AS30031 — MIMECAST-

AS30031 announces 13 IPv4 prefixes covering 5,632 addresses and 2 IPv6 prefixes.

About this network

The AS handle MIMECAST- is held by Mimecast North America Inc.

What it's used for

• The address space carries email security infrastructure, evidenced by reverse DNS entries such as us-smtp-delivery-126.mimecast.com and usb-smtp-delivery-126.mimecast.com.
• The AS announces 5632 IPv4 addresses across 13 prefixes and 3 IPv6 prefixes, while maintaining only 4 observed neighbours, a ratio that indicates a dedicated business network rather than a transit provider.

Notable

• Registrants are consistent with the announcer, including Mimecast North America Inc, Mimecast Services Limited, and Mimecast South Africa, alongside legacy CenturyLink Communications, LLC blocks.
• The address inventory is finely subdivided into /23 and /24 blocks, reflecting an internal corporate estate segmented by site or function rather than a broad access network.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 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
• 2620:134:6000::/46
• 2620:134:6008::/47

Upstream networks

• AS6461 Zayo Bandwidth
• AS3356 Level 3 Parent, LLC
• AS2914 NTT America, Inc.
• AS12213 Centersquare

Adjacent networks

• AS6461 Zayo Bandwidth
• AS3356 Level 3 Parent, LLC
• AS2914 NTT America, Inc.
• AS12213 Centersquare