Adding an IP address to the allow list automatically excludes all other IPs.
Below (second list) is the "Allowed IP Addresses" for ColdFusion administrator.
Regaining access if locked out
If needed you can add an IP address to the /opt/coldfusion11/cfusion/lib/neo-security.xml file and restart ColdFusion to regain access.
Example of Error received after logging in but not being added to the allow list.