but why exactly do you need to know this information?
A few reasons:
1) Search for your lost file/email with your key by gaining a major piece of the key
2) Verify the validity of keys
3) Be a prick and scare people (see:
Woodland_Creature) into thinking their keys are compromised
(Those key IDs are valid but the keys are not real; keys
never have these characters: I 1 0 O)