What fediverse is kbin a part of exactly? Is it a part of the Lemmy network? Or does it have its own network?

What fediverse is kbin a part of exactly? Is it a part of the Lemmy network? Or does it have its own network?

I thought kbin was stand alone. People seem to be comparing it to Lemmy, so I'd imagine they're distinct, but I can't find much information on it.

Any help?

Thanks to whoever chimes in.

#fediverse