Just like the SNES before it the N64, or to be precise the N64DD, came with its very own online service: the Randnet. The service allowed players to game online, browse the web and download unreleased games. It utilized the N64DD data storing abilities, the N64 4-Mega RAM expansion and the N64 modem to provide with a pretty lovely online gaming experience.
Interestingly, you can now grab a complete and rare Nintendo N64DD Randnet system via eBay. You'll be getting the 64DD Randnet System Starter Kit itself, the N64 modem, the Randnet disk, 8 games, a mouse, a microphone, the capture cassette, a bag, promo documents and more. Seller ships worldwide.