Adding an ipv6 address to "require ip" in phpmyadmin.conf in linux -

i'm trying edit phpmyadmin.conf in etc/httpd/conf.d/phpmyadmin.conf such allows ip.
have works when router set allow ipv4 addresses:

   <ifmodule mod_authz_core.c>      # apache 2.4      <requireany>        require ip 111.222.333.444        require ip ::1      </requireany>    </ifmodule>    <ifmodule !mod_authz_core.c>      # apache 2.2      order deny,allow      deny      allow 111.222.333.444      allow ::1    </ifmodule> 

i want add ipv6 address, works when add entire ipv6 address (replacing ::1). ie xxxx:xxxx:xxxx:xxxx:xxxx:b95:bdb0:9c2b

however, ipv6 address changes on reboot. want add limited address.

i've tried:
xxxx:xxxx:xxxx?
xxxx:xxxx:xxxx:*
xxxx:xxxx:xxxx/48
, variants of above.

but none work (in fact, phpmyadmin won't restart)

is there way this? :)

the supported syntaxes are, apache 2.2 , 2.4 respectively:

allow 1111:2222:3333:4444::/64  require ip 1111:2222:3333:4444::/64 

the syntax trying missing terminal ::, causing base ipv6 address invalid. (it'd comparable trying write 1.2.3/24 instead of 1.2.3.0/24.)