asn.dev

Observed topology

AS7660 APAN-JP Asia Pacific Advanced Network - Japan

Unclassified APNIC

Upstreams 7 carry this network
Downstreams 17 this network carries
Adjacent (IPv4) 21
Adjacent (IPv6) 11
Upstream graph Who carries AS7660, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS7660 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS7660: 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
AS2516KDDI CORPORATIONMobileIPv4 IPv6146
AS6939Hurricane Electric LLCTransitIPv420
AS2907Research Organization of Information and Systems, National Institute of InformaticsUnclassifiedIPv4 IPv614
AS2500WIDE ProjectUnclassifiedIPv46
AS11537Internet2UnclassifiedIPv44
AS24482SG.GSHostingIPv4 IPv64
AS24287National Institute of InformaticsUnclassifiedIPv42

Transit

Downstream networks

All 17

Networks for which AS7660 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS2907Research Organization of Information and Systems, National Institute of InformaticsUnclassifiedIPv4668
AS7497Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS)EducationIPv4465
AS9270National Infomation Society AgencyEducationIPv469
AS17579KISTIEducationIPv426
AS11537Internet2UnclassifiedIPv424
AS4538China Education and Research Network CenterEducationIPv420
AS2500WIDE ProjectUnclassifiedIPv4 IPv619
AS24475ThaiREN.Thailand Research and Education Network ThailandUnclassifiedIPv416
AS9821Department of Science and TechnologyEducationIPv4 IPv614
AS23911China Next Generation Internet Beijing IXUnclassifiedIPv44

All 17 downstreams →

Adjacency

Adjacent networks

All 21

Every AS seen directly next to AS7660 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS11537Internet2UnclassifiedIPv4 IPv616,119
AS23855Singapore Advanced Research and Education NetworkUnclassifiedIPv4 IPv63,301
AS24475ThaiREN.Thailand Research and Education Network ThailandUnclassifiedIPv42,052
AS24490Trans-Eurasia Information Network (TEIN2) - SGUnclassifiedIPv41,590
AS2907Research Organization of Information and Systems, National Institute of InformaticsUnclassifiedIPv4 IPv61,149
AS23911China Next Generation Internet Beijing IXUnclassifiedIPv4 IPv6902
AS9264Academia SinicaEducationIPv4 IPv6688
AS7497Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS)EducationIPv4584
AS17579KISTIEducationIPv4 IPv6514
AS24287National Institute of InformaticsUnclassifiedIPv4 IPv6500

All 21 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-31 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.50M 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.