And yes, the subscribe restrictions for domain searches are annoying.
But Troy and family also need to eat, so I understand the need for a payment part, especially for companies.
We just ended up in the grey zone in between. I wish there were some more nuances, but then again, HIBP can't cater for every edge case unless they want to hire lots of devs and customer services.
I ended up signing up for a subscription, checked my domains, and then cancelled the subscription. It felt a little cumbersome, but ok. A non-recurring 2-day access would have worked for me...
As opposed of having facebook@smthg.com only
If so, this is called “email tumbling” and services exist to strip the “per-company” part to expose your main email.
But in the end I settled on facebook@example.com, instagram@example.com, and similar obvious names.
I just added my domain to the site again and I see "2,243 Total Breached Addresses", and "18 Addresses excluding Spam Lists", but I have no idea what they are. Attempting to click the links shows me I need to "upgrade" to see them, and the download of excel and JSON result in 404 errors.
Too bad, I guess if you have only a single email address it might be good to get informed, but if you use a domain with multiple addresses it's way less useful.