AS51561 AS-ICUK ICUK Computing Services Limited
🇬🇧Org handle: ORG-ICSL4-RIPE
RIPE NCCallocated
Announced Prefixes (BGP)
74total
72 IPv42 IPv6
IPv4 Addresses
Allocated (RIR)73,560
Announced (BGP)80,128
IPv6 Addresses
Allocated (RIR)7.9×10²⁸
Announced (BGP)7.9×10²⁸
Prefix Limit (IPv4)
200
Prefix Limit (IPv6)
10
Country
🇬🇧 GBRIR
RIPE NCCStatus
allocated
Allocated
2010-09-28
Announced Prefixes
(BGP)74|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | Other IRR | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 |
1-10 of 74
1 / 8
Allocated Prefixes
(RIR)47Prefix | Country | RIR | Status |
|---|---|---|---|
| 2.56.84.0/22 | 🇬🇧 GB | RIPENCC | allocated |
| 5.254.162.0/23 | 🇬🇧 GB | RIPE | assigned |
| 5.254.164.0/23 | 🇬🇧 GB | RIPE | assigned |
| 37.235.43.0/24 | 🇬🇧 GB | RIPE | assigned |
| 45.93.112.0/22 | 🇬🇧 GB | RIPENCC | allocated |
| 46.33.128.0/19 | 🇬🇧 GB | RIPENCC | allocated |
| 46.33.128.0/24 | 🇬🇧 GB | RIPE | assigned |
| 46.33.130.0/24 | 🇬🇧 GB | RIPE | assigned |
| 46.102.192.0/19 | 🇬🇧 GB | RIPENCC | allocated |
| 46.102.192.0/24 | 🇬🇧 GB | RIPE | assigned |
1-10 of 47
1 / 5
All 74 announced prefixes of AS51561 →
BGP Neighbours
(seen in AS paths)Upstreams (6)
Networks AS51561 hands its own prefixes to: transit providers, or peers at an exchange.
ASPA
No ASPA
Abuse Contact
External Links
Learn more
- What is an ASN?Autonomous systems, ASN ranges and how they are assigned
- RPKI and route origin validationWhat the RPKI badges on the prefix list mean
- ASPA explainedWhy AS51561 should publish an ASPA object
- IPv4 transfers in the RIPE NCC regionMonthly volume and the latest registry transfers
- ASN data in AI agents and SIEMMCP server and API integrations
API
Open https://api.ipctl.io/v1/asn/51561Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/51561" | jq