With "site:site.com" you can only see if the page is indexED, but to know if it's indexABLE you need to dig deeper. That is why I've decided to automate this process.
As I already told, this gonna be a browser extension, once you got on any page, this ext. automatically checks the page, and show the status (with color, I guess), if this page indexed, if not - it shows if its indexABLE. When I'm looking for linkbuilding resources, this little tool should help a lot