There are several online services that allow you to determine whether a server is affected with this vulnerability and others for testing ssl versions and certificates in servers and domains, such as ssllabs fror qualys.
In these links, we can some services for doing this kind of testing:
The qualys online service returns the results in the form of a report where we see possible problems that the version of openssl that the server is using:
We can also see in detail the SSL/TLS version and information about possible vulnerabilities:
With the Shodan ...
