apr_ipsubnet_create accepts "128" as a subnet mask for IPv6 addresses but not "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff". The equivalent IPv4 values of "32" and "255.255.255.255" are accepted.
Created attachment 20712 [details] Patch to test suite Adds some tests for this behaviour. Lines 16 and 33 of the patch cause test failures.