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Autonomous System

AS45903 · CMC Telecom Infrastructure Company

Overview

AS45903 is announced on the Internet: RIPE RIS route collectors currently see 355 IPv4 prefixes and 137 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 86,528 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 100 upstream neighbours (transit providers or peers) and 121 downstream neighbours (customers or networks it carries). Its most visible upstreams are HGC Global Communications Limited (AS9304), Flag Telecom UK Limited (AS15412), and PCCW Global (HK) Ltd. (AS3491). AS45903 was assigned by APNIC, and its registration country is Vietnam.

Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 17, 2026 at 12:02 AM UTC. This page is refreshed at most every 12 hours.

Go further

Trace a route to this networkOpen in the BGP viewerWHOIS of 42.96.32.1

The trace goes to 42.96.32.1, the first address of 42.96.32.0/19. An address picked inside a prefix may not answer (nothing listens there, or the network filters probes): the trace then shows the path up to the last network that replies.

Announced prefixes

IPv4 prefixes (355 prefixes)

PrefixAddresses
42.96.32.0/198,192
42.96.38.0/24256
42.96.39.0/24256
42.96.40.0/221,024
42.96.44.0/221,024
42.96.48.0/24256
42.96.49.0/24256
42.96.50.0/24256
42.96.51.0/24256
42.96.52.0/24256
42.96.53.0/24256
42.96.54.0/24256
42.96.55.0/24256
42.96.56.0/24256
42.96.57.0/24256
42.96.58.0/23512
42.96.60.0/23512
45.122.232.0/221,024
45.122.232.0/24256
45.122.233.0/24256
45.122.235.0/24256
45.122.236.0/221,024
45.122.236.0/23512
45.122.238.0/23512
45.122.238.0/24256
45.122.239.0/24256
45.122.240.0/221,024
45.122.240.0/24256
45.122.241.0/24256
45.122.243.0/24256
45.122.244.0/221,024
45.122.245.0/24256
45.122.246.0/24256
45.122.247.0/24256
45.122.248.0/221,024
45.122.248.0/24256
45.122.249.0/24256
45.122.250.0/24256
45.122.251.0/24256
45.122.252.0/24256
45.122.254.0/24256
45.122.255.0/24256
101.99.0.0/212,048
101.99.0.0/23512
101.99.1.0/24256
101.99.2.0/23512
101.99.2.0/24256
101.99.4.0/24256
101.99.5.0/24256
101.99.6.0/23512
101.99.6.0/24256
101.99.7.0/24256
101.99.8.0/212,048
101.99.8.0/24256
101.99.10.0/24256
101.99.11.0/24256
101.99.12.0/221,024
101.99.12.0/23512
101.99.12.0/24256
101.99.13.0/24256
101.99.14.0/24256
101.99.15.0/24256
101.99.16.0/212,048
101.99.16.0/221,024
101.99.16.0/23512
101.99.17.0/24256
101.99.18.0/23512
101.99.20.0/23512
101.99.20.0/24256
101.99.21.0/24256
101.99.22.0/24256
101.99.23.0/24256
101.99.24.0/212,048
101.99.24.0/23512
101.99.24.0/24256
101.99.25.0/24256
101.99.26.0/23512
101.99.26.0/24256
101.99.27.0/24256
101.99.28.0/23512
101.99.28.0/24256
101.99.29.0/24256
101.99.30.0/23512
101.99.31.0/24256
101.99.32.0/212,048
101.99.32.0/23512
101.99.34.0/24256
101.99.35.0/24256
101.99.36.0/24256
101.99.37.0/24256
101.99.38.0/24256
101.99.39.0/24256
101.99.40.0/23512
101.99.40.0/24256
101.99.41.0/24256
101.99.42.0/23512
101.99.44.0/23512
101.99.44.0/24256
101.99.45.0/24256
101.99.46.0/23512

