asn.dev

Observed topology

AS37963 ALIBABA-CN-NET Hangzhou Alibaba Advertising Co.,Ltd.

Hosting APNIC

Upstreams 17 carry this network
Downstreams 0 this network carries
Adjacent (IPv4) 17
Adjacent (IPv6) 13
Upstream graph Who carries AS37963, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS37963 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 17

Networks observed carrying traffic for AS37963: 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
AS4811China Telecom (Group)ResidentialIPv4 IPv612,968
AS4837CHINA UNICOM China169 BackboneMobileIPv4 IPv69,087
AS58461No.288,Fu-chun RoadHostingIPv4 IPv64,938
AS23724IDC, China Telecommunications CorporationUnclassifiedIPv4 IPv64,642
AS4816China Telecom (Group)HostingIPv4 IPv63,988
AS17621China Unicom Shanghai networkUnclassifiedIPv4 IPv62,216
AS4808China Unicom Beijing Province NetworkResidentialIPv4 IPv61,782
AS136195Qingdao, Shandong Province, P.R.China.UnclassifiedIPv4 IPv61,616
AS135061China Unicom Guangdong IP networkUnclassifiedIPv4 IPv61,314
AS56041China Mobile communications corporationUnclassifiedIPv4 IPv61,086

All 17 upstreams →

Transit

Downstream networks

inferred

Networks for which AS37963 was observed as the last hop before the origin, meaning it appears to provide them transit.

No downstream observed. This network does not appear to carry transit for anyone.

Adjacency

Adjacent networks

All 17

Every AS seen directly next to AS37963 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS4811China Telecom (Group)ResidentialIPv4 IPv612,968
AS4837CHINA UNICOM China169 BackboneMobileIPv4 IPv69,087
AS58461No.288,Fu-chun RoadHostingIPv4 IPv64,938
AS23724IDC, China Telecommunications CorporationUnclassifiedIPv4 IPv64,642
AS4816China Telecom (Group)HostingIPv4 IPv63,988
AS17621China Unicom Shanghai networkUnclassifiedIPv4 IPv62,216
AS4808China Unicom Beijing Province NetworkResidentialIPv4 IPv61,782
AS136195Qingdao, Shandong Province, P.R.China.UnclassifiedIPv4 IPv61,616
AS135061China Unicom Guangdong IP networkUnclassifiedIPv4 IPv61,314
AS56041China Mobile communications corporationUnclassifiedIPv4 IPv61,086

All 17 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.