This site is running IP 1.2.3.30
Latest phpbb2 is 2.0.23
Latest phpbb3 is 3.0.3
So: ( 1.2.3.30 + 2.0.23.0 + 3.0.3.0 ) / 3 =
Depending how we make the maths, we can get:
2.0.94.43.33.33.33.33.33.33.33.33.33.33........... (periodic 33)
209443,33333333333333333333333333
The first for the version and the second for the build number
Now, making nosense operations:
1.1.86.3.3.3.3.3.3.3.3.3.3.3.3.3.3.........
11863,333333333333333333333333333
:rotfl:
Opss

, I forgot it was only for the phpbb core, so:
Latest phpbb2 is 2.0.23
Latest phpbb3 is 3.0.3
Let's make maths again!:
( 2.0.23 + 3.0.30 ) / 2 =
Results:
2.5.26.5 (version #)
2526.5 (build #)
Again, with no sense operations:
1.1.63
1163
Solution: As it is a phpbb2/phpbb3 merge, the one that makes more sense is 2.5.26.5

The site is executing phpbb 2.5.26.5

Please do not ask how I made those operations; I have no idea.
