AS51561
ICUK Computing Services Limited
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Trust score 65 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Present at 3 internet exchanges: LINX LON2, LINX LON1: Main, LONAP: LON0
AS51561 — global IP footprint
Cities where AS51561 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS51561 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 181.215.32.0/24 | 6,636 | 2026-07-24 15:49:03 |
| 80.247.216.0/24 | 6,300 | 2026-07-24 15:47:13 |
| 185.140.18.0/23 | 6,298 | 2026-07-24 15:47:13 |
| 2.56.84.0/22 | 6,196 | 2026-07-24 15:47:13 |
| 185.32.55.0/24 | 6,163 | 2026-07-24 15:47:13 |
| 205.157.160.0/19 | 6,099 | 2026-07-24 15:47:13 |
| 5.133.168.0/23 | 6,086 | 2026-07-24 15:47:13 |
| 5.133.170.0/23 | 6,066 | 2026-07-24 15:47:13 |
| 5.254.162.0/23 | 6,048 | 2026-07-24 15:47:13 |
| 5.254.164.0/23 | 6,046 | 2026-07-24 15:47:13 |
| 89.107.24.0/22 | 5,866 | 2026-07-24 15:47:13 |
| 80.209.160.0/20 | 5,863 | 2026-07-24 15:47:13 |
| 80.209.128.0/19 | 5,854 | 2026-07-24 15:47:13 |
| 80.209.184.0/22 | 5,854 | 2026-07-24 15:47:13 |
| 45.145.86.0/23 | 5,847 | 2026-07-24 15:47:13 |
| 46.33.128.0/19 | 5,841 | 2026-07-24 15:47:13 |
| 91.233.33.0/24 | 5,836 | 2026-07-24 15:47:13 |
| 45.93.112.0/22 | 5,833 | 2026-07-24 15:47:13 |
| 46.102.192.0/19 | 5,833 | 2026-07-24 15:47:13 |
| 80.209.176.0/21 | 5,824 | 2026-07-24 15:47:13 |
| 80.95.192.0/20 | 5,822 | 2026-07-24 15:47:13 |
| 37.235.43.0/24 | 5,797 | 2026-07-24 15:47:13 |
| 46.226.120.0/24 | 5,793 | 2026-07-24 15:50:02 |
| 188.211.249.0/24 | 5,757 | 2026-07-24 15:47:13 |
| 138.124.128.0/20 | 5,754 | 2026-07-24 15:47:13 |
| 82.39.142.0/24 | 5,737 | 2026-07-24 15:50:02 |
| 185.145.152.0/22 | 5,735 | 2026-07-24 15:47:13 |
| 185.2.236.0/22 | 5,695 | 2026-07-24 15:47:13 |
| 185.234.255.0/24 | 5,688 | 2026-07-24 15:47:13 |
| 185.132.52.0/24 | 5,688 | 2026-07-24 15:47:13 |
| 185.253.88.0/24 | 5,687 | 2026-07-24 15:47:13 |
| 185.201.208.0/22 | 5,684 | 2026-07-24 15:47:13 |
| 185.243.63.0/24 | 5,683 | 2026-07-24 15:47:13 |
| 185.243.62.0/24 | 5,682 | 2026-07-24 15:47:13 |
| 188.240.160.0/19 | 5,671 | 2026-07-24 15:47:13 |
| 193.187.0.0/24 | 5,655 | 2026-07-24 15:47:13 |
| 185.152.2.0/24 | 5,624 | 2026-07-24 15:50:02 |
| 193.161.10.0/24 | 5,605 | 2026-07-24 15:50:02 |
| 193.161.9.0/24 | 5,589 | 2026-07-24 15:50:02 |
| 46.102.192.0/24 | 5,529 | 2026-07-24 15:52:29 |
| 46.102.193.0/24 | 5,480 | 2026-07-24 15:52:29 |
| 46.33.128.0/24 | 5,316 | 2026-07-24 15:52:29 |
| 80.209.155.0/24 | 5,294 | 2026-07-24 15:46:36 |
| 205.157.160.0/24 | 5,282 | 2026-07-24 15:53:55 |
| 188.240.160.0/24 | 5,263 | 2026-07-24 15:53:41 |
| 188.240.191.0/24 | 5,262 | 2026-07-24 15:53:41 |
| 188.240.172.0/24 | 5,247 | 2026-07-24 15:53:41 |
| 185.35.148.0/22 | 5,240 | 2026-07-24 15:53:35 |
| 188.240.173.0/24 | 5,207 | 2026-07-24 15:53:41 |
| 80.209.159.0/24 | 5,186 | 2026-07-24 15:52:43 |
Showing top 50 of 70 announced prefixes by sample volume.
Frequently Asked Questions
What is AS51561?
AS51561 is an Autonomous System Number assigned to ICUK Computing Services Limited. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS51561 announce?
AS51561 announces 72.4K IPv4 addresses distributed across 41 routed CIDR prefixes. The network is registered in United Kingdom.
Who operates AS51561?
AS51561 is operated by ICUK Computing Services Limited. The organization is based in United Kingdom. You can view all IP ranges and related ASNs on the organization page.
What country is AS51561 registered in?
AS51561 is registered in United Kingdom. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
