Teleseer is a passive network intelligence platform designed for government, defense, and civilian security operations. It provides real-time network visibility and situational awareness without the use of agents or active scanning, making it non-disruptive to production environments. The platform is capable of operating on-premises and fully offline, catering to air-gapped or classified environments. It supports use cases across defense intelligence, federal/civilian IT security operations, and state/local IT/OT environments. Teleseer enables continuous behavioral monitoring of network devices, traffic visibility, and asset discovery. Its digital twin technology assists hunt teams in understanding unknown host environments with limited data available. The platform also includes integrated threat analysis capabilities for identifying threats across the network terrain. Hardware appliances are available as fly-away kits for field deployments: - Scout™: Ultra-portable backpack-sized kit with a 24-core Intel Core i9 CPU, 64 GB ECC memory, 32 TB NVMe storage, and 10 Gbps capture. - Hawk™: Carry-on/rack-mountable sensor with an 84-core AMD EPYC 9554 CPU, 768 GB ECC memory, 307 TB NVMe storage, and 40 Gbps capture. - Prime™: Fixed deployment sensor with a 128-core dual AMD EPYC 9554 CPU, 1024 GB ECC memory, 112 TB NVMe storage, and 100 Gbps capture. All hardware appliances are TAA-compliant. Teleseer has been used by or in collaboration with the US Air Force, AFWERX, Defense Innovation Unit, and US Space Force.