On A Mac

In Safari

1. To identify the PIV cert select the non-email certificate and scroll down to verify the NT Principal Name
2. The PIV cert will have an NT Principal Name that is a 16 digit number followed by @ mil.

In Google Chrome

1. Click the 3 vertical dots at the upper right and navigate to Settings > Security > Manage Certificates
2. Under the Personal tab select a certificate that has DOD ID in the Issued By column and then click View.
3. Under the Details tab scroll to the bottom of the list to find Key Usage. The PIV certificate has a Key Usage of Digital Signature (80) only, it will not say Non-Repudiation.
4. At the top of the Details tab look for the Serial number of your PIV cert, for most users this will be an easy way to identify the certificate.