CIDR format for IPs

Created by Abderrahim Ibnou el kadi, Modified on Fri, 11 Sep 2020 at 08:33 AM by Jason Carreiro


What is the CIDR format for Proofpoint Security Awareness Training IPs to allow whitelisting in Mimecast?


The CIDR format for our IPs:

Some whitelisting requires that the Subnet Mask of the IP be specified (especially if you're whitelisting a range of IPs vs an individual IP). CIDR is a way to express that subnet mask without writing out all of the octets of the address (such as In this case /32 is designating an explicit IP address, not a range.

See Whitelisting Guide and Whitelisting in Mimecast for additional information.