AS205090 FIRST-SERVER-EUROPE FIRST SERVER LIMITED

FIRST-SERVER-EUROPE FIRST SERVER LIMITED · registered in the United Kingdom

IPv4 addresses17,40844 prefixes · <0.001% of announced IPv4

Rank in United Kingdom#198largest network in GB by IPv4 space, of 2,074 · 0.03% of GB

Rank worldwide#6,622of 79,396 networks with IPv4

IPv61 x /32 (65,539 x /48)4 prefixes

CountryUnited Kingdom2,261 ASNs registered there

Open AS205090 in ASN lookup Look up an IP in this network (45.9.73.1) All networks in United Kingdom

IPv4 prefixes

All 44 prefixes, in address order.

45.9.73.0/24
45.9.75.0/24
45.89.65.0/24
45.90.216.0/22
45.95.202.0/23
45.132.255.0/24
45.142.122.0/24
82.115.222.0/24
84.252.73.0/24
84.252.74.0/23
85.209.2.0/24
89.44.86.0/23
91.200.12.0/23
95.81.121.0/24
95.81.122.0/24
103.71.20.0/23
104.128.130.0/24
104.128.133.0/24
104.128.134.0/23
109.69.62.0/23
132.243.16.0/22
135.136.178.0/23
135.136.190.0/24
157.228.138.0/23
157.228.182.0/23
157.228.187.0/24
157.228.191.0/24
185.40.4.0/24
185.102.139.0/24
185.103.109.0/24
185.104.251.0/24
185.105.88.0/22
185.112.101.0/24
185.112.102.0/23
185.128.104.0/22
185.217.198.0/23
185.221.160.0/24
185.221.162.0/24
185.232.169.0/24
185.233.83.0/24
185.233.200.0/24
193.162.143.0/24
193.168.227.0/24
194.53.53.0/24

IPv6 prefixes

All 4 prefixes.

2a09:5302::/32
2a0c:5d00:2004::/48
2a0c:5d00:3013::/48
2a0c:5d04:ffff::/48

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AS61124#199 Marstons Marston's Telecoms Limited17,408

AS15601#200 Baring Investment Services Ltd17,408

AS8613#201 Wavenet-AS8613 Wavenet Limited17,152

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