I’m not going to test this because while it could be innocuous, well, it could be harmful as well. If this is hosted in a local network, take your phone or laptop to a place with free WiFi and test. Also make sure the subdomain resolves to an IP address. You can go to cmd in Windows, or open up a terminal and type “ping craigsworld.dedyn.io”. If it’s not a reserved IP and you can access it outside your local network you’re good.