All MailChimp Sending IP Addresses

I regularly get asked to provide the IP addresses that MailChimp use to send email campaigns. These IP addresses are often used by organisations to white-list incoming MailChimp send messages.

How many IP addresses do MailChimp use and what are they?

MailChimp send your email marketing from any of 86016 IP addresses. The CIDR ranges are:

• 205.201.128.0/20
• 198.2.128.0/18
• 148.105.0.0/16

The full list of individual IP addresses that MailChimp uses may be downloaded from the following files:

• 65536 addresses – IP address range: 148.105.0.0-148.105.255.255
• 16384 addresses – IP address range: 198.2.128.0-198.2.191.255
• 4096 addresses – IP address range: 205.201.128.0-205.201.143.255