dns-admin@ is probably from the whois record of the domain you checked. The predefined list is only the last 4 addresses that are shown: security@, hostmaster@, postmaster@ and webmaster@.
> 3.2.2.4.4 Constructed Email to Domain Contact
> i) sending an email to one or more addresses created by using 'admin', 'administrator', 'webmaster', 'hostmaster', or 'postmaster' as the local part