The term "deep packet" inspection is what has been talked about as the source of Iran's strong network censorship. There are other keywords you should watch to see when this technology is present: "payload" inspection and "Layer 7" inspection. This technology is being rapidly developed and marketed by more than one company, and they have set up an industry organization to promote it's use. Three leading companies: Qosmos QOSMOS - Network Intelligence - Deep Packet Inspection Narus Narus Ipoque ipoque :: Bandwidth Management with Deep Packet Inspection - DPI Note that all are fully programmable and interface with other applications. So capabilities of a system as sold "off the shelf" can be modified and enhanced by the purchaser. Reading a white paper spec. on system capabilities and assuming it doesn't have a certain capability could be a bad assumption. One application they mostly claim to provide integration with is this one: NetWitness - Total Network Knowledge™ Other things of note: Narus' installed base: Narus Customer Profile Is there a glowy dot near you? Read the webpages, check out the companies which partner them. Be aware of privacy laws in your own country, and how they apply to network traffic. Most are not as strong as you think, all need to be updated in some areas to cover new technology. Here is the industry webpage: https://www.dpacket.org/ Read their propaganda. Read the advise to lawyers, to ISPs. Read the marketing.