asn.dev

Observed topology

AS4538 ERX-CERNET-BKB - China Education and Research Network Center

Education RIPE Educational/Research

Upstreams 22 carry this network
Downstreams 23 this network carries
Adjacent (IPv4) 41
Adjacent (IPv6) 13
Upstream graph Who carries AS4538, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS4538 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 22

Networks observed carrying traffic for AS4538: 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
AS23764CTGNetUnclassifiedIPv437,989
AS4837CHINA UNICOM China169 BackboneMobileIPv411,014
AS4134No.31,Jin-rong StreetResidentialIPv4 IPv610,392
AS6939Hurricane Electric LLCTransitIPv4 IPv63,801
AS2914NTT America, Inc.TransitIPv4 IPv62,356
AS4635Hong Kong Internet Exchange--Route Server 1UnclassifiedIPv42,138
AS1299Arelion Sweden ABTransitIPv4 IPv61,148
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv6947
AS140570Hong Kong Beecloud System Technology Services LimitedHostingIPv4746
AS174Cogent Communications, LLCTransitIPv4 IPv6707

All 22 upstreams →

Transit

Downstream networks

All 23

Networks for which AS4538 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS133111CERNET New Technology Co., LtdUnclassifiedIPv4177
AS139139Shenyang Agricultural UniversityUnclassifiedIPv4177
AS9405Test platform Service CenterUnclassifiedIPv4173
AS24348CERNET2 IX at Tsinghua UniversityUnclassifiedIPv4106
AS151229Shenyang Aerospace UniversityUnclassifiedIPv479
AS24357CERNET2 IX at South China University of TechnologyUnclassifiedIPv466
AS24310Net-Glyph Data CenterUnclassifiedIPv462
AS24364CERNET2 IX at Shanghai Jiaotong UniversityUnclassifiedIPv461
AS134169CERNEWTECH (Beijing) co.,LTDUnclassifiedIPv461
AS133465Duke Kunshan UniversityUnclassifiedIPv426

All 23 downstreams →

Adjacency

Adjacent networks

All 43

Every AS seen directly next to AS4538 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS23764CTGNetUnclassifiedIPv437,989
AS4134No.31,Jin-rong StreetResidentialIPv4 IPv611,858
AS4837CHINA UNICOM China169 BackboneMobileIPv411,017
AS6939Hurricane Electric LLCTransitIPv4 IPv63,905
AS2914NTT America, Inc.TransitIPv4 IPv62,395
AS4635Hong Kong Internet Exchange--Route Server 1UnclassifiedIPv42,138
AS23910China Next Generation Internet CERNET2UnclassifiedIPv61,552
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv61,286
AS1299Arelion Sweden ABTransitIPv4 IPv61,191
AS174Cogent Communications, LLCTransitIPv4 IPv6986

All 43 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-08 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.00M 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.