Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

El_Bendecido_12's avatar
El_Bendecido_12
Icon for Altostratus rankAltostratus
Apr 15, 2019

Why serial number is like mac address

I just renewed the certificate with tmsh and all was good but after that i got this serial number df:b1:f1:e0:8a:eb:0a:00

 

  1. Why it looks like mac address?
  2. Will i have trouble with this?

1 Reply

  • Lee_Sutcliffe's avatar
    Lee_Sutcliffe
    Icon for Nacreous rankNacreous
    Apr 16, 2019

    The serial number is a positive integer assigned by the CA to certificate. It is unique for each certificate issued.

     

    The integer is referenced as Hexadecimal for ease of readability (this is why it looks like a MAC address - A MAC address is referenced as a 48 bit hex number)

     

    No, this will not cause you any problems.