
AS6830Liberty Global Europe Holding B.V.ResidentialIPv4 IPv61,523
AS20562Broadband Hosting B.V.HostingIPv4 IPv6801
AS3257GTT Communications Inc.TransitIPv4 IPv6775
AS6939Hurricane Electric LLCTransitIPv4 IPv6727
AS11537Internet2UnclassifiedIPv4297
AS50304Blix Solutions ASUnclassifiedIPv4 IPv6204
AS9002RETN LimitedUnclassifiedIPv4 IPv6202
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv6103
AS17639Converge ICT Solutions Inc.UnclassifiedIPv4 IPv6103
AS24482SG.GSHostingIPv4 IPv6103

All 30 upstreams →

Transit

Downstream networks

All 325

Networks for which AS1103 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS7552Viettel GroupMobileIPv4 IPv64,033
AS3257GTT Communications Inc.TransitIPv4 IPv61,801
AS1104Stichting Nederlandse Wetenschappelijk Onderzoek InstitutenUnclassifiedIPv4 IPv6855
AS2907Research Organization of Information and Systems, National Institute of InformaticsUnclassifiedIPv4 IPv6605
AS6057Administracion Nacional de TelecomunicacionesResidentialIPv4575
AS12322Free SASResidentialIPv4538
AS7497Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS)EducationIPv4470
AS45899VNPT CorpMobileIPv4 IPv6423
AS2018Tertiary Education and Research Network of South AfricaUnclassifiedIPv4 IPv6358
AS137409GSL Networks Pty LTDUnclassifiedIPv4 IPv6355

All 325 downstreams →

Adjacency

Adjacent networks

All 425

Every AS seen directly next to AS1103 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv693,441
AS3257GTT Communications Inc.TransitIPv4 IPv617,003
AS9498BHARTI Airtel Ltd.MobileIPv47,394
AS20562Broadband Hosting B.V.HostingIPv4 IPv66,035
AS4230CLARO S.A.ResidentialIPv4 IPv65,479
AS7552Viettel GroupMobileIPv4 IPv65,221
AS11537Internet2UnclassifiedIPv4 IPv64,038
AS7195EDGEUNO S.A.SUnclassifiedIPv4 IPv63,546
AS6830Liberty Global Europe Holding B.V.ResidentialIPv4 IPv62,311
AS7473Singapore Telecommunications LtdUnclassifiedIPv4 IPv62,233

All 425 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-13 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.40M 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.