AS42427 MIMECAST-UK Mimecast Services Limited

MIMECAST-UK Mimecast Services Limited · registered in the United Kingdom

IPv4 addresses2,8167 prefixes · <0.001% of announced IPv4

Rank in United Kingdom#617largest network in GB by IPv4 space, of 2,074 · <0.01% of GB

Rank worldwide#19,293of 79,396 networks with IPv4

IPv62 x /481 prefixes

CountryUnited Kingdom2,261 ASNs registered there

Open AS42427 in ASN lookup Look up an IP in this network (91.220.42.1) All networks in United Kingdom

IPv4 prefixes

All 7 prefixes, in address order.

91.220.42.0/24
185.58.84.0/22
193.7.204.0/23
195.130.217.0/24
207.82.80.0/24
216.35.243.0/24
216.35.244.0/24

IPv6 prefixes

All 1 prefix.

2a02:5be0::/47

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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