{"id":26681165,"date":"2026-10-05T11:53:01","date_gmt":"2026-10-05T09:53:01","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/iff-identification-friend-or-foe-explained-military-jets\/"},"modified":"2026-10-05T11:53:50","modified_gmt":"2026-10-05T09:53:50","slug":"iff-identification-friend-or-foe-explained-military-jets","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/it\/iff-identification-friend-or-foe-explained-military-jets\/","title":{"rendered":"IFF Explained: How Military Jets Tell Friend From Foe"},"content":{"rendered":"\n<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\n<!-- mfsh:top -->\n\n<style>\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid 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It might be a friendly fighter coming home, an airliner, or an enemy bomber. Get it wrong one way and an enemy slips through. Get it wrong the other way and you shoot down your own people.<\/p>\n<p>The system that is supposed to settle the question is called IFF, short for Identification, Friend or Foe. It has been around since the Second World War, it is in almost every military aircraft flying today, and its civilian offspring is in every airliner. Here is how it works, and why it is still not a magic answer.<\/p>\n\n<div style=\"background:#f4f6f9;border:1px solid #e2e7ee;padding:18px 22px;margin:22px 0 26px\"><p style=\"margin:0 0 8px;font-weight:700;color:#0d1117\">Quick Facts<\/p><ul style=\"margin:0;padding-left:18px\"><li style=\"margin:4px 0\"><strong>What it is:<\/strong> An interrogator sends a coded challenge; a transponder on a friendly aircraft sends back a coded reply<\/li><li style=\"margin:4px 0\"><strong>Origins:<\/strong> British radar development before and during the Second World War<\/li><li style=\"margin:4px 0\"><strong>Current NATO standard:<\/strong> Mark XII \/ Mark XIIA, with encrypted Mode 4 and Mode 5<\/li><li style=\"margin:4px 0\"><strong>Civil spin-off:<\/strong> Modes 3\/A, C and S are the transponder codes used by air traffic control<\/li><li style=\"margin:4px 0\"><strong>Key limit:<\/strong> IFF can positively identify a friend, but no reply does not prove an enemy<\/li><li style=\"margin:4px 0\"><strong>Target date:<\/strong> Under STANAG 4570, all NATO interrogators and transponders are expected to be Mode 5 capable by 2030<\/li><\/ul><\/div>\n\n<h2 style=\"padding-top:22px\">A blip with no name<\/h2>\n<p>The problem arrived with radar itself. When Britain's Chain Home stations began watching the skies before the Second World War, operators could see aircraft long before anyone could see them with the naked eye, but they could not tell whose they were. Aircraft were flying too fast and too high to identify visually, and on the screen they were just featureless blips.<\/p>\n<p>The cost of that became clear in the very first days of the war. On 6 September 1939, in what became known as the Battle of Barking Creek, RAF fighters were scrambled against radar plots that turned out to be British aircraft. Spitfires shot down two Hurricanes, killing one pilot, the first British fighter pilot to die in the war.<\/p>\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/XCXxQNCEQZ4\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\n\n<p style=\"font-size:14px;color:#666;font-style:italic\">The Ops Center explains IFF and secondary surveillance radar.<\/p>\n<h2 style=\"padding-top:22px\">Challenge and reply<\/h2>\n<p>Early British experiments tried to make friendly aircraft simply reflect radar more strongly, which did not work reliably. The answer was an active transponder. The first, the IFF Mark I, was used experimentally in 1939. It picked up the radar pulse and sent a stronger signal straight back, making a friendly aircraft's blip on the screen longer and easy to spot. The Mark II followed in 1940, and the Mark III became the standard for the Western Allies for most of the war.<\/p>\n<p>The principle has not changed since. A ground radar, a ship or a fighter carries an interrogator, which sends out a coded challenge. A friendly aircraft carries a transponder, which hears the challenge and sends back a coded answer. The interrogator links that answer to the radar contact, and the blip gets a label. IFF sets were so secret during the war that many were wired with explosives, to be destroyed if the aircraft came down.<\/p>\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/hazeltine-an-apx-6-iff-transponder-1950.jpg\" alt=\"A Hazeltine AN\/APX-6 IFF transponder from 1950 on display at the National Electronics Museum\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A Hazeltine AN\/APX-6 IFF transponder, introduced in 1950, at the National Electronics Museum in Maryland. Photo: Daderot via Wikimedia Commons (CC0).