This page will easily translate between regular alphabetic text, or a dash-seperated numeric string.
Simply enter some words on the top part and hit the "translate to numbers" button to see what happens.
Alternately, you can enter a bunch of numbers in the bottom section and it will translate them to
regular letters up top.
The Code it uses is a simple A=1, B=2, C=3, X=24, Y=25, Z=26 sequence.