AS21339 ContingencyNetworks Contingency Networks Ltd

ContingencyNetworks Contingency Networks Ltd · registered in the United Kingdom

IPv4 addresses3,3286 prefixes · <0.001% of announced IPv4

Rank in United Kingdom#565largest network in GB by IPv4 space, of 2,074 · <0.01% of GB

Rank worldwide#17,657of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited Kingdom2,261 ASNs registered there

Open AS21339 in ASN lookup Look up an IP in this network (45.143.120.1) All networks in United Kingdom

IPv4 prefixes

All 6 prefixes, in address order.

45.143.120.0/22
77.93.143.0/24
158.94.215.0/24
176.124.68.0/23
185.61.164.0/22
193.187.99.0/24

Similar-sized networks in United Kingdom

ASNNameIPv4 addresses

AS212194#562 Yuusei YUUSEI LTD3,328

AS212396#563 FYFEWEB FyfeWeb Ltd3,328

AS200514#564 KnownSRV KnownSRV Ltd.3,328

AS30933#566 PROTEXIA-EU KDA WEB SERVICES LTD3,328

AS31220#567 CARRENZA-AS Six Degrees Technology Group Limited3,328

AS31474#568 MTV-UK-AS Viacom International Media Networks U.K. Limited3,328

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