Shameless plug :)
https://www.merklemap.com/search?query=ycombinator.com&page=...
Entries are indexed by subdomain instead of by certificate (click an entry to see all certificates for that subdomain).
Also, you can search for any substring (that was quite the journey to implement so it's fast enough across almost 5B entries):
Any insights you can share on how you made search so fast? What kind of resources does it take to implement it?
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The first page of results doesn't include ycombinator.com. I get `app.baby-ycombinator.com`, `ycombinator.comchat.com`, everything in between.
Substring doesn't seem like what I'd want in a subdomain search.