Any Web Forwarding record you create will result in an A Record pointing to 204.74.99.100, 204.74.99.101 or a CNAME record pointing to crs.ultradns.net of the same hostname.
204.74.99.100 and 204.74.99.101 are the anycast IP addresses 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.