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
AS23764CTGNetUnclassifiedIPv437,889
AS4837CHINA UNICOM China169 BackboneMobileIPv410,963
AS4134No.31,Jin-rong StreetResidentialIPv4 IPv610,378
AS6939Hurricane Electric LLCTransitIPv4 IPv64,005
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv63,165
AS4635Hong Kong Internet Exchange--Route Server 1UnclassifiedIPv41,959
AS1299Arelion Sweden ABTransitIPv4 IPv61,151
AS2914NTT America, Inc.TransitIPv4 IPv6884
AS140570Hong Kong Beecloud System Technology Services LimitedHostingIPv4760
AS174Cogent Communications, LLCTransitIPv4 IPv6704

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 UniversityUnclassifiedIPv480
AS24357CERNET2 IX at South China University of TechnologyUnclassifiedIPv466
AS24310Net-Glyph Data CenterUnclassifiedIPv464
AS24364CERNET2 IX at Shanghai Jiaotong UniversityUnclassifiedIPv461
AS24361CERNET2 IX at Southeast UniversityUnclassifiedIPv449
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
AS23764CTGNetUnclassifiedIPv437,889
AS4134No.31,Jin-rong StreetResidentialIPv4 IPv611,843
AS4837CHINA UNICOM China169 BackboneMobileIPv410,966
AS6939Hurricane Electric LLCTransitIPv4 IPv64,112
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4 IPv63,475
AS4635Hong Kong Internet Exchange--Route Server 1UnclassifiedIPv41,959
AS23910China Next Generation Internet CERNET2UnclassifiedIPv61,554
AS1299Arelion Sweden ABTransitIPv4 IPv61,194
AS174Cogent Communications, LLCTransitIPv4 IPv61,017
AS23911China Next Generation Internet Beijing IXUnclassifiedIPv4 IPv6989

All 43 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-05 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 73.57M 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.