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Pro Huge list of domains to choose from
There are over 90,000 domains that can be used.
Pro Supports custom domain
Allows using own domain names.
Pro Includes url/port forwarding
Their built-in Web Forward system allows redirecting URLs (including to a different port).
Con Using a custom domain for free gives everyone access to it
FreeDNS shares all custom domains used across all users, if you're using the free mode. Premium membership allows you to keep your TLD private.