$ openssl crl -in test/class3-revoke-2.crl -inform der -noout -text -crlnumber | head
crlNumber=010009
Certificate Revocation List (CRL):
        Version 2 (0x1)
    Signature Algorithm: sha512WithRSAEncryption
        Issuer: /O=CAcert Testsever/OU=http://cacert1.it-sls.de/CN=CAcert Testserver Class 3
        Last Update: Jun  7 00:02:46 2018 GMT
        Next Update: Jun 14 00:02:46 2018 GMT
        CRL extensions:
            X509v3 CRL Number: 
                65545
$ openssl crl -in test/revoke-2.crl -inform der -noout -text -crlnumber | head
crlNumber=124A
Certificate Revocation List (CRL):
        Version 2 (0x1)
    Signature Algorithm: sha512WithRSAEncryption
        Issuer: /C=AU/ST=New South Wales/O=CAcert Testserver/OU=http://cacert1.it-sls.de/CN=CAcert Testserver Root                                                                                                
        Last Update: Jun  7 00:02:44 2018 GMT                                                                                                                                                                     
        Next Update: Jun 14 00:02:44 2018 GMT                                                                                                                                                                     
        CRL extensions:                                                                                                                                                                                           
            X509v3 CRL Number:                                                                                                                                                                                    
                4682