asn.dev

Observed topology

AS45903 CMCTELECOM-VN - CMC Telecom Infrastructure Company

Residential APNIC

Upstreams 49 carry this network
Downstreams 99 this network carries
Adjacent (IPv4) 155
Adjacent (IPv6) 48
Upstream graph Who carries AS45903, and who carries them, drawn as a map up to the transit-free core. 8 exchanges Where AS45903 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 49

Networks observed carrying traffic for AS45903: 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
AS9304HGC Global Communications LimitedHostingIPv4 IPv67,114
AS3491PCCW Global (HK) Ltd.TransitIPv43,406
AS15412Flag Telecom UK LimitedUnclassifiedIPv4 IPv63,062
AS2914NTT America, Inc.TransitIPv4 IPv62,700
AS21859Zenlayer IncHostingIPv41,222
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6811
AS7473Singapore Telecommunications LtdUnclassifiedIPv4627
AS6939Hurricane Electric LLCTransitIPv4 IPv6527
AS4766Korea TelecomMobileIPv4 IPv6502
AS24482SG.GSHostingIPv4 IPv6460

All 49 upstreams →

Transit

Downstream networks

All 99

Networks for which AS45903 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS45538ODS Joint Stock CompanyUnclassifiedIPv4 IPv63,042
AS38732CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv62,596
AS38733CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv61,777
AS45544SUPERDATA-VNUnclassifiedIPv4 IPv61,732
AS38247Vietnamobile Telecommunications Joint Stock CompanyUnclassifiedIPv4 IPv61,142
AS55309Minh Tu Telecom Limited CompanyUnclassifiedIPv4 IPv61,075
AS138995Antbox Networks LimitedHostingIPv4720
AS131410Vietnam Cable Television Corporation Joint Stock CompanyUnclassifiedIPv4610
AS135983Tino Group Joint Stock CompanyUnclassifiedIPv4 IPv6582
AS154552XYLENTIS COMPANY LIMITEDUnclassifiedIPv4 IPv6458

All 99 downstreams →

Adjacency

Adjacent networks

All 160

Every AS seen directly next to AS45903 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS9304HGC Global Communications LimitedHostingIPv4 IPv618,539
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv610,898
AS15412Flag Telecom UK LimitedUnclassifiedIPv4 IPv68,536
AS2914NTT America, Inc.TransitIPv4 IPv66,903
AS38733CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv65,856
AS38732CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv65,152
AS45538ODS Joint Stock CompanyUnclassifiedIPv4 IPv63,125
AS21859Zenlayer IncHostingIPv42,413
AS135983Tino Group Joint Stock CompanyUnclassifiedIPv4 IPv62,261
AS45544SUPERDATA-VNUnclassifiedIPv4 IPv61,732

All 160 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-11 10:00 UTC by route-views2,rrc00, as seen from 74 BGP vantage points across 73.24M 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.