asn.dev

Observed topology

AS45903 CMCTELECOM-VN CMC Telecom Infrastructure Company

Residential APNIC Cable/DSL/ISP

Upstreams 50 carry this network
Downstreams 102 this network carries
Adjacent (IPv4) 158
Adjacent (IPv6) 49
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 50

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 IPv67,023
AS3491PCCW Global (HK) Ltd.TransitIPv43,856
AS15412Flag Telecom UK LimitedUnclassifiedIPv4 IPv63,226
AS2914NTT America, Inc.TransitIPv4 IPv62,799
AS21859Zenlayer IncHostingIPv41,251
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6814
AS7473Singapore Telecommunications LtdUnclassifiedIPv4630
AS6939Hurricane Electric LLCTransitIPv4 IPv6527
AS4766Korea TelecomMobileIPv4 IPv6521
AS3356Level 3 Parent, LLCTransitIPv4 IPv6484

All 50 upstreams →

Transit

Downstream networks

All 102

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 IPv63,091
AS38732CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv62,640
AS45544SUPERDATA-VNUnclassifiedIPv4 IPv62,033
AS38733CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv61,827
AS38247Vietnamobile Telecommunications Joint Stock CompanyUnclassifiedIPv4 IPv61,145
AS55309Minh Tu Telecom Limited CompanyUnclassifiedIPv4 IPv61,082
AS138995Antbox Networks LimitedHostingIPv4732
AS154552XYLENTIS COMPANY LIMITEDUnclassifiedIPv4 IPv6622
AS131410Vietnam Cable Television Corporation Joint Stock CompanyUnclassifiedIPv4618
AS135983Tino Group Joint Stock CompanyUnclassifiedIPv4 IPv6596

All 102 downstreams →

Adjacency

Adjacent networks

All 163

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

ASNetworkTypeFamiliesPaths seen
AS9304HGC Global Communications LimitedHostingIPv4 IPv618,890
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv611,994
AS15412Flag Telecom UK LimitedUnclassifiedIPv4 IPv68,982
AS2914NTT America, Inc.TransitIPv4 IPv67,553
AS38733CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv65,914
AS38732CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv65,238
AS45538ODS Joint Stock CompanyUnclassifiedIPv4 IPv63,175
AS21859Zenlayer IncHostingIPv42,458
AS135983Tino Group Joint Stock CompanyUnclassifiedIPv4 IPv62,313
AS45544SUPERDATA-VNUnclassifiedIPv4 IPv62,033

All 163 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.