Hi, @jeffwalsh, that site no longer exists on our service. The DNS hosting for that domain is at Netlify.
However, it hasn’t been added to any Netlify sites at this time (under Site Name > Settings > Domain management > Custom domains).
Did you delete the site?
If you want us to keep troubleshooting this, please let us know. If so, what DNS records are not working and/or which site was this custom domain added to?