$ query “AS51561” --type=asn → 1 result(s)

AS51561 · AS-ICUK

ICUK Computing Services Limited

AS51561 belongs to ICUK Computing Services Limited and is a residential access provider, based in the United Kingdom since 2010. The system announces a respectable 72 960 IPv4 addresses, and supports IPv6. Its primary geographic footprint is in the United Kingdom, with additional presence in Germany.

Basic Information

Country
🇬🇧 United Kingdom
Category
Internet Service Provider
Network Role
Access Provider
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
September 28, 2010
Last Changed
October 03, 2026
Last Seen
October 10, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
71 / 37
IPv6 Prefixes (raw / aggregated)
2 / 1
IPv4 Addresses
72 960
Largest IPv4 Prefix
/18 (16 384 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇬🇧 United Kingdom (72 704 IPs), 🇩🇪 Germany (256 IPs)
Prefix Changed
September 25, 2026

Reputation

Reputation
Good — 1 flagged IPs out of 72 960 total (0.00%)

Connectivity Summary

Upstream Providers
4 upstreams providing transit
Peers
88 networks exchanging traffic without transit
Downstream Customers
2 downstreams buying transit
Unclassified
3 unclassified BGP neighbors
Degree
97 unique BGP neighbors
Reach
2 networks in customer cone

Upstream Providers (4)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS174 — COGENT-174 (Tier-1 transit)
  • AS13335 — CLOUDFLARENET
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)

Prefix Lists

IPv4 Prefixes (71 total)

  • 80.209.128.0/18 (16 384 addresses (/18 prefix))
  • 46.33.128.0/19 (8 192 addresses (/19 prefix))
  • 46.102.192.0/19 (8 192 addresses (/19 prefix))
  • 188.240.160.0/19 (8 192 addresses (/19 prefix))
  • 205.157.160.0/19 (8 192 addresses (/19 prefix))
  • 80.95.192.0/20 (4 096 addresses (/20 prefix))
  • 138.124.128.0/20 (4 096 addresses (/20 prefix))
  • 2.56.84.0/22 (1 024 addresses (/22 prefix))
  • 5.133.168.0/22 (1 024 addresses (/22 prefix))
  • 45.93.112.0/22 (1 024 addresses (/22 prefix))
  • 89.107.24.0/22 (1 024 addresses (/22 prefix))
  • 185.2.236.0/22 (1 024 addresses (/22 prefix))
  • 185.35.148.0/22 (1 024 addresses (/22 prefix))
  • 185.140.16.0/22 (1 024 addresses (/22 prefix))
  • 185.145.152.0/22 (1 024 addresses (/22 prefix))
  • 185.201.208.0/22 (1 024 addresses (/22 prefix))
  • 5.254.162.0/23 (512 addresses (/23 prefix))
  • 5.254.164.0/23 (512 addresses (/23 prefix))
  • 45.145.86.0/23 (512 addresses (/23 prefix))
  • 185.243.62.0/23 (512 addresses (/23 prefix))
  • 37.235.43.0/24 (256 addresses (/24 prefix))
  • 46.226.120.0/24 (256 addresses (/24 prefix))
  • 80.247.216.0/24 (256 addresses (/24 prefix))
  • 82.39.142.0/24 (256 addresses (/24 prefix))
  • 91.233.33.0/24 (256 addresses (/24 prefix))
  • 185.32.55.0/24 (256 addresses (/24 prefix))
  • 185.132.52.0/24 (256 addresses (/24 prefix))
  • 185.137.240.0/24 (256 addresses (/24 prefix))
  • 185.152.2.0/24 (256 addresses (/24 prefix))
  • 185.168.10.0/24 (256 addresses (/24 prefix))
  • 185.234.255.0/24 (256 addresses (/24 prefix))
  • 185.253.88.0/24 (256 addresses (/24 prefix))
  • 188.211.249.0/24 (256 addresses (/24 prefix))
  • 193.161.9.0/24 (256 addresses (/24 prefix))
  • 193.161.10.0/24 (256 addresses (/24 prefix))
  • 193.187.0.0/24 (256 addresses (/24 prefix))
  • 217.22.12.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (2 total)

  • 2a00:b900::/32