Sorry to dissapoint in case you arrived late to the party, but do not expect this to work. While I haven't ran this program in about 6 years, I assume it can still scan for accounts; however I don't expect that you can do much with the output.
This will scan Steam accounts within a certain range and if they have no set up their Steam Community profile then it will log that account Steam id. I am not responsible for what you do with this.
Credits for the original idea goes to lukeryuri/phoenixdoom. They have their own project that I recommend you also check out! https://github.com/hvze/steam-gen
Log file example:
ChrisRPG
ChrisRPG@hotmail.com
STEAM_0:0:5004
lee2leee
lee2leee@hotmail.com
STEAM_0:0:5007
ShoTTy
ShoTTy@hotmail.com
STEAM_0:0:5011
eclipze
eclipze@hotmail.com
STEAM_0:0:5013
scorpion_lgg
scorpion_lgg@hotmail.com
STEAM_0:0:5022