Irans Missile Arsenal: From Reverse-Engineered Scuds to Precision Hypersonics

How does a country under decades of crippling sanctions build one of the world's largest missile arsenals? The answer starts not in a laboratory but in a city under bombardment.

In early 1988, during the final months of the Iran-Iraq war, Iraqi Al-Hussein missiles slammed into Tehran in what became known as the War of the Cities. Over the course of that conflict, Iraq fired more than 500 ballistic missiles at Iranian cities, with Tehran alone absorbing 118 strikes over 52 days. The attacks killed more than 2,000 civilians and injured over 11,000. Apartment buildings collapsed. Families fled. And Iran's military, locked in an eight-year war that had already consumed hundreds of thousands of lives, had almost nothing to fire back.

Iran had managed to acquire a small number of Scud-B missiles from Libya and Syria earlier in the war - roughly 20 from Libya in 1985 and at least 12 from Syria in 1986 - and had begun receiving larger shipments from North Korea in mid-1987. But these were handfuls of weapons against a sustained barrage. The helplessness of those months imprinted itself on Iran's strategic DNA. When the war ended in August 1988, a national consensus had formed within the military and political establishment: missile capability was not optional. It was survival.

Copy First, Understand Later

Where do you start when you want to build ballistic missiles from scratch? You do not start from scratch. You copy.

Iran's first generation of missiles came directly from North Korean workshops. The Shahab-1 was essentially a rebadged Scud-B, a Soviet design from the 1960s, with a range of roughly 300 kilometers. The Shahab-2 corresponded to the North Korean Hwasong-6, an extended Scud variant reaching approximately 500 kilometers. Both used the same class of toxic liquid propellants as the original Soviet designs.

The real ambition showed in the Shahab-3, based on North Korea's Nodong-1 missile. With a range of approximately 1,300 kilometers, it could reach Israel for the first time. Iran first tested it in July 1998, though that initial launch ended in failure when the missile exploded roughly 100 seconds after liftoff. It entered service in the early 2000s.

But range alone does not make a weapon useful. The Shahab-3's accuracy was dismal. Its circular error probable, or CEP, was estimated at roughly 2,500 meters, with some Western intelligence assessments suggesting it could be as poor as 4,000 meters. That means half of all missiles fired would land within a 2.5-kilometer radius of the target. Against a city, that delivers terror. Against a military installation, that delivers noise.

So why copy at all? Because reverse-engineering teaches you the fundamentals. You learn how combustion chambers withstand extreme pressures, how guidance systems process sensor data mid-flight, how airframes survive the violence of reentry. Copying is not the destination. It is engineering school.

The Guidance Problem

A missile without accuracy is an expensive firecracker. And for Iran, achieving accuracy was harder than achieving range, because the components that make a missile precise are exactly the components that Western sanctions targeted.

Modern ballistic missiles use inertial navigation systems, essentially gyroscopes and accelerometers that track the missile's position by measuring its acceleration from launch. High-precision inertial components were on every sanctions list. UN Security Council Resolution 1929, passed in 2010, specifically targeted guidance and navigation technology exports to Iran.

Iran's response was to build its own. The process was slow and imperfect, but by October 2015, Iran unveiled the Emad, which it described as its first precision-guided ballistic missile. The Emad featured a maneuverable reentry vehicle, meaning the warhead could adjust its trajectory during the terminal phase of flight rather than simply falling along a ballistic arc. Iran claimed a CEP as low as 50 meters. Western analysts are far more skeptical: one study based on impact data from the April 2024 strike estimated the Emad variant's CEP at approximately 1.2 kilometers. The true figure likely falls somewhere between those extremes, but even the conservative estimate represents a meaningful improvement over the original Shahab-3.

The engineering logic behind Iran's approach is worth understanding. Most modern precision weapons rely on GPS corrections during flight. But GPS is an American system, and it can be selectively denied or jammed. Iran chose to combine inertial navigation with its own terminal correction systems, essentially building guidance that does not depend on any foreign satellite constellation. The result is less accurate than GPS-aided guidance, but it cannot be switched off by an adversary.

Think of it this way: if you are navigating a dark room, GPS is like someone telling you exactly where to step. Inertial navigation is like counting your own paces and remembering every turn. The second method accumulates errors over distance, but nobody can take it away from you.

Solid Fuel Changes the Game

While accuracy grabbed headlines, Iran was quietly solving a different problem that may matter even more strategically: switching from liquid to solid fuel.

Why does fuel type matter? Liquid-fueled missiles must be fueled shortly before launch. The propellants are corrosive and toxic, requiring specialized handling. The fueling process takes hours and is visible to surveillance satellites. A missile sitting on a launch pad being fueled is a missile inviting a preemptive strike.

Solid-fuel missiles change the equation entirely. The propellant is pre-loaded and chemically stable. A solid-fuel missile can sit in a sealed canister on the back of a truck for years, then launch within minutes of receiving the order. No fueling crews, no visible preparation, no window for preemption.

