It’s a bug report:
From the Watchlist, when editing the URL, Distillweb only accepts URL featuring a proper domain name extension (TLD) like .com, .info or .biz
An IP-based URL like https://64.233.160.0 won’t be accepted in the edit box, while the same page can be added through the “Monitor full page” option.
Such URLs were working fine a few months ago with a previous version of Distillweb. I didn’t notice it immediately, so I can’t say from which version it stopped working.
@sgfrance Thank you for reporting the issue. We will fix it in the next release.
A current workaround to monitor it is to use Distill’s browser extension for adding it to the Watchlist. You can then change the device to the cloud to run it on Distill’s server.