Fairly new to this so apologies if going over old/dumb ground. I've just set up a co lo'd server and am trying to point my domain names at it, I have tested it out with free domains from dyndns.org which work fine but when trying to change the a-record in my domain name host control panel I get the following error: -
"The IP address for the A record you entered (217.xx.xxx.xxx) was invalid"
Is this a problem their end or am I doing something incorrectly? What is classed as a valid/invalid IP for an A record?