Any Web Forwarding record you create will result in an A Record pointing to 204.74.99.100 or a CNAME record pointing to crs.ultradns.net of the same hostname.
204.74.99.100 is the anycast IP address for the web forwarding servers on which we store your web forwards.
It is a required record for your web forwards to function and cannot be edited directly. It will be removed whenever any web forwards that rely on it have been removed.