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How to find the thumbprint/serial number of a certificate?

Note: This article assumes you have access to: the CRT file, the certificate via IIS, IE, MMC or OpenSSL.

Windows (MMC, IE, IIS)

  1. Open Certificate to the General Tab. - MMC:
    Add/Remove Snap-in -> Certificates -> Add -> Close -> Expand (Click '+' Sign) Certificates - Local Computer -> Personal -> Certificates -> Double-Click on a certificate to open.
    - IIS 5 & 6:
    Right-Click website -> Left-Click Properties -> Directory Security -> View Certificate
    - IE:
    Tools -> Internet Options -> Content -> Certificates
  2. Click on Details
  3. Be sure that the Show drop down displays All
  4. Click Serial number or Thumbprint. Depending on what you're looking for.
  5. Use combination CTRL+C to copy it.

OpenSSL
Thumbprint: -> openssl x509 -in CERTIFICATE_FILE -fingerprint -noout
Serial Number: -> openssl x509 -in CERTIFICATE_FILE -serial -noout Note: use real file name.

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