tips on cracking SHA1 hash

[Mem5]

SHA1 hash with salt

First, choose the right mode, speed is not the same for all:

Code:

110    sha1($pass.$salt)
120    sha1($salt.$pass)
130    sha1(utf16le($pass).$salt)
140    sha1($salt.utf16le($pass))

minimise the keyspace

To achieve that, you need to have hints about charset (a-z A-Z etc)/ keyboard used ? For example, a russian keyboard is not the same as an English or a Spanish one. Any weird letters?
If you don't have any clues, I would go for wordlists + rules. If it is really random, you'll need to go for a brutefroce.