What is default cipher of Configuration Utility

I think we may have misunderstood your question. You were actually asking for the list of ciphersuites defined for the Configuration Utility as it comes with a specific BIG-IP release, not the list of ciphersuites as represented by the keyword "DEFAULT".

Please see the following:

K13405: Restricting Configuration utility access to clients using high-encryption SSL ciphers (11.x)

and follow the links in the article for information about other releases.