IP Addresses for my scheduled processes?

Hello, I am automating posting to a wordpress site using XMLRPC...most of the time it works, but other times Wordpress blocks my login attempts for security reasons.

Is there a range / collection of IP addresses that I can submit to a whitelist?

The error I'm getting in my scheduled process log:

wordpress_xmlrpc.exceptions.ServerConnectionError: <ProtocolError for 403 Forbidden>

Sorry for the slow reply on this! Unfortunately there isn't really a good range we can give you; our servers are all on Amazon AWS, which of course has a very large range of IPs assigned to it. But we only use fixed IPs for specific machines which need them for incoming connections, for example HTTP(S) and SSH.