Intervals On The Guitar Neck

Using this chart below you should be able to play and therefore hear every interval on the guitar.

All on the same neck
The diatonic intervals are shown in black and should be memorised first - you should be able to work out the others just from them. Notice too that it is laid out around the Major Scale Position 1. I would suggest that in the longterm you learn all the intervals in all 5 of the CAGED Major Scale shapes so you understand the 'quality' of every note you play - but start with this and at least you'll be able to play and hear all the chromatic intervals!

Ear Training - Reference