Iran's solid-fuel program started small, with the Fateh-110 family in the early 2000s, a short-range system reaching about 300 kilometers. The family grew. The Zolfaghar, unveiled in 2016, extended range to roughly 700 kilometers. The Dezful, displayed in February 2019, pushed it to about 1,000 kilometers.

The landmark came in November 2008, when Iran tested the Sejjil, a two-stage solid-fuel medium-range ballistic missile with an estimated range of approximately 2,000 kilometers. The Sejjil demonstrated that Iran could produce large solid-fuel rocket motors domestically, a capability that only a handful of countries possess.

The physics involves a trade-off. Liquid fuel delivers more energy per kilogram, a measure engineers call specific impulse. Solid fuel is less efficient but always ready. For a country that watched the United States destroy Saddam Hussein's military infrastructure in 1991 and again in 2003, "always ready" beats "slightly more powerful" every time. Iran's entire strategic posture rests on the assumption that its launch sites will be targeted. Solid fuel means the missiles leave before the bombers arrive.

The Khorramshahr Question

Not everything in Iran's arsenal went solid. The Khorramshahr, first displayed at a military parade in September 2017, uses liquid fuel and carries a warhead of up to 1,800 kilograms over a range of 2,000 kilometers. The family has since expanded: the Khorramshahr-4, also known as the Kheibar, was unveiled in May 2023 with improved guidance and a lighter warhead. A separate solid-fueled system called the Kheibar Shekan, sometimes confused with the Khorramshahr-4, appeared in February 2022 with a range of about 1,450 kilometers.

Western intelligence agencies believe the original Khorramshahr descends from the North Korean Musudan, also known as the BM-25, which itself traces back to the Soviet R-27 Zyb, a submarine-launched ballistic missile from the Cold War era. The technology transfer chain runs from Soviet submarine yards - where North Korea recruited Makeyev Design Bureau engineers after the Soviet collapse - through North Korean workshops to Iranian desert launch pads, a lineage that spans half a century and three political systems.

But the Khorramshahr raises an uncomfortable question that has less to do with engineering and more to do with intent. Why does Iran need a missile that carries 1,800 kilograms to a target 2,000 kilometers away?

Conventional high-explosive warheads at that weight are somewhat inefficient for a ballistic missile. The destructive radius is modest relative to the cost and complexity of the delivery system. There are cheaper ways to deliver 1,800 kilograms of explosives to a target. Where a heavy warhead on a ballistic missile makes strategic sense is when the warhead is not conventional.

Iran insists its missile program is entirely conventional. Western governments and the IAEA note that an 1,800-kilogram payload capacity aligns with early-generation nuclear warhead weights. This concern is precisely why the Khorramshahr specifically triggered additional sanctions attention. The facts are on the table. The interpretation depends on who you ask.

Fattah: Hypersonic or Hype?

In June 2023, Iran unveiled the Fattah with a flourish of propaganda: a hypersonic missile, they said, capable of Mach 13 to 15 and a range of 1,400 kilometers. State television showed animated graphics of the weapon evading missile defenses. The Fattah-2, displayed later that year, reportedly featured a hypersonic glide vehicle warhead. Iran claimed the Fattah was used in the April 2024 strike on Israel.

The problem is that the word "hypersonic" has become one of the most abused terms in modern defense commentary. Here is why.

Every ballistic missile reentering the atmosphere reaches hypersonic speeds. A Shahab-3 from the 1990s hits Mach 7 or more during reentry. That is basic physics, not a technological breakthrough. Calling a ballistic missile "hypersonic" because it is fast during reentry is like calling every car "supersonic" because it once rolled downhill quickly.

What makes a weapon a genuine hypersonic threat is not raw speed but the ability to maneuver at hypersonic velocities within the atmosphere. A true hypersonic glide vehicle, or HGV, reenters the atmosphere and then glides at Mach 5 or above while executing unpredictable course changes. This combination of speed and maneuverability is what defeats missile defenses, because the interceptor cannot predict where the target will be.

As of early 2026, only Russia, China, and the United States have demonstrated operationally deployed hypersonic glide vehicles - Russia's Avangard, China's DF-ZF, and the US Army's Dark Eagle, which completed its first end-to-end flight test in December 2024. North Korea has claimed HGV tests but without independent verification. Whether Iran's Fattah represents a genuine HGV or a ballistic reentry vehicle with modest maneuvering capability remains an open question. Independent verification of its performance during the April 2024 strike is limited, and several defense analysts have described Iran's hypersonic claims as dubious.

Iran has strong incentives to overclaim. Announcing a hypersonic capability serves deterrence even if the weapon does not fully deliver on the claim. Western analysts remain cautious, noting that developing a true HGV requires sustained testing and materials science that Iran has not publicly demonstrated. The honest assessment: Iran is working on it, may have achieved partial capability, and is certainly closer than it was five years ago. But the gap between Iran's publicity and proven performance remains significant.

