AS50300 CUSTDC CustodianDC Limited

CUSTDC CustodianDC Limited · registered in the United Kingdom

IPv4 addresses10,75217 prefixes · <0.001% of announced IPv4

Rank in United Kingdom#278largest network in GB by IPv4 space, of 2,074 · 0.02% of GB

Rank worldwide#8,730of 79,396 networks with IPv4

IPv6337 x /486 prefixes

CountryUnited Kingdom2,261 ASNs registered there

Open AS50300 in ASN lookup Look up an IP in this network (5.102.168.1) All networks in United Kingdom

IPv4 prefixes

All 17 prefixes, in address order.

5.102.168.0/21
92.118.16.0/24
109.74.240.0/22
109.74.244.0/24
109.74.246.0/23
109.74.248.0/22
109.74.252.0/24
109.74.255.0/24
176.12.104.0/22
176.12.108.0/23
176.12.110.0/24
185.14.164.0/22
185.32.72.0/23
185.32.75.0/24
185.42.65.0/24
185.48.164.0/22
193.33.198.0/24

IPv6 prefixes

All 6 prefixes.

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

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AS43872#280 OPTINET Optinet U.K. Limited10,496

AS31742#281 SOTACONNECT Sota Solutions Ltd.10,496

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources