asn.dev

Observed topology

AS1103 SURFNET-NL SURFnet, The Netherlands

Unclassified RIPE Educational/Research

Upstreams 31 carry this network
Downstreams 323 this network carries
Adjacent (IPv4) 427
Adjacent (IPv6) 276
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 31

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 IPv61,522
AS3257GTT Communications Inc.TransitIPv4767
AS6939Hurricane Electric LLCTransitIPv4 IPv6721
AS20562Broadband Hosting B.V.HostingIPv4 IPv6701
AS9002RETN LimitedUnclassifiedIPv4 IPv6300
AS11537Internet2UnclassifiedIPv4299
AS50304Blix Solutions ASUnclassifiedIPv4 IPv6204
AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)UnclassifiedIPv4 IPv6102
AS17639Converge ICT Solutions Inc.UnclassifiedIPv4 IPv6102
AS24482SG.GSHostingIPv4 IPv6102

All 31 upstreams →

Transit

Downstream networks

All 323

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

ASNetworkTypeFamiliesPaths seen
AS3257GTT Communications Inc.TransitIPv4 IPv61,785
AS1104Stichting Nederlandse Wetenschappelijk Onderzoek InstitutenUnclassifiedIPv4 IPv6850
AS2907Research Organization of Information and Systems, National Institute of InformaticsUnclassifiedIPv4 IPv6604
AS6057Administracion Nacional de TelecomunicacionesResidentialIPv4575
AS12322Free SASResidentialIPv4538
AS7497Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS)EducationIPv4468
AS45899VNPT CorpMobileIPv4 IPv6423
AS2018Tertiary Education and Research Network of South AfricaUnclassifiedIPv4 IPv6358
AS4800PT Aplikanusa LintasartaHostingIPv4324
AS18678INTERNEXA S.A. E.S.PUnclassifiedIPv4 IPv6309

All 323 downstreams →

Adjacency

Adjacent networks

All 427

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 IPv688,016
AS3257GTT Communications Inc.TransitIPv4 IPv617,762
AS9498BHARTI Airtel Ltd.MobileIPv4 IPv67,165
AS20562Broadband Hosting B.V.HostingIPv4 IPv66,070
AS4230CLARO S.A.ResidentialIPv4 IPv65,248
AS7195EDGEUNO S.A.SUnclassifiedIPv4 IPv64,120
AS11537Internet2UnclassifiedIPv4 IPv64,066
AS6830Liberty Global Europe Holding B.V.ResidentialIPv4 IPv62,322
AS1031PEER 1031 LLCUnclassifiedIPv4 IPv62,015
AS7473Singapore Telecommunications LtdUnclassifiedIPv4 IPv61,821

All 427 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-25 12:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.17M 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.