AS42081 ecmwf-it European Centre for Medium-Range Weather Forecasts (ECMWF)

ecmwf-it European Centre for Medium-Range Weather Forecasts (ECMWF) · registered in the United Kingdom

IPv4 addresses28,4166 prefixes · <0.001% of announced IPv4

Rank in United Kingdom#145largest network in GB by IPv4 space, of 2,074 · 0.04% of GB

Rank worldwide#5,149of 79,396 networks with IPv4

IPv62 x /482 prefixes

CountryUnited Kingdom2,261 ASNs registered there

Open AS42081 in ASN lookup Look up an IP in this network (77.83.224.1) All networks in United Kingdom

IPv4 prefixes

All 6 prefixes, in address order.

77.83.224.0/23
77.83.226.0/24
136.156.32.0/22
136.156.40.0/21
136.156.128.0/19
136.156.192.0/18

IPv6 prefixes

All 2 prefixes.

2a09:9180:ecfb::/48
2a09:9180:ecfd::/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