I do something similar for AWS IPs in our iptables firewalls. I create an ipset for "aws", and then create rules that match that ipset. I then have a script t

I do something similar for AWS IPs in our iptables firewalls. I create an ipset for "aws", and then create rules that match that ipset. I then have a script that runs periodically and downloads the set of AWS IPs (AWS publishes that) and writes then runs the script that creates the ipset.