Autonomous System
AS38733 · CMC Telecom Infrastructure Company
Overview
AS38733 is announced on the Internet: RIPE RIS route collectors currently see 28 IPv4 prefixes and 10 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 7,424 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 1 upstream neighbour (transit providers or peers) and 16 downstream neighbours (customers or networks it carries). Its most visible upstream is CMC Telecom Infrastructure Company (AS45903). AS38733 was assigned by APNIC, and its registration country is Vietnam.
Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 17, 2026 at 12:55 AM UTC. This page is refreshed at most every 12 hours.
Go further
The trace goes to 124.158.8.1, the first address of 124.158.8.0/21. 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 (28 prefixes)
| Prefix | Addresses |
|---|---|
| 42.96.33.0/24 | 256 |
| 42.96.36.0/24 | 256 |
| 42.96.37.0/24 | 256 |
| 45.122.244.0/24 | 256 |
| 103.82.32.0/22 | 1,024 |
| 103.82.32.0/23 | 512 |
| 103.82.34.0/24 | 256 |
| 103.82.35.0/24 | 256 |
| 103.236.251.0/24 | 256 |
| 115.165.161.0/24 | 256 |
| 115.165.162.0/24 | 256 |
| 115.165.163.0/24 | 256 |
| 115.165.164.0/24 | 256 |
| 115.165.165.0/24 | 256 |
| 115.165.167.0/24 | 256 |
| 119.82.133.0/24 | 256 |
| 124.158.8.0/21 | 2,048 |
| 124.158.8.0/24 | 256 |
| 124.158.9.0/24 | 256 |
| 124.158.10.0/24 | 256 |
| 124.158.11.0/24 | 256 |
| 124.158.12.0/24 | 256 |
| 124.158.13.0/24 | 256 |
| 124.158.15.0/24 | 256 |
| 203.167.12.0/22 | 1,024 |
| 203.167.12.0/23 | 512 |
| 203.167.14.0/23 | 512 |
| 203.205.15.0/24 | 256 |
IPv6 prefixes (10 prefixes)
| Prefix |
|---|
| 2001:df6:4a40::/48 |
| 2400:a8e0::/48 |
| 2401:8ce0::/48 |
| 2401:9320::/48 |
| 2401:9a60::/48 |
| 2402:43a0::/32 |
| 2402:5300:4009::/48 |
| 2402:5300:4020::/48 |
| 2402:5300:4021::/48 |
| 2402:5300:4e00::/40 |
Neighbours
Upstreams (transit or peers) (1)
| AS | Network | Visibility |
|---|---|---|
| AS45903 | CMC Telecom Infrastructure Company | 9,555 |
Downstreams (customers) (16)
| AS | Network | Visibility |
|---|---|---|
| AS401541 | - | 3,023 |
| AS150826 | VR VIET NAM COMPANY LIMITED | 804 |
| AS149085 | E-DATA TECHNOLOGY SERVICE COMPANY LIMITED | 510 |
| AS153017 | TIDADIGI COMPANY LIMITED | 495 |
| AS150884 | ANZIX Joint Stock Company | 493 |
| AS150846 | Room 1508, 15th Floor, Vincom Center Building, 72 Le Thanh Ton, Ben Nghe Ward, District 1, Ho Chi Minh City, Vietnam | 489 |
| AS135901 | Phuong Dong technology solution company limited | 366 |
| AS131353 | NhanHoa Software company | 269 |
| AS154003 | NOBIDEV COMPANY LIMITED | 269 |
| AS154350 | ATZ CORP JOINT STOCK COMPANY | 268 |
| AS132206 | - | 266 |
| AS149130 | - | 265 |
| AS149137 | - | 265 |
| AS151868 | - | 265 |
| AS131423 | - | 31 |
| AS131386 | - | 2 |
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.