[REQUEST] Field Validation for IP/Hostname

[dogshapedangel]

I'm proposing that field validation be added to the Address field within the plugin, if possible.

The field allows spaces, and it can be hard to identify if a space has been placed before or after an IP address or hostname, as I just learned after 5 minutes of troubleshooting.

At the most basic, validation verifying there are no spaces (or invalid special characters) for an IP or URL.
Even better, validating the formatting of an IP address or verifying a URL has the proper basic formatting.