Is there a way to see if an xbox live code is valid

Is there a way to check if an xbox live code is valid? my brother threw old and new xbox live codes in a pile(there are about 20 codes) and i dont feel like putting everyone in the xbox. if there is a way to check if it is valid plz reply

i dont know but if u send me 5 of them ill check tell u wich ones work and which dont but i have to be able to keep one