Get started Dashboard
Home / ASN Lookup / AS18403

AS18403
FPT-AS-AP FPT Telecom Company

AS18403 announces 1,422,072 IPv4 addresses across 261 routed ranges, registered in VN. Figures come from the public global routing table and are refreshed daily.

1.4M addressesIPv4 space announced
261Routed ranges
VNRegistry country

Is AS18403 datacenter space?

Not according to the nine cloud and CDN providers whose published range lists we track. That is a statement about those specific lists, not proof the space is residential — plenty of hosting companies never publish machine-readable ranges, and this AS may well be one of them.

The reliable way to classify a specific address is to check it directly rather than to infer from the AS. The free lookup tool checks any address against the Tor exit list and the published cloud-provider ranges. VPN and proxy verdicts need a live visit: they come from a /v1/evaluate call with the browser token, not from a bare address.

What an AS number does and does not tell you

An autonomous system number identifies who announces a block of addresses to the internet's routing table. It is an organisational fact, and a durable one — useful for attributing traffic to a hosting company, a carrier, or a university.

It is not a risk signal. A residential ISP's AS carries the household traffic of millions of ordinary customers and, at the same time, whatever residential proxy exits have been installed on those customers' devices. A hosting AS carries scrapers and legitimate server-to-server integrations in the same ranges. Scoring an address on the reputation of its AS produces exactly the false positives that make fraud tooling untrustworthy.

Maskbreak does not feed AS names or routing data into its risk score. Tunnel detection comes from live network intelligence, and the dch signal comes from provider-published ranges. This directory exists to answer "who announces this address," which is a different and genuinely useful question.

Announced IPv4 ranges

First 100 of 261 ranges.

Range startRange endAddresses
1.52.0.01.52.69.25517,920
1.52.70.01.52.215.25537,376
1.52.216.01.52.238.2555,888
1.52.239.01.53.24.25510,752
1.53.25.01.53.122.25525,088
1.53.123.01.53.140.2554,608
1.53.141.01.54.0.25529,696
1.54.1.01.54.49.25512,544
1.54.50.01.54.252.25551,968
1.54.253.01.55.55.25515,104
1.55.56.01.55.69.2553,584
1.55.70.01.55.155.25522,016
1.55.156.01.55.252.25524,832
1.55.253.01.55.255.255768
23.32.74.023.32.74.255256
23.173.8.023.173.9.255512
23.193.188.023.193.191.2551,024
23.196.68.023.196.71.2551,024
23.202.89.023.202.89.255256
23.208.160.023.208.163.2551,024
42.112.0.042.112.1.255512
42.112.2.042.112.16.2553,840
42.112.17.042.112.20.2551,024
42.112.21.042.112.28.2552,048
42.112.29.042.112.36.2552,048
42.112.37.042.112.42.2551,536
42.112.43.042.112.60.2554,608
42.112.61.042.112.103.25511,008
42.112.104.042.112.148.25511,520
42.112.149.042.112.237.25522,784
42.112.238.042.113.16.2558,960
42.113.17.042.113.18.255512
42.113.19.042.113.25.2551,792
42.113.26.042.113.64.2559,984
42.113.65.042.113.96.2558,192
42.113.97.042.113.137.25510,496
42.113.138.042.113.165.2557,168
42.113.166.042.113.189.2556,144
42.113.190.042.113.240.25513,056
42.113.241.042.113.243.255768
42.113.244.042.114.7.2555,120
42.114.8.042.114.73.25516,896
42.114.74.042.114.114.25510,496
42.114.115.042.114.135.2555,376
42.114.136.042.114.142.2551,792
42.114.143.042.114.222.25520,480
42.114.223.042.114.243.2555,376
42.114.244.042.114.246.255768
42.114.247.042.114.250.2551,024
42.114.251.042.115.21.2556,912
42.115.22.042.115.23.255512
42.115.24.042.115.28.2551,280
42.115.29.042.115.39.2552,816
42.115.40.042.115.44.2551,280
42.115.45.042.115.50.2551,536
42.115.51.042.115.54.2551,024
42.115.55.042.115.76.2555,632
42.115.77.042.115.84.2552,048
42.115.85.042.115.128.25511,264
42.115.129.042.115.144.2554,096
42.115.145.042.115.155.2552,816
42.115.156.042.115.165.2552,560
42.115.166.042.115.253.25522,528
42.115.254.042.116.49.25513,312
42.116.50.042.116.149.25525,600
42.116.150.042.116.199.25512,800
42.116.200.042.116.214.2553,840
42.116.215.042.116.221.2551,792
42.116.222.042.117.0.2558,960
42.117.1.042.117.3.255768
42.117.4.042.117.8.2551,280
42.117.9.042.117.10.255512
42.117.11.042.117.22.2553,072
42.117.23.042.117.70.25512,288
42.117.71.042.117.82.2553,072
42.117.83.042.117.96.2553,584
42.117.97.042.117.165.25517,664
42.117.166.042.117.181.2554,096
42.117.182.042.117.183.255512
42.117.184.042.117.192.2552,304
42.117.193.042.117.196.2551,024
42.117.197.042.117.252.25514,336
42.117.253.042.118.37.25510,496
42.118.38.042.118.46.2552,304
42.118.47.042.118.123.25519,712
42.118.124.042.118.162.2559,984
42.118.163.042.118.192.2557,680
42.118.193.042.118.210.2554,608
42.118.211.042.118.237.2556,912
42.118.238.042.118.245.2552,048
42.118.246.042.119.17.2557,168
42.119.18.042.119.61.25511,264
42.119.62.042.119.96.2558,960
42.119.97.042.119.104.2552,048
42.119.105.042.119.112.2552,048
42.119.113.042.119.205.25523,808
42.119.206.042.119.224.2554,864
42.119.225.042.119.246.2555,632
42.119.247.042.119.254.2552,048
42.119.255.042.119.255.255256

Check a specific address

The AS tells you who announces a range. An address check answers whether one address inside it is a Tor exit or sits in a published cloud range — for example 1.52.0.0, the first address in this AS's announced space; whether a visitor is on a VPN or proxy needs a live visit. The free lookup tool takes any address, and the IP intelligence hub explains what each signal means.

Look up another network

Check a specific address in this AS.
VPN and proxy verdicts on live visits; Tor and cloud-range checks on any address. Free plan: 10,000 visitor checks a month.
Get a free API key →
What is an ASN? All ASNs Example: 1.52.0.0 IP intelligence Free IP lookup Hosting provider ranges Residential proxy detection guide TLS fingerprinting