Click OK. Not After: Date after which the certificate is not valid. It is therefore piped to cut -d'=' -f2 which splits the output on the equal sign and outputs the second part - 0123456709AB . Algorithm Identifier: Signature algorithm used by the certificate signer. Select the date cells, and right click to display context menu, select Format Cells. Convert date to serial number with Format Cells. Serial Number: 256 (0x100) On others, I get one which looks like this. 2. Inside here you will find the data that you need. SSL Certificate Decoder What it does? For a integer ( in decimal or hex, or anyother base ), DER encoding have a negative serial number, we treat it as positive integer and convert it to The bn strng is written in xml signature as certificate serial number. With this tool we can get certificates formated in different ways, which will be ready to be used in the OneLogin SAML Toolkits. In the Format Cells dialog, under Number tab, select General from the Category list. Text Function│Data Formatting. The result of usage "certificate.getSerialNumber()" differs from the expected. Issuer Name: Name of the issuer of the certificate. Not Before: Date before which the certificate is not valid. If the dates in the file display as serial numbers, you can format them into any date formats; or you can use the Text Function to convert them to the date format.. Brian Proposed as answer by Brian Komar [MVP] Tuesday, October 18, 2016 5:12 AM This is just a representation choice for presentation purposes. Serial Number: 41:d7:4b:97:ae:4f:3e:d2:5b:85:06:99:51:a7:b0:62 The certificates I create using openssl command line always look like the first one. You will still need to separate the Private Key (.PVK) and certificate (.DER) files, but serial number format is now irrelevant. Sometimes we copy and paste the X.509 certificates from documents and files, and the format is lost. In cryptography, X.509 is a standard defining the format of public key certificates. on different certs, on some I get a serial number which looks like this. Note: The thumbprint of a certificate in Mozilla is considered the SHA1 Fingerprint. 1. It generates certificate signing request (CSR) and private key Save both files in a safe place When a certificate is created by cfssl it stores the serial number as a Decimal entry while the serial number is stored as hex in the cert it self. Enter Mozilla Certificate Viewer Mozilla Certificate Viewer. I need to get serial number of x509 certificate. Serial Number: Serial number of the certificate. certificate serial number hex to decimal converter. openssl x509 -noout -serial -in cert.pem will output the serial number of the certificate, but in the format serial=0123456709AB. Dates are stored as serial numbers in Excel and they can be switched from one format to another. 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