Tactical Systems

Systems for airborne, ground, and surface platforms

Identification Friend or Foe (IFF)

Identification Friend or Foe...
About IFF
BAE Systems’ innovative Identification Friend or Foe (IFF) solutions have led the world for more than 75 years, and are already leading into the next generation.

Military pilots and C4ISR leaders know that proven, up-to-date IFF aircraft identification systems provide time-critical insights that reduce friendly fire incidents, support mission success, and save lives. That’s true in the air, on ships, and on the ground – especially in hostile environments. BAE Systems has been a leader in IFF systems technology worldwide for more than seven decades, having delivered over 14,000 transponders, 1,500 interrogators, and 6,000 combined interrogator transponder systems for use across a multitude of platforms.

Available for all service branches, our IFF systems can enhance the safety and operational tracking of legacy, new, and emerging platforms including unmanned aerial vehicles, ships, fixed-wing aircraft, and helicopters. They can also replace outdated systems with small form factor units that support SWAP-C objectives and accommodate future upgrades.

Learn about our Identification Friend or Foe (IFF) products




Identification Friend or Foe (IFF) Transponders

BAE Systems’ next generation IFF Reduced Size Transponder

Our IFF military Mark XIIA transponders allow aircraft and ships to be identified as friendly forces by responding to interrogations from ground-based or airborne IFF systems. The transponders installed on aircraft and naval vessels establish the identity of friendly forces. For SWAP-constrained platforms and to reduce procurement, upgrade, and life cycle costs, see more about our next generation AN/DPX-7 Reduced Size Transponder (RST) below. All of our transponders feature:

  • Flexible interface designed to accommodate retrofit and new installations
  • Modes 1, 2, 3/A, C, 4, S, and ADS-B
  • Mode 5
  • DoD AIMS certified

Identification Friend or Foe (IFF) Interrogators

BAE Systems family of Identification Friend or Foe Interrogators

BAE Systems’ IFF interrogators offer modular architectures for customized configurations and optimized performance for surveillance, air traffic control, and range instrumentation. The AN/APX-41 (C) is the standard U.S. Navy interrogator, with more than 1,000 units delivered. Features include:

  • Operates autonomously, or in conjunction with, a host radar
  • Modes 1, 2, 3/A, C, 4, and S
  • Mode 5
  • DoD AIMS certified

IFF Combined Interrogator Transponders (CITs)

BAE Systems’ IFF Combined Interrogator-Transponders (CITs)

Our Combined Interrogator Transponders are versatile IFF systems for highly mobile platforms, providing today’s and tomorrow’s warfighters with the ability to identify friendly aircraft in a secure environment. Our CITs all feature:

Products: AN/APX-113 (V), AN/APX-125, and AN/APX-126

  • Modes 1, 2, 3/A, C, 4, S (XP only), and ADS-B
  • Mode 5
  • DoD AIMS certified
  • Multiple antenna configurations

Cryptographic Computer and Emulator Products

BAE Systems Cryptographic Emulator

The universal cryptographic computer is used in conjunction with interrogator and/or transponder subsystems to encrypt interrogator challenges, generate transponder encoded replies, and process the coded replies back to the interrogator.

Products: KIV-6 Mark XII IFF Crypto, KIV-77 and KIV-78 Emulators

  • Highly reliable, compact design
  • Loaded with an operational key code each day
  • DoD AIMS certified


Download the Cryptographic Computer and Emulator Products datasheets


Identification Friend or Foe (IFF) Ship Antennas

BAE Systems IFF Ship Antennas

The BAE Systems antenna group supports a wide range of C4ISR systems, including IFF, secondary surveillance radar, and air traffic control radar. This field-proven system is highly reliable, offering constant fleet protection for navies around the world. It features:

Products: OE-120/UPX Antenna Group

  • Instantaneous, multiple target identification
  • Accommodates all standard IFF modes
  • Electronically-steered system architecture


Download the ship antennas datasheet


IFF product literature



Transponder products

Interrogator products


Combined Interrogator / Transponder products


Cryptographic Computer and Emulator Products



Related terms

IFF • IFF Mode 5 • Mode 5 • Mode 5 IFF • Mk XIIA • Mk XIIB • ADS-B • UAT • FVL • Transponder • Interrogator • SAA • IFF Radar • IFF SSR • UAV IFF • Identification Friend or Foe • Transponder • Combined Interrogator Transponder • Interrogator • Mode 5 Level 2 • Mode 5 Level 2 Broadcast • Mode 5 Transponder


Learn more about our Tactical Systems Products below, see our related press releases above, or contact our Identification Friend or Foe business representative today to arrange a meeting.

Tactical Systems

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Secure Communications,
Navigation & Identification

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