There are a few ways to host Bingo online for free. One option is to use a site like bingo.com or bingo.net.
These sites offer free membership, and you can play for free by downloading their software. Once you have installed the software, you can sign in and start playing.
Another option is to use a service like Play Bingo. This site offers a free trial, and then you pay monthly fees for additional games.
You can also play for free by signing up for a free trial at some of the major casinos online.