The following are the IP addresses used by Mailchimp to send email campaigns as at February 2017. Please see the attached file for a list of all 86,017 individual IP addresses..
CIDR 205.201.128.0/20
4096 IP addresses
IP address range: 205.201.128.0-205.201.143.255
CIDR 148.105.0.0/16
65536 addresses
IP address range: 148.105.0.0-148.105.255.255
CIDR 198.2.128.0/18
16384 IP addresses
IP address range: 198.2.128.0-198.2.191.255
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