<\/figcaption><\/figure>\n\n<h2 style=\"padding-top:22px\">Modes, codes and airliners<\/h2>\n<p>After the war, IFF went digital in a modest way. The Mark X system introduced numbered modes. Mode 1 identified the type of aircraft or mission, and Mode 2 returned a code for the individual airframe. As civil aviation boomed in the 1950s, airliners were given slightly modified sets too. Mode 3, known to civilian users as Mode A, returns the four-digit code a pilot sets when air traffic control assigns a \"squawk\". Mode C added altitude, saving radar stations the cost of measuring height themselves.<\/p>\n<p>That is the hidden military history behind every airliner transponder. Mode S, introduced in the 1980s, carries much more data and is the basis of the collision avoidance systems on modern airliners.<\/p>\n<p>Simple codes have a weakness, though: anyone can send the challenge. An enemy can trigger a transponder and use the replies to locate the aircraft. The current military standard, Mark XII, added Mode 4, an encrypted challenge that only gets an answer when the codes match, with a changing delay on the reply to make tracking harder. Its successor, Mode 5, is an encrypted military version of the Mode S data. Most NATO members began upgrading to Mode 5 around 2016, and the alliance expects every interrogator and transponder to be Mode 5 capable by 2030.<\/p>\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/DmNKsFTwaQE\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\n\n<p style=\"font-size:14px;color:#666;font-style:italic\">Thales, one of the main IFF manufacturers, on how the system works.<\/p>\n<h2 style=\"padding-top:22px\">Why IFF cannot prove an enemy<\/h2>\n<p>IFF has one fundamental limit, and it has cost lives. It can tell you that a contact is friendly. It cannot tell you that a contact is hostile. A missing or wrong answer might mean an enemy, but it might also mean a broken transponder, a wrong code, or a civilian light aircraft that does not carry one.<\/p>\n<p>The most painful example came on 14 April 1994, over northern Iraq during Operation Provide Comfort. Two US Air Force F-15s, under the control of an AWACS aircraft, intercepted two helicopters in the no-fly zone. The pilots interrogated them on their IFF, got no reliable friendly reply, misidentified them as Iraqi Mi-24 Hinds and shot both down. They were US Army UH-60 Black Hawks. All 26 people on board were killed. The helicopters had been squawking the wrong Mode 1 code for the zone, after being given an incorrect one. The then US Secretary of Defense summarised what went wrong.<\/p>\n\n<div style=\"background:#f8f9fa;border-left:4px solid #d32f2f;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;The F-15 pilots misidentified the Black Hawks, the AWACS crew failed to intervene, Eagle Flight and their operations were not integrated into the Task Force, and the IFF systems failed.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>William Perry<\/strong> &mdash; US Secretary of Defense, on the 1994 Black Hawk shootdown, as quoted on Wikipedia<\/div><\/div><\/div>\n\n<p>That is why IFF is only one part of what the military calls combat identification. Pilots and controllers also use rules of engagement, flight plans, datalinks, electronic signatures and, when possible, a visual look before anyone fires.<\/p>\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/usaf-technician-iff-transponder-test-2001.jpg\" alt=\"A US Air National Guard avionics technician checking an aircraft transponder with an IFF test set\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">An avionics technician of the Virginia Air National Guard's 192nd Fighter Wing checks an aircraft transponder with an IFF test set in 2001. US Air Force photo via Wikimedia Commons (public domain).<\/figcaption><\/figure>\n\n<h2 style=\"padding-top:22px\">Still essential<\/h2>\n<p>For all its limits, IFF remains one of the most important boxes in a military aircraft. Without it, a crowded sky full of friendly jets, tankers, drones and airliners would be almost impossible to manage. New aircraft are still being fitted with the latest Mode 5 equipment, and setting the right IFF codes is part of planning every military mission. On a radar screen, being recognised as a friend is a matter of life and death.<\/p>\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/oLnq-0PyG7o\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\n\n<p style=\"font-size:14px;color:#666;font-style:italic\">Battleship New Jersey explains IFF.<\/p>\n<p>And how the 1994 shootdown was reported at the time.<\/p>\n<p>Archive news footage from the Associated Press.