asn.dev

Observed topology

AS45903 CMCTELECOM-VN - CMC Telecom Infrastructure Company

Residential APNIC

Upstreams 48 carry this network
Downstreams 102 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 48

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 IPv67,039
AS3491PCCW Global (HK) Ltd.TransitIPv43,376
AS15412Flag Telecom UK LimitedUnclassifiedIPv4 IPv63,134
AS2914NTT America, Inc.TransitIPv4 IPv62,689
AS21859Zenlayer IncHostingIPv41,222
AS34549meerfarbig GmbH & Co. KGHostingIPv4 IPv6814
AS7473Singapore Telecommunications LtdUnclassifiedIPv4621
AS6939Hurricane Electric LLCTransitIPv4 IPv6511
AS4766Korea TelecomMobileIPv4 IPv6486
AS24482SG.GSHostingIPv4 IPv6460

All 48 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 IPv62,993
AS38732CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv62,567
AS45544SUPERDATA-VNUnclassifiedIPv4 IPv61,789
AS38733CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv61,755
AS38247Vietnamobile Telecommunications Joint Stock CompanyUnclassifiedIPv4 IPv61,105
AS55309Minh Tu Telecom Limited CompanyUnclassifiedIPv4 IPv61,077
AS138995Antbox Networks LimitedHostingIPv4708
AS131410Vietnam Cable Television Corporation Joint Stock CompanyUnclassifiedIPv4600
AS135983Tino Group Joint Stock CompanyUnclassifiedIPv4 IPv6574
AS154552XYLENTIS COMPANY LIMITEDUnclassifiedIPv4 IPv6451

All 102 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 IPv618,587
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv610,666
AS15412Flag Telecom UK LimitedUnclassifiedIPv4 IPv68,675
AS2914NTT America, Inc.TransitIPv4 IPv67,084
AS38733CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv65,774
AS38732CMC Telecom Infrastructure CompanyUnclassifiedIPv4 IPv65,090
AS45538ODS Joint Stock CompanyUnclassifiedIPv4 IPv63,075
AS21859Zenlayer IncHostingIPv42,424
AS135983Tino Group Joint Stock CompanyUnclassifiedIPv4 IPv62,226
AS45544SUPERDATA-VNUnclassifiedIPv4 IPv61,789

All 160 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-10 10:00 UTC by route-views2,rrc00, as seen from 74 BGP vantage points across 71.97M 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.