[CentOS] Require option in Apache

So I have read everything that my search foo can find on the require 
option.  I want to specify IP addresses.

The only examples I am finding are in: 
http://httpd.apache.org/docs/2.4/howto/auth.html

And only IPv4 addresses and only dotted aggregation.  No IPv6 examples 
and no CIDR aggregation examples.  In fact, no IPv6 examples at all.

So can anyone point me to some more information on specifying IP 
addresses with this new require option?

thanks