Building Under Sanctions

The missiles described above were developed while Iran faced some of the most comprehensive sanctions ever imposed on a nation's military-industrial sector. UN Security Council Resolution 1737 in 2006 first specifically targeted missile-related activities. UNSCR 2231 in 2015, the resolution underpinning the JCPOA nuclear deal, replaced earlier measures but maintained restrictions on ballistic missile work. When the United States withdrew from the JCPOA in 2018, American secondary sanctions became the primary constraint, penalizing any foreign company that supplied Iran's defense sector.

The effect was paradoxical. Sanctions unquestionably slowed Iran's progress. Systems that might have been developed in five years took fifteen. But the sanctions also forced Iran to build domestic production capabilities for carbon fiber composites, specialized alloys, and guidance electronics that it would otherwise have simply purchased abroad. The result, decades later, is a supply chain that is largely indigenous and therefore harder to disrupt through further sanctions.

The missile program sits under the IRGC Aerospace Force, not the regular military. Iran's overall defense budget is difficult to pin down - SIPRI estimates roughly $8 billion based on official figures, while analyses that include IRGC expenditures and off-budget funding streams suggest figures between $17 and $23 billion. By any measure, Iran spends far less on defense than its Gulf rival Saudi Arabia, which allocated $78 billion for 2025. But Iran channels a disproportionate share of its budget toward missile development because missiles are its primary deterrent. Iran has no modern air force to speak of. Its navy cannot project power beyond the Persian Gulf. Missiles are the one domain where Iran can threaten adversaries at strategic distance.

This is the sanctions paradox that Western policymakers confront repeatedly: sanctions that are severe enough to cause pain but not severe enough to stop a program may end up creating a more resilient adversary. Iran's missile program is a case study in that dynamic.

What the Arsenal Actually Looks Like Today

Strip away the propaganda and the threat inflation. What does Iran actually have?

The best available estimates, drawn from the International Institute for Strategic Studies, the Center for Strategic and International Studies, and Congressional Research Service reports, suggest Iran possesses several hundred ballistic missiles. The total arsenal, including shorter-range tactical rockets, numbers in the low thousands.

The inventory spans multiple families: the liquid-fueled Shahab-3, Emad, and Ghadr variants with ranges of 1,300 to 1,900 kilometers; the solid-fueled Sejjil at approximately 2,000 kilometers; the liquid-fueled Khorramshahr family at 2,000 kilometers; the solid-fueled Fateh, Zolfaghar, and Dezful series from 300 to 1,000 kilometers; and the claimed Fattah hypersonic system at 1,400 kilometers.

None of these can reach Western Europe or the continental United States. Iran's maximum demonstrated range is approximately 2,000 kilometers. But every state in the Middle East lies within that radius. Israel, Saudi Arabia, Turkey, and American military bases across the Gulf are all targetable.

Iran has invested heavily in survivability. Hardened underground missile bases, reportedly tunneled into mountainsides, protect the arsenal against air strikes. Mobile launchers allow missiles to be dispersed across the country's vast territory. The lesson Iran absorbed from watching the United States systematically destroy Iraq's fixed military infrastructure in two wars was simple: anything with a known address gets destroyed. So Iran gave its missiles no fixed address.

The April 2024 attack on Israel offered the first large-scale test of this arsenal in combat. Iran launched over 300 projectiles - approximately 170 drones, more than 120 ballistic missiles, and over 30 cruise missiles. Israel, supported by the United States, the United Kingdom, France, and Jordan, intercepted the vast majority. Israel claimed a 99 percent interception rate. But "vast majority" is not "all." A US official confirmed that five ballistic missiles struck Nevatim airbase, damaging a C-130 transport aircraft and an unused runway.

Propaganda vs. Proven Capability

The March 2026 strike near Dimona provides the most recent data point. A missile landed in the vicinity of one of Israel's most sensitive installations. Whether it was aimed specifically at Dimona or at the broader Negev area remains debated. But the fact that it arrived at all demonstrates that Iran's ballistic missiles can reach their intended geographic region and that not every missile is intercepted.

Iran's demonstrated capability falls in a space between two narratives. Tehran's version claims precision strikes against any target at will. Western dismissals frame the arsenal as primitive and easily countered. Neither is accurate.

The reality is more nuanced and, in some ways, more concerning than either extreme. Iran cannot reliably hit a specific building with a ballistic missile. But it can saturate a region with enough projectiles that some will get through even sophisticated defenses. It can threaten any country within 2,000 kilometers with damage that, while not surgically precise, is militarily and psychologically significant. And the trend line moves in one direction. Every generation of Iranian missiles is more accurate, more survivable, and harder to intercept than the last.

Four decades ago, Iran could not even respond to Iraqi Scuds. Today it possesses the Middle East's largest missile arsenal, with solid-fuel weapons that can launch in minutes and guidance systems built entirely at home. The engineering story is one of relentless incremental progress under extraordinary constraints. What the next generation looks like, and whether the Fattah's hypersonic claims become proven reality, will determine whether Iran's missile program remains a regional threat or becomes something the rest of the world needs to reckon with.