This always felt like overkill to me. a 4 character alpha-numeric code is 36^4 (1.6M) which is fine for new websites. If you run out, add a 5th character whic

This always felt like overkill to me. a 4 character alpha-numeric code is 36^4 (1.6M) which is fine for new websites. If you run out, add a 5th character which gets you to 60M, and a 6th character gets you 2T.