$ query “AS50300” --type=asn → 1 result(s)

AS50300 · CUSTDC

CustodianDC Limited

AS50300 is run by CustodianDC Limited and is a hosting access provider, based in the United Kingdom since 2009. The system announces a respectable 10 752 IPv4 addresses, and supports IPv6. The bulk of its IP address space is in the United Kingdom, with additional presence in Greece.

  • Top 5% — Top 5% of all autonomous systems by reach and degree

Basic Information

Country
🇬🇧 United Kingdom
Category
Hosting
Network Role
Access Provider
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
December 16, 2009
Last Changed
March 04, 2026
Last Seen
June 22, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
39 / 17
IPv6 Prefixes (raw / aggregated)
7 / 6
IPv4 Addresses
10 752
Largest IPv4 Prefix
/21 (2 048 addresses)
Largest IPv6 Prefix
/40
Geolocated Countries
🇬🇧 United Kingdom (13 824 IPs), 🇬🇷 Greece (256 IPs)
Prefix Changed
June 06, 2026

Reputation

Reputation
Good — 1 flagged IPs out of 10 752 total (0.01%)

Connectivity Summary

Upstream Providers
6 upstreams providing transit
Peers
1 181 networks exchanging traffic without transit
Downstream Customers
5 downstreams buying transit
Unclassified
79 unclassified BGP neighbors
Degree
1 271 unique BGP neighbors
Reach
9 networks in customer cone

Upstream Providers (6)

  • AS174 — COGENT (Tier-1 transit)
  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS3257 — GTT-BACKBONE (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS3223 — VOXILITY
  • AS39686 — AS-EUROFIBER

Prefix Lists

IPv4 Prefixes (39 total)

  • 5.102.168.0/21 (2 048 addresses (/21 prefix))
  • 176.12.104.0/22 (1 024 addresses (/22 prefix))
  • 185.48.164.0/22 (1 024 addresses (/22 prefix))
  • 109.74.240.0/22 (1 024 addresses (/22 prefix))
  • 185.14.164.0/22 (1 024 addresses (/22 prefix))
  • 109.74.248.0/22 (1 024 addresses (/22 prefix))
  • 109.74.246.0/23 (512 addresses (/23 prefix))
  • 176.12.108.0/23 (512 addresses (/23 prefix))
  • 185.32.72.0/23 (512 addresses (/23 prefix))
  • 109.74.255.0/24 (256 addresses (/24 prefix))
  • 109.74.252.0/24 (256 addresses (/24 prefix))
  • 176.12.110.0/24 (256 addresses (/24 prefix))
  • 109.74.244.0/24 (256 addresses (/24 prefix))
  • 185.32.75.0/24 (256 addresses (/24 prefix))
  • 185.42.65.0/24 (256 addresses (/24 prefix))
  • 92.118.16.0/24 (256 addresses (/24 prefix))
  • 193.33.198.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (7 total)

  • 2a00:1c10:100::/40
  • 2a00:1c10::/43
  • 2a00:1c10:30::/44
  • 2a00:1c10:cd0::/44
  • 2a00:1c10:fff0::/44
  • 2a00:1c10:da2::/48