AS43872 OPTINET Optinet U.K. Limited

OPTINET Optinet U.K. Limited · registered in the United Kingdom

IPv4 addresses10,49617 prefixes · <0.001% of announced IPv4

Rank in United Kingdom#280largest network in GB by IPv4 space, of 2,074 · 0.02% of GB

Rank worldwide#8,774of 79,396 networks with IPv4

IPv656 x /32 (3,670,016 x /48)7 prefixes

CountryUnited Kingdom2,261 ASNs registered there

Open AS43872 in ASN lookup Look up an IP in this network (5.253.252.1) All networks in United Kingdom

IPv4 prefixes

All 17 prefixes, in address order.

5.253.252.0/22
45.136.108.0/24
84.38.246.0/24
89.222.48.0/20
91.201.105.0/24
92.118.111.0/24
176.101.169.0/24
185.183.20.0/22
185.187.61.0/24
185.253.176.0/22
193.105.189.0/24
193.247.94.0/24
193.247.101.0/24
193.247.103.0/24
193.247.165.0/24
195.234.28.0/24
217.198.183.0/24

IPv6 prefixes

All 7 prefixes.

2a0b:180::/29
2a0d:1e80::/29
2a10:c740::/29
2a10:c7c0::/29
2a10:c8c0::/29
2a10:c9c0::/29
2a10:cac0::/29

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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