AS204339 FIRSTSERVER-FL-AS FIRST SERVER LIMITED

FIRSTSERVER-FL-AS FIRST SERVER LIMITED · registered in the United Kingdom

IPv4 addresses13,56838 prefixes · <0.001% of announced IPv4

Rank in United Kingdom#241largest network in GB by IPv4 space, of 2,074 · 0.02% of GB

Rank worldwide#7,727of 79,396 networks with IPv4

IPv62 x /482 prefixes

CountryUnited Kingdom2,261 ASNs registered there

Open AS204339 in ASN lookup Look up an IP in this network (45.9.72.1) All networks in United Kingdom

IPv4 prefixes

All 38 prefixes, in address order.

45.9.72.0/24
45.138.73.0/24
45.138.74.0/24
46.8.96.0/24
46.8.178.0/23
46.8.218.0/24
46.17.105.0/24
83.147.194.0/24
91.186.208.0/22
91.186.220.0/22
91.217.76.0/24
95.81.93.0/24
95.81.119.0/24
95.81.120.0/24
95.214.9.0/24
104.128.131.0/24
132.243.20.0/22
135.136.181.0/24
135.136.189.0/24
157.228.128.0/23
157.228.152.0/23
157.228.178.0/23
157.228.188.0/23
178.253.31.0/24
185.17.1.0/24
185.40.7.0/24
185.58.204.0/24
185.102.136.0/24
185.106.93.0/24
185.106.94.0/24
185.114.74.0/24
185.117.116.0/24
185.200.190.0/24
185.217.197.0/24
185.233.82.0/24
185.252.144.0/24
193.124.182.0/23
193.124.190.0/24

IPv6 prefixes

All 2 prefixes.

2a04:5200:68::/48
2a04:5201:2::/48

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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