US Government Classified Internet Networks – The Real Deep Web



NIPRNet is a low-security network reserved for unclassified information, such as regular Internet websites and firewalled but unclassified military websites.


According to the U.S. Department of State Foreign Affairs Manual, “OpenNet is a physical and logical Internet Protocol (IP)-based global network that links the Department of State’s Local Area Networks (LANs) domestically and abroad. The physical aspect of the network uses DTS circuits for posts abroad, FTS-2001-provided circuits, leased lines, and dial-up public switch networks. This includes interconnected hubs, routers, bridges, switches, and cables. The logical aspect of the network uses Integrated Enterprise Management System (NMS) and TCP/IP software, and other operational network applications. OpenNet is a Sensitive But Unclassified (SBU) network, which supports e-mail and data applications.”


OpenNet+ is described for State Department use as using standard domain names, which must be requested through a State Department intranet site at . Web site development cannot be done on machines directly connected to this network. The “www” prefix is not to be used on OpenNet+, as it is reserved for use on the Internet.


OSIS was the name of an “unclassified network serving the intelligence community with open source intelligence”. Originally used to refer both to the network and to the content it provided, it has since been decoupled, with the content named “Intelink-U”, while the network continues as DNI-U. The network is maintained by the DNI-CIO Intelligence Community Enterprise Services office (ICES).


ClassNet domain names for the State Department take the form “”. Web pages for ClassNet may be developed on a “classified workstation”. “Any workstation used for development purposes may not serve as the operational repository of images, files, or other information associated with a Web site.”ClassNet is used for telecommunications, and its use is promoted by the Business Center Division.Two versions of the State Messaging and Archival Retrieval Toolset (SMART) database were created, one with a maximum rating of Sensitive but Unclassified (SBU) for OpenNet+, and one with a top rating of Secret for ClassNet.


SIPRNet is a medium-security network for handling information classified Secret or below. It may be used to access classified websites run by the Defense Intelligence Agency. SIPRNet replaced the Defense Data Network DSNET1 component.


NSANet handles information rated Top Secret or Sensitive Compartmented Information.


The Joint Worldwide Intelligence Communications System (JWICS) is a secure TCP/IP network providing services such as hypertext and e-mail rated up to Top Secret and SCI. JWICS replaced the Defense Data Network DSNET2 (Top Secret) and DSNET3 (SCI) networks.


SI = Special / Secret Intelligence TK is a codeword classification, standing for Talent Keyhole, meaning IMINT. TS/SI/TK is often used as a blanket “entry level clearance” for conferences, etc., as it is one of the most carefully controlled and restricted. B = BYEMAN (National Reconnaissance Office)

  • Military Network (MILNET) for Unclassified traffic
    Defense Secure Network One (DSNET 1) for Secret traffic
    Defense Secure Network Two (DSNET 2) for Top Secret traffic
    Defense Secure Network Three (DSNET 3) for Top Secret/Sensitive Compartmented Information (TS/SCI)