asn.dev

Observed topology

AS3662 HARNET - Joint Universities Computer Centre Limited

Education APNIC

Upstreams 6 carry this network
Downstreams 9 this network carries
Adjacent (IPv4) 16
Adjacent (IPv6) 11
Upstream graph Who carries AS3662, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS3662 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS3662: 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
AS17824Pacific One Net Limited AS numberUnclassifiedIPv4273
AS6939Hurricane Electric LLCTransitIPv4 IPv6131
AS137207Joint Universities Computer Centre LimitedUnclassifiedIPv4 IPv643
AS4635Hong Kong Internet Exchange--Route Server 1UnclassifiedIPv414
AS24482SG.GSHostingIPv4 IPv69
AS8359MTS PJSCMobileIPv47

Transit

Downstream networks

inferred

Networks for which AS3662 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS7650The Education University of Hong KongEducationIPv4 IPv61,347
AS7651Lingnan UniversityEducationIPv4 IPv6717
AS3363Hong Kong University of Science and TechnologyEducationIPv4 IPv6610
AS4158City University of Hong KongEducationIPv4 IPv6457
AS4528The University of Hong KongEducationIPv4 IPv6447
AS4605Hong Kong Baptist UniversityEducationIPv4 IPv6395
AS4616The Hong Kong Polytechnic UniversityEducationIPv4 IPv6331
AS3661The Chinese University of Hong KongEducationIPv4308
AS17764Hong Kong Metropolitan UniversityUnclassifiedIPv4178

Adjacency

Adjacent networks

All 16

Every AS seen directly next to AS3662 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS17824Pacific One Net Limited AS numberUnclassifiedIPv43,378
AS7650The Education University of Hong KongEducationIPv4 IPv61,347
AS6939Hurricane Electric LLCTransitIPv4 IPv61,174
AS7651Lingnan UniversityEducationIPv4 IPv6717
AS3363Hong Kong University of Science and TechnologyEducationIPv4 IPv6610
AS4158City University of Hong KongEducationIPv4 IPv6457
AS4528The University of Hong KongEducationIPv4 IPv6447
AS4605Hong Kong Baptist UniversityEducationIPv4 IPv6395
AS4616The Hong Kong Polytechnic UniversityEducationIPv4 IPv6331
AS3661The Chinese University of Hong KongEducationIPv4308

All 16 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-10 10:00 UTC by route-views2,rrc00, as seen from 74 BGP vantage points across 71.97M 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.