AS30031 Mimecast North America Inc

MIMECAST-US - Mimecast North America Inc · registered in the United States

IPv4 addresses5,63213 prefixes · <0.001% of announced IPv4

Rank in United States#3,913largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#12,832of 79,396 networks with IPv4

IPv65 x /483 prefixes

CountryUnited States18,679 ASNs registered there

Open AS30031 in ASN lookup Look up an IP in this network (41.74.203.1) All networks in United States

IPv4 prefixes

All 13 prefixes, in address order.

41.74.203.0/24
63.128.21.0/24
170.10.128.0/22
170.10.132.0/23
170.10.140.0/24
170.10.150.0/23
170.10.152.0/23
170.10.156.0/23
205.139.110.0/23
207.211.30.0/24
216.145.218.0/23
216.145.222.0/24
216.205.24.0/24

IPv6 prefixes

All 3 prefixes.

2620:134:6000::/47
2620:134:6002::/48
2620:134:6008::/47

Other ASNs named Mimecast North America Inc

1 other network uses the same organisation name; together with AS30031 they announce 6,656 IPv4 addresses.

ASNNameIPv4 addresses

AS33538MIMECAST-CA - Mimecast North America Inc US1,024

Similar-sized networks in United States

ASNNameIPv4 addresses

AS31769#3910 GIGSTREEM-NYC - GiGstreem5,632

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AS27385#3912 QUALYS - QUALYS, Inc.5,632

AS33522#3914 CPANEL-INC - cPanel, LLC.5,632

AS395592#3915 ERI-CANADA - Ericsson Inc.5,632

AS32922#3916 ATCCOMMICATIONS - ATC Communications5,632

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