Continuing the discussion from LetsMonitor.org v2.0 - free certificate monitoring:
If you’re after free “fair use limits only” (a few thousands certificates now) monitoring, please try our https://keychest.net . All you need to enter is your registered domain and the tool will automatically start watching new subdomain servers as you issue first certificate for them.
KeyChest has a limited set of monitor types focused on certificates and servers’ up-time, we do DNS check, certificate trust chain, domain name check, expiry. Displaying results for all IP addresses is on its way.