Autonomous System
AS51561 ICUK Computing Services Limited
HostingActiveUnited KingdomRIPE
AS51561 (AS-ICUK) is a hosting network operated by ICUK Computing Services Limited in United Kingdom, registered with RIPE. It has 71 IPv4 prefixes with 79,872 addresses and 2 IPv6 prefixes, which makes it the 2,706th largest of 82,200 active autonomous systems by IPv4 space.
IPv4 addresses79,872in 71 prefixes
IPv6 prefixes2≈ 7.9 × 10²⁸ addresses
Size rank#2,706of 82,200 active ASNs
Details
OrganizationICUK Computing Services Limited · hosting provider profile
AS nameAS-ICUK
Websiteicuk.net
Country United Kingdom (GB)
Network typeHosting
RegistryRIPE
Abuse contactabuse@interdns.co.uk
Registered2010-09-28
Last updated2026-02-24
IPv4 prefixes
71 prefixes · 79,872 addresses| Network | Addresses | First – last address |
|---|---|---|
| 46.33.128.0/19 | 8,192 | 46.33.128.0 – 46.33.159.255 |
| 46.102.192.0/19 | 8,192 | 46.102.192.0 – 46.102.223.255 |
| 80.209.128.0/19 | 8,192 | 80.209.128.0 – 80.209.159.255 |
| 188.240.160.0/19 | 8,192 | 188.240.160.0 – 188.240.191.255 |
| 205.157.160.0/19 | 8,192 | 205.157.160.0 – 205.157.191.255 |
| 80.95.192.0/20 | 4,096 | 80.95.192.0 – 80.95.207.255 |
| 80.209.160.0/20 | 4,096 | 80.209.160.0 – 80.209.175.255 |
| 138.124.128.0/20 | 4,096 | 138.124.128.0 – 138.124.143.255 |
| 80.209.176.0/21 | 2,048 | 80.209.176.0 – 80.209.183.255 |
| 2.56.84.0/22 | 1,024 | 2.56.84.0 – 2.56.87.255 |
| 45.93.112.0/22 | 1,024 | 45.93.112.0 – 45.93.115.255 |
| 80.209.184.0/22 | 1,024 | 80.209.184.0 – 80.209.187.255 |
| 89.107.24.0/22 | 1,024 | 89.107.24.0 – 89.107.27.255 |
| 185.2.236.0/22 | 1,024 | 185.2.236.0 – 185.2.239.255 |
| 185.35.148.0/22 | 1,024 | 185.35.148.0 – 185.35.151.255 |
| 185.145.152.0/22 | 1,024 | 185.145.152.0 – 185.145.155.255 |
| 185.201.208.0/22 | 1,024 | 185.201.208.0 – 185.201.211.255 |
| 5.133.168.0/23 | 512 | 5.133.168.0 – 5.133.169.255 |
| 5.133.170.0/23 | 512 | 5.133.170.0 – 5.133.171.255 |
| 5.254.162.0/23 | 512 | 5.254.162.0 – 5.254.163.255 |
| 5.254.164.0/23 | 512 | 5.254.164.0 – 5.254.165.255 |
| 45.93.112.0/23 | 512 | 45.93.112.0 – 45.93.113.255 |
| 45.145.86.0/23 | 512 | 45.145.86.0 – 45.145.87.255 |
| 80.209.188.0/23 | 512 | 80.209.188.0 – 80.209.189.255 |
| 80.209.190.0/23 | 512 | 80.209.190.0 – 80.209.191.255 |
46.33.128.0/19 46.102.192.0/19 80.209.128.0/19 188.240.160.0/19 205.157.160.0/19 80.95.192.0/20 80.209.160.0/20 138.124.128.0/20 80.209.176.0/21 2.56.84.0/22 45.93.112.0/22 80.209.184.0/22 89.107.24.0/22 185.2.236.0/22 185.35.148.0/22 185.145.152.0/22 185.201.208.0/22 5.133.168.0/23 5.133.170.0/23 5.254.162.0/23 5.254.164.0/23 45.93.112.0/23 45.145.86.0/23 80.209.188.0/23 80.209.190.0/23
The 25 largest of 71. The API and the database have all of them.
IPv6 prefixes
2 prefixes- 2a00:b900::/32
- 2a00:b900:2::/48
2a00:b900::/32 2a00:b900:2::/48
Query AS51561 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=AS51561&key=YOUR_API_KEY"Any address in its prefixes resolves to AS51561, with or without a key:
curl "https://api.ipapi.is/?q=46.33.128.1"