$ 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 73 216 IPv4 addresses, and supports IPv6. Its primary geographic footprint is in the United Kingdom, with additional presence in Germany. This AS has recently updated its prefix announcements.

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 23, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
72 / 38
IPv6 Prefixes (raw / aggregated)
2 / 1
IPv4 Addresses
73 216
Largest IPv4 Prefix
/18 (16 384 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇬🇧 United Kingdom (72 960 IPs), 🇩🇪 Germany (256 IPs)
Prefix Changed
October 21, 2026

Reputation

Reputation
Good — 3 flagged IPs out of 73 216 total (0.00%)

Connectivity Summary

Upstream Providers
4 upstreams providing transit
Peers
608 networks exchanging traffic without transit
Downstream Customers
2 downstreams buying transit
Unclassified
2 unclassified BGP neighbors
Degree
616 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 (72 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))
  • 194.15.37.0/24 (256 addresses (/24 prefix))
  • 217.22.12.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (2 total)

  • 2a00:b900::/32