How do I increase the maximum amount of players in a server or host?

I want to host massive raid servers for Borderlands 2, like 30 or so players. I have tried searching it but all I find is LEVEL CAP or 4 player co-op. D:

I want to farm for Vermivorous the Invincible with high spawn rates.


Sorry, but the maximum number of players you can have in a room is 4. This isn't a super-customizable game like Counter-Strike.