Showing the first 100 of 355, in address order. Complete list on RIPEstat

IPv6 prefixes (137 prefixes)

Prefix
2001:df7:6640::/48
2402:5300::/35
2402:5300::/48
2402:5300:400::/42
2402:5300:405::/48
2402:5300:406::/48
2402:5300:408::/48
2402:5300:40c::/48
2402:5300:40d::/48
2402:5300:40e::/48
2402:5300:40f::/48
2402:5300:410::/48
2402:5300:411::/48
2402:5300:412::/48
2402:5300:413::/48
2402:5300:414::/48
2402:5300:415::/48
2402:5300:416::/48
2402:5300:417::/48
2402:5300:418::/48
2402:5300:419::/48
2402:5300:41a::/48
2402:5300:41b::/48
2402:5300:500::/44
2402:5300:501::/48
2402:5300:508::/48
2402:5300:509::/48
2402:5300:50a::/48
2402:5300:50b::/48
2402:5300:600::/44
2402:5300:600::/48
2402:5300:608::/48
2402:5300:609::/48
2402:5300:60a::/48
2402:5300:60b::/48
2402:5300:700::/44
2402:5300:708::/48
2402:5300:709::/48
2402:5300:70a::/48
2402:5300:70b::/48
2402:5300:800::/44
2402:5300:808::/48
2402:5300:809::/48
2402:5300:80a::/48
2402:5300:80b::/48
2402:5300:900::/44
2402:5300:904::/48
2402:5300:905::/48
2402:5300:906::/48
2402:5300:907::/48
2402:5300:1000::/40
2402:5300:1100::/40
2402:5300:1200::/44
2402:5300:1208::/48
2402:5300:1209::/48
2402:5300:120a::/48
2402:5300:120b::/48
2402:5300:1300::/40
2402:5300:1400::/40
2402:5300:1500::/40
2402:5300:1600::/40
2402:5300:2000::/35
2402:5300:2000::/42
2402:5300:200c::/48
2402:5300:200d::/48
2402:5300:2010::/48
2402:5300:2011::/48
2402:5300:2012::/48
2402:5300:2013::/48
2402:5300:2014::/48
2402:5300:2015::/48
2402:5300:2016::/48
2402:5300:2017::/48
2402:5300:2018::/48
2402:5300:2019::/48
2402:5300:201a::/48
2402:5300:201b::/48
2402:5300:201c::/48
2402:5300:201d::/48
2402:5300:201e::/48
2402:5300:201f::/48
2402:5300:2100::/44
2402:5300:2108::/48
2402:5300:2109::/48
2402:5300:210a::/48
2402:5300:2200::/44
2402:5300:2300::/44
2402:5300:2400::/44
2402:5300:2404::/48
2402:5300:2405::/48
2402:5300:2406::/48
2402:5300:2407::/48
2402:5300:4000::/35
2402:5300:4000::/42
2402:5300:4003::/48
2402:5300:400c::/48
2402:5300:400d::/48
2402:5300:400e::/48
2402:5300:400f::/48
2402:5300:4012::/48

Showing the first 100 of 137, in address order. Complete list on RIPEstat

Neighbours

Upstreams (transit or peers) (100)

ASNetworkVisibility
AS9304HGC Global Communications Limited20,545
AS15412Flag Telecom UK Limited15,215
AS3491PCCW Global (HK) Ltd.10,458
AS2914NTT America, Inc.6,622
AS5511Opentransit Orange S.A.1,934
AS21859Zenlayer Inc1,912
AS6939Hurricane Electric LLC761
AS3356Level 3 Parent, LLC714
AS7473Singapore Telecommunications Ltd684
AS58453China Mobile International Limited369
AS703Verizon Business297
AS45474-232
AS8220COLT Technology Services Group Limited230
AS4766Korea Telecom211
AS23962-187
AS4635Hong Kong Internet Exchange--Route Server 1171
AS24482SG.GS170
AS35280F5 Networks SARL166
AS34549meerfarbig GmbH & Co. KG146
AS5405Inter.link GmbH142
AS34019Hivane Association120
AS20485Joint Stock Company TransTeleCom119
AS34927iFog GmbH106
AS3935131173 Services AB95
AS25091IP-Max SA92
AS34177Celeste SAS91
AS14840BR.Digital Telecom90
AS8758Iway AG89
AS12779-86
AS3303Swisscom (Schweiz) AG84

The 30 most visible of 100.

