SSL certificates, SAML certificates, Signing certificates the number is long of different kinds of certificates and you might need to check the name of a certificate, the start or end date or perhaps the thumbprint.
I use the tool mainly to get end dates of certificates sent to me from customers because I hate when they expire and need to be changed without any preparation. And the worst kind that most administrators often miss is the certificates that is auto created i.e. in ADFS servers, Azure Enterprise apps, Okta
With Certinfo it super simple to check a certificate CertInfo.exe -file <path to file> -enddate will print the end date and time on the console. Or you can do CertInfo.exe -cert <Base64 of cert> -subject and you will get the subject of the cert.
In version 2 I’ve also added -url as a parameter to get the certificate directly of the webserver.
Version 3 this version have a new parameter called -urlfile it takes an text file with webserver adresses or ip adresses separated with newline and will return the info from all of them.
Version 4 has a parameter to get the info saved in a csv format. also the property -urlinfo to print out the url send in to the command. also the parameter -urlfilestring this enabled you to add a semicolon after the url in a text file and print out this for each line, good when you do a csv printout.
And finally a fix is applied to prevent redirect this is to get the cert from the server that is requested even if it redirects the request.