The IP API The IP API
// ASN

AS204731

FIBRENEST, GB

Detailed information about the Autonomous System. Need another one? Look up a different ASN.

ASN
AS204731
Organization
UK-FIBRENEST1-20180117
Description
FIBRENEST, GB
Country
GB
Registry (RIR)
RIPE
Created
2025-08-23
Updated
2026-02-10
IPv4 Prefixes
6
IPv6 Prefixes
16

IPv4 Prefixes

6 total
154.62.164.0/22
154.62.168.0/22
185.241.224.0/22
185.241.226.0/23
38.126.80.0/20
38.126.88.0/21

IPv6 Prefixes

16 total · showing first 10
2a0c:b381:1100::/40
2a0c:b381:1200::/40
2a0c:b381:1300::/40
2a0c:b381:1400::/40
2a0c:b381:1500::/40
2a0c:b381:1600::/40
2a0c:b381:1700::/40
2a0c:b381:1800::/40
2a0c:b381:1900::/40
2a0c:b381:500::/40

What is AS204731?

AS204731 is an Autonomous System Number (ASN) assigned to UK-FIBRENEST1-20180117. An ASN identifies a network or group of IP prefixes operated under a common routing policy in the BGP protocol.

Looking for more ASN data?

Use our ASN Lookup Tool for real-time WHOIS queries, or explore our API documentation to integrate ASN data into your applications.