Downstreams (customers) (121)

ASNetworkVisibility
AS38733CMC Telecom Infrastructure Company9,552
AS38732CMC Telecom Infrastructure Company8,045
AS55309Minh Tu Telecom Limited Company2,137
AS45538ODS Joint Stock Company1,953
AS135983Tino Group Joint Stock Company1,633
AS63731TIEN PHAT TECHNOLOGY CORPORATION1,437
AS24173Netnam Company1,343
AS131127GLOBAL TECHNOLOGY - TELECOMMUNICATIONS CORPORATION1,206
AS38247Vietnamobile Telecommunications Joint Stock Company1,084
AS131421Intercom Telecom., JSC1,004
AS150837-901
AS56147-886
AS63741-868
AS135947-858
AS55318-832
AS38244-810
AS396986Bytedance Inc.798
AS55306-736
AS154552-725
AS135938-722
AS55313-645
AS56150-572
AS38253-570
AS142055-531
AS131436-511
AS140765-507
AS140810-493
AS153013-486
AS139341ACE467
AS152940-461

The 30 most visible of 121.

112 more neighbours appear on both sides of this network depending on the path, so they are counted in neither list.

Visibility is RIPEstat's count of how often the route collectors observed the link. It compares neighbours with each other; it is not a traffic volume.

How to read this page

An Autonomous System (AS) is a network run under one routing policy: an internet provider, a cloud, a content network, a university. Each one has a number, its ASN, assigned by a regional registry (ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC), and uses BGP, the protocol networks use to tell each other where addresses are, to announce the blocks of addresses it delivers to.

A prefix such as 203.0.113.0/24 is a block of addresses: the number after the slash says how many bits are fixed, so a /24 holds 256 IPv4 addresses and a /16 holds 65,536. Networks often announce a large block and smaller pieces of it at the same time, which is why the address total counts each address once.

Neighbours come from the paths themselves. A network that appears just before this one in a path, on the collector's side, is an upstream: a transit provider or a peer. One that appears just after it is a downstream, usually a customer. Peering at an internet exchange also shows up as an upstream, so the upstream list is not a list of paid transit.

The data comes from RIPEstat, run by the RIPE NCC, which gathers the routing tables of hundreds of networks through its RIS route collectors. This page reads it when it is visited and keeps it for 12 hours at most; the BGP viewer reads it live.

Frequently asked questions

How do I find the ASN of an IP address?
Type the address in the BGP viewer: it shows the prefix that covers it, the AS that originates that prefix and the paths seen towards it. A traceroute also names the network of each hop, so you can see every AS a connection crosses.
Why does one company have several ASNs?
Large operators split their network by region, by activity or by history: a cloud may use one number for its backbone and another for a region, and every acquisition brings its own numbers. Each number has its own page, with its own prefixes and neighbours.
Why do prefix counts differ from one site to another?
Each source sees the routing table from different collectors, at a different time, and counts differently: some include prefixes withdrawn in recent weeks, some merge a block and its pieces. This page counts the prefixes RIPE RIS collectors see originated by the network at the end of the latest two-week window, and counts each IPv4 address once.
Is this the list of IP ranges of a cloud provider?
It is what its networks announce, which is what the Internet routes to them. Many providers also publish an official list of ranges per service and region; that list is the reference for firewall rules, because a range can be announced before it is used, or announced by another of their AS numbers.