Transform Engine: FPE for IP Addresses - Alphabet definition


I try to use FPE throug Transform engine to anonimize IP addresses.

I got the template that match my needs in the form of:


This will, for the value, give me four groups such as “127”, “0”, “0”, “1”.

The difficulty is that want a valid IP address as output (ie. where each group is resolved into a 0 to 255, possibly 254, range). Problem the alphabet seems to be formed of single UTF-8 characters. If I put numeric, I might have an output of 999.741.645.2 which is not a valid IP address.

Any suggestion?