The domain should be back up within the next few hours.

I had the domain set on auto-renew but unfortunately something went wrong, and I didn't get an email from the registrar about it (or it got misrouted to spam).

I've renewed the registration but it seems to be taking a while to propagate back to the .IN servers. An interim measure is setting an /etc/hosts record for pinboard.in to 64.62.134.190.

My sincere apologies for the outage. The TLS cert for Pinboard renews in October, and in my mind I thought the domain renewed at that time as well, or I would have paid closer attention. Irked at my own carelessness here.

If you add the IP to your hosts file, the site still seems to work.