The Dark Net is a section of the internet that has been mentioned and appeared in Grand Theft Auto Online.
The Dark Net is a reference to the real life "Deep Web", a section of the internet that is hidden away, and contains many illegal activities, including drug dealing and arms smuggling. It is only accessible through special browsers, the most notorious being the Tor Browser.
The fact that the military is selling the EMP and other military equipment on the Dark Net is likely a reference to the arms smuggling located on it in real life.
|This article or section refers to content in the Xbox One, PlayStation 4, and PC renditions of Grand Theft Auto V and/or Grand Theft Auto Online, that is not featured on the Xbox 360 or PlayStation 3 versions.|
For a complete list of the features of the "enhanced" version of Grand Theft Auto V, please see here.
The Dark Net first appears with the inclusion of the Bikers update. Clubhouses have a laptop with access to an anonymity network which can access the Dark Net. So far, The Open Road is the only Dark Net website that can be accessed.