AS51561 ICUK Computing Services Ltd
AS51561 is operated by ICUK Computing Services Ltd and registered with RIPE NCC (GB) since 2010-09-28.
It announces 72 IPv4 and 2 IPv6 prefixes, 10% of them RPKI valid.
RIPE RIS sees 47 upstream and peer networks and 3 downstream networks next to it.
PeeringDB lists it as an NSP network at 3 internet exchanges and 3 facilities. Its peering policy is open.
| Name | ICUK Computing Services Ltd |
|---|---|
| Registry (RIR) | RIPE NCC |
| Country | United Kingdom (GB) |
| Delegated on | 2010-09-28 |
| Network type | NSP, Europe |
| Peering policy | Open |
| IRR as-set | AS-ICUK |
| Prefixes (IPv4 / IPv6) | 72 / 2 |
| RPKI valid | 10% (8 / 74) |
| Upstreams and peers | 47 |
| Downstream networks | 3 |
| Website | icuk.net |
Routing health
- AS51561 announces 72 IPv4 and 2 IPv6 prefixes.
- 8 of 74 announced prefixes are RPKI valid.
- 66 announced prefixes are not covered by a ROA of AS51561 (they may have none, or another network’s).
- 47 upstreams and peers, 3 downstream networks seen.
For every check with the fix (IRR route objects, the RPKI state of each route, reverse DNS and the registration), run the full network report.
Announced prefixes 74
- 2.56.84.0/22
- 5.133.168.0/23
- 5.133.170.0/23
- 5.254.162.0/23
- 5.254.164.0/23
- 37.235.43.0/24
- 45.93.112.0/22
- 45.93.112.0/23
- 45.145.86.0/23
- 46.33.128.0/19
- 46.33.128.0/24
- 46.33.130.0/24
- 46.33.156.0/24
- 46.102.192.0/19
- 46.102.192.0/24
- 46.102.193.0/24
- 46.226.120.0/24
- 80.95.192.0/20
- 80.209.128.0/19
- 80.209.128.0/24
- 80.209.155.0/24
- 80.209.159.0/24
- 80.209.160.0/20
- 80.209.176.0/21
- 80.209.184.0/22
- 80.209.188.0/23
- 80.209.190.0/23
- 80.247.216.0/24
- 82.39.142.0/24
- 89.107.24.0/22
- 91.233.33.0/24
- 138.124.128.0/20
- 138.124.128.0/24
- 138.124.134.0/24
- 138.124.135.0/24
- 138.124.136.0/24
- 138.124.137.0/24
- 138.124.138.0/24
- 138.124.142.0/24
- 185.2.236.0/22
- 185.32.55.0/24
- 185.35.148.0/22
- 185.35.148.0/24
- 185.35.149.0/24
- 185.35.150.0/24
- 185.35.151.0/24
- 185.132.52.0/24
- 185.137.240.0/24
- 185.140.16.0/23
- 185.140.18.0/23
- 185.145.152.0/22
- 185.145.152.0/24
- 185.152.2.0/24
- 185.168.10.0/24
- 185.201.208.0/22
- 185.234.255.0/24
- 185.243.62.0/24
- 185.243.63.0/24
- 185.253.88.0/24
- 188.211.249.0/24
- 188.240.160.0/19
- 188.240.160.0/24
- 188.240.172.0/24
- 188.240.173.0/24
- 188.240.191.0/24
- 193.161.9.0/24
- 193.161.10.0/24
- 193.187.0.0/24
- 194.15.37.0/24
- 205.157.160.0/19
- 205.157.160.0/24
- 217.22.12.0/24
- 2a00:b900:2::/48
- 2a00:b900::/32
Upstreams and peers 47
The networks RIPE RIS sees next to AS51561 in BGP paths, the most visible first.
Peering
Peering policy: Open. Suggested max-prefix limits: 250 IPv4, 25 IPv6. PeeringDB record
| Exchange | Ports | Speed | Route server |
|---|---|---|---|
| LINX LON1: Main | 1 | 40G | Yes |
| LINX LON2 | 1 | 20G | Yes |
| LONAP: LON0 | 1 | 40G | Yes |
| Facility | City | Country |
|---|---|---|
| Equinix LD8 - London, Docklands | London | GB |
| Telehouse - London (Docklands North) | London | GB |
| Telehouse - London (Docklands West) | London | GB |
More about AS51561
Sources: RIR delegation data and PeeringDB (updated daily); routing from RIPEstat (RIPE NCC RIS and RPKI), refreshed daily. Routing data from 2026-11-14 01:04 UTC. The country is where the AS number was registered, not necessarily where the network operates.