Autonomous System

AS18403 FPT Telecom Company

ISPActiveVietnamAPNIC

AS18403 (FPT-VN) is an ISP network operated by FPT Telecom Company in Vietnam, registered with APNIC. It has 4,716 IPv4 prefixes with 6,206,720 addresses and 19 IPv6 prefixes, which makes it the 113th largest of 82,283 active autonomous systems by IPv4 space.

IPv4 addresses6,206,720in 4,716 prefixes
IPv6 prefixes19≈ 6.6 × 10²⁹ addresses
Size rank#113of 82,283 active ASNs
Abuser scoreLow0.16% of its addresses flagged · method

Details

OrganizationFPT Telecom Company
AS nameFPT-VN
Websitefpt.vn
Country Vietnam (VN)
Network typeISP
RegistryAPNIC
Abuse contacthm-changed@vnnic.vn
Registered—
Last updated2026-05-25

IPv4 prefixes

4,716 prefixes · 6,206,720 addresses
NetworkAddressesFirst – last address
42.112.0.0/13524,28842.112.0.0 – 42.119.255.255
1.52.0.0/14262,1441.52.0.0 – 1.55.255.255
118.68.0.0/14262,144118.68.0.0 – 118.71.255.255
58.186.0.0/15131,07258.186.0.0 – 58.187.255.255
118.68.0.0/15131,072118.68.0.0 – 118.69.255.255
42.112.0.0/1665,53642.112.0.0 – 42.112.255.255
42.113.0.0/1665,53642.113.0.0 – 42.113.255.255
42.114.0.0/1665,53642.114.0.0 – 42.114.255.255
42.115.0.0/1665,53642.115.0.0 – 42.115.255.255
42.116.0.0/1665,53642.116.0.0 – 42.116.255.255
42.117.0.0/1665,53642.117.0.0 – 42.117.255.255
42.118.0.0/1665,53642.118.0.0 – 42.118.255.255
42.119.0.0/1665,53642.119.0.0 – 42.119.255.255
58.186.0.0/1665,53658.186.0.0 – 58.186.255.255
113.22.0.0/1665,536113.22.0.0 – 113.22.255.255
183.80.0.0/1665,536183.80.0.0 – 183.80.255.255
113.23.0.0/1732,768113.23.0.0 – 113.23.127.255
183.81.0.0/1732,768183.81.0.0 – 183.81.127.255
210.245.0.0/1732,768210.245.0.0 – 210.245.127.255
1.52.0.0/1816,3841.52.0.0 – 1.52.63.255
1.52.64.0/1816,3841.52.64.0 – 1.52.127.255
1.52.128.0/1816,3841.52.128.0 – 1.52.191.255
1.52.192.0/1816,3841.52.192.0 – 1.52.255.255
1.53.0.0/1816,3841.53.0.0 – 1.53.63.255
1.53.64.0/1816,3841.53.64.0 – 1.53.127.255
The 25 largest of 4,716. The API and the database have all of them.

IPv6 prefixes

19 prefixes
  • 2405:4800::/30
  • 2405:4800::/32
  • 2405:4801::/32
  • 2405:4802::/32
  • 2405:4803::/32
  • 2405:4803:a000::/36
  • 2405:4803:b000::/36
  • 2405:4803:c000::/36
  • 2405:4803:d000::/36
  • 2405:4803:e000::/36
  • 2405:4803:f000::/36
  • 2405:4800:10c::/48
  • 2405:4800:10d::/48
  • 2405:4800:206::/48
  • 2405:4800:2fe::/48
  • 2405:4800:18c2::/48
  • 2405:4800:5cc2::/48
  • 2405:4800:a403::/48
  • 2405:4800:a601::/48

Query AS18403 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS18403&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS18403, with or without a key:

curl "https://api.ipapi.is/?q=42.112.0.1"

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