<\/p>\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/OU1OtM6aFwo\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\n\n<p><em>Sources: Wikipedia (Identification friend or foe, Battle of Barking Creek, 1994 Black Hawk shootdown incident), US Department of Defense, NATO STANAG 4570, The Ops Center, Thales, AP Archive<\/em><\/p>\n<!-- mfsh:bottom -->\n\n<button type=\"button\" class=\"mfsh-trigger mfsh-bottom\" data-mfsh-placement=\"bottom\" aria-haspopup=\"dialog\"><svg><use href=\"#mfsh-i-share\"\/><\/svg>Share this story<\/button>\n\n<!-- \/mfsh:bottom -->\n\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\n\n\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What is IFF in military aviation?<\/summary><div class=\"a\">IFF, short for Identification, Friend or Foe, is a system in which an interrogator sends a coded radio challenge and a transponder on a friendly aircraft sends back a coded reply. It lets radar operators and pilots identify friendly aircraft on their screens.<\/div><\/details><details><summary>Can IFF identify an enemy aircraft?<\/summary><div class=\"a\">No. IFF can only positively identify a friend. A missing or invalid reply does not prove that a contact is hostile, because a friendly aircraft may have a faulty transponder, the wrong code set, or be a civilian light aircraft without a transponder.<\/div><\/details><details><summary>What is IFF Mode 5?<\/summary><div class=\"a\">Mode 5 is the latest military IFF mode, a cryptographically encoded version of the civilian Mode S data. Most NATO members began upgrading to it around 2016, and under STANAG 4570 every NATO interrogator and transponder is expected to be Mode 5 capable by 2030.<\/div><\/details><details><summary>What is the difference between IFF and a transponder?<\/summary><div class=\"a\">The transponder is the airborne part of an IFF system: it receives challenges and sends replies. Civil transponders using Modes 3\/A, C and S grew out of military IFF and are used by air traffic control to identify aircraft and their altitude.<\/div><\/details><details><summary>When was IFF invented?<\/summary><div class=\"a\">IFF was developed in Britain alongside radar just before and during the Second World War. The first active IFF transponder, the Mark I, was used experimentally in 1939, followed by the Mark II in 1940 and the Mark III, which became the standard Allied system.<\/div><\/details><details><summary>What happened in the 1994 Black Hawk shootdown?<\/summary><div class=\"a\">On 14 April 1994 over northern Iraq, two US Air Force F-15s misidentified two US Army UH-60 Black Hawk helicopters as Iraqi Mi-24s and shot them down, killing all 26 people on board. IFF failures, AWACS control failures and poor integration of helicopter operations all contributed.<\/div><\/details><\/div><\/section>\n\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is IFF in military aviation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"IFF, short for Identification, Friend or Foe, is a system in which an interrogator sends a coded radio challenge and a transponder on a friendly aircraft sends back a coded reply. It lets radar operators and pilots identify friendly aircraft on their screens.\"}},{\"@type\":\"Question\",\"name\":\"Can IFF identify an enemy aircraft?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. IFF can only positively identify a friend. 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IFF failures, AWACS control failures and poor integration of helicopter operations all contributed.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/f-16-bae-an-apx-127-iff-combined-interrogator-transponder-aims-certified-2026\/\">F-16 Gets New Friend-or-Foe System: BAE AN\/APX-127 Certified<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/combat-air-patrol-cap-explained-barcap-migcap-noble-eagle\/\">Combat Air Patrol Explained: What a CAP Is and Why Fighters Orbit<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/tacan-explained-tactical-air-navigation-military-jets\/\">TACAN Explained: How Military Jets Find Their Way Home<\/a><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Share this story On a radar screen, every aircraft looks much the same: a blip. It might be a friendly fighter coming home, an airliner, or an enemy bomber. Get it wrong one way and an enemy slips through. Get it wrong the other way and you shoot down your own people. The system that [&hellip;]<\/p>\n","protected":false},"author":25,"featured_media":26675531,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[664],"tags":[],"class_list":["post-26681165","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>IFF Explained: How Military Jets Tell Friend From Foe | Afterburner - MiGFlug&#039;s Magazine<\/title>\n<meta name=\"description\" content=\"What is IFF? 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