What type of hash is this?
 

I've been searching and I haven't had any luck. e978ef3145d99b7947900b828a382fc6:50 is the hash it=123456 dehashed.

MD5? Im no expert on encryption, but thats what it looks like...

That's what I would have said, but MD5 uses just hex numbers - and there's a : in the hash - that and I tried to MD5 the string "123456". It'd help if we had some kind of guarantee that it was a common/wellknown hash algorithm. Otherwise, I can write a hash algorithm that says "anything hashes to your big string" and get the same results.

It could be SHA-0 or SHA-1, those might be worth trying.

Out of curiosity, why do you need to know what hash algorithm this used?

I figured it out, the e978ef3145d99b7947900b828a382fc6 is MD5 the 50 means it will be 50123456 dehashed.

hash browns?

;)

as bryan said, it's the MD5 of the prefix after the colon + the plaintext
ie md5(50xxxxx)