AS41230 ASK4 ASK4 Limited

ASK4 ASK4 Limited · registered in the United Kingdom

IPv4 addresses88,32012 prefixes · 0.003% of announced IPv4

Rank in United Kingdom#56largest network in GB by IPv4 space, of 2,074 · 0.13% of GB

Rank worldwide#2,035of 79,396 networks with IPv4

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

CountryUnited Kingdom2,261 ASNs registered there

Open AS41230 in ASN lookup Look up an IP in this network (31.205.0.1) All networks in United Kingdom

IPv4 prefixes

All 12 prefixes, in address order.

31.205.0.0/17
31.205.128.0/17
45.81.120.0/22
45.154.248.0/22
78.109.176.0/20
81.23.48.0/20
176.119.145.0/24
185.134.128.0/22
185.134.136.0/22
185.134.144.0/22
185.198.228.0/22
213.143.0.0/19

IPv6 prefixes

All 7 prefixes.

2a00:1a10::/29
2a07:c300::/29
2a0e:2a40::/29
2a0e:2ac0::/29
2a0e:5680::/29
2a0f:dd00::/29
2a10:d00::/29

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AS29550#58 SIMPLYTRANSIT Team Blue Carrier Limited85,760

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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