The self-imposed limit on missile range has been effectively lifted, with IRGC spokesman Brigadier General Hossein Mohebbi in a recent interview announcing that the restrictions no longer hold.
However, he hastened to add that “the ability should be put into action instead of merely talking about it.”
The announcement raises a technical question that requires a technical response: What would it take for an Iranian ballistic missile to travel significantly beyond 2,000 kilometres, and what technologies does Iran have at its disposal to achieve that?
The announcement came days after the Leader of the Islamic Revolution, Ayatollah Seyyed Mojtaba Khamenei, instructed military commanders to respond immediately and decisively to any new act of aggression, regardless of where it originates.
Iranian officials have long described the 2,000-kilometre range as a self-imposed limit rather than a technological constraint.
In 2017, senior Iranian military commanders publicly stated that Iran had deliberately capped its missile range as a matter of policy.
Foreign Minister Abbas Araghchi recently reiterated that Iran possesses the capability to develop longer-range missiles but had chosen not to exercise it, as doing so could lead other countries to perceive Iran as a threat.
This distinction is crucial to framing the technical analysis. A restriction imposed by policy can also be lifted through a policy decision. What follows is a reconstruction of the technological landscape made available to Iranian missile engineers under the new circumstances and new instructions from the Leader.
No Iranian missile has been publicly demonstrated flying beyond the previous range limit, and Tehran has yet to disclose any specific programme or technical roadmap for developing such a capability.
A policy ceiling, not a technical one
Iran’s existing missile arsenal already gives it substantial reach across the region. Its short-range systems include missiles in the 200–300-kilometre class, such as the Fateh-110 family.
The Zolfaghar and Dezful, meanwhile, are estimated to have ranges of approximately 700 and 1,000 kilometres, respectively. Both represent important extensions of Iran’s solid-fuel missile capabilities.
The country’s publicly unveiled arsenal also includes the Khorramshahr-4, a liquid-fuel ballistic missile with a declared range of 2,000 kilometres, alongside the Sejjil and other members of the Khorramshahr family.
At present, a 2,000-kilometre range places the entire Arabian Peninsula, the Levant, much of Egypt and parts of Greece and the Balkans within reach of Iranian missiles.
Extending that range, therefore, is not primarily about gaining access to the region, which Iran can already reach. Rather, it is about extending its strike capability into more distant theatres.
This is the broader significance of the Leader’s call for a response to aggression “without geographical limitations.”
The physics of range
At the heart of ballistic missile performance is the ability to accelerate a payload to a specified velocity and launch it along a particular trajectory. Once the missile’s powered flight ends, its subsequent trajectory is governed primarily by gravity and its initial velocity.
In a simplified ballistic model, the range depends principally on the velocity and flight-path angle at the end of powered flight, commonly referred to as burnout.
Under idealised conditions, range is approximately proportional to the square of the burnout velocity. At longer distances, additional factors, including Earth’s curvature and rotation, must also be taken into account.
The underlying principle, however, remains unchanged: even a relatively modest increase in burnout velocity can produce a disproportionately large increase in range.
The rocket equation provides the theoretical framework for understanding how a missile achieves the required velocity. In broad terms, the attainable velocity increases with the efficiency of the propellant, commonly expressed as specific impulse, and with the ratio of the missile’s initial mass to its final mass after propellant depletion.
Consequently, many of the engineering choices involved in missile design are directed towards improving propulsion efficiency, increasing the proportion of the vehicle’s mass available for propellant, or reducing the mass that must be accelerated.
One of the fundamental trade-offs in ballistic missile design is therefore the relationship between payload and range. A heavier payload generally reduces the distance a missile can travel, while a lighter payload can extend its range, assuming other design parameters remain unchanged.
This trade-off is central to understanding the engineering constraints involved in extending a missile’s operational reach.
Four levers available to engineers
An analysis of long-range missile development points to four broad technological pathways for extending range. None requires particularly exotic technology, and Iran has experience in all four areas:
Propulsion: Iran has developed both solid-propellant systems, such as the Sejjil, and liquid-propellant systems, including the Khorramshahr family.
Solid-fuel motors offer advantages in readiness, storage and operational simplicity, while liquid-fuel engines can offer greater propulsion efficiency and more flexible thrust control.
Improvements in propellant energy, combustion efficiency and nozzle performance can all contribute to higher burnout velocity.
The IRGC Aerospace Force has also stated that it manufactured missiles and drones using domestic resources during the current war, pointing to an established indigenous propulsion and manufacturing base.
Structural mass: With the amount of propellant held constant, reducing the missile’s structural weight can improve its mass ratio and overall performance.
This involves reducing the weight of the airframe, propellant tanks and motor casings without compromising structural integrity.
Advances in composite materials, lighter structural components and more efficient casing designs are among the established approaches to reducing mass.
These considerations have become increasingly important as Iran develops successive generations of missile systems.
Staging and payload design: Multistage architecture is a well-established feature of long-range ballistic missiles. By separating successive stages after their propellant has been expended, a missile can shed dead weight and improve its overall performance.
Separating the warhead from the main missile body can also reduce the mass that must be carried through the later stages of flight. Iran already has experience with both approaches: the Sejjil is a two-stage missile, while several Iranian systems incorporate separating warheads.
Trajectory and guidance: A missile’s range and flight characteristics are also influenced by its trajectory. Different flight profiles involve trade-offs between maximum distance, flight time, re-entry angle and other operational considerations.
Advances in inertial navigation and satellite-aided guidance have expanded the ability to maintain accuracy across different flight profiles. These technologies are an established part of modern missile development and are areas in which Iran has accumulated considerable experience.
The launch pad used for space vehicles
There is perhaps no stronger indication of the engineering foundations for a potential extension of Iran’s missile range than the country’s ability to develop space launch vehicles and place satellites into orbit.
Vehicles such as Simorgh, Qased, Qaem-100 and Zuljanah employ multistage architectures and require sophisticated capabilities in stage separation, upper-stage ignition, guidance and control, and precise orbital insertion. These are important engineering disciplines that also underpin the development of long-range ballistic missile systems.
US authorities have previously assessed that Iran possesses access to technologies that could contribute to the development of an intercontinental ballistic missile (ICBM).
Tehran, however, has rejected suggestions that its space programme serves as a cover for missile development. Iranian officials and rocket specialists have also emphasised that a space launch vehicle is not the same as a ballistic missile.
Although the two share significant technological foundations, they have one fundamental difference: a space launch vehicle is designed to place a payload into orbit, whereas a ballistic missile must deliver its payload back through the atmosphere to a target.
The more difficult challenge: Getting back down
Accelerating a payload to high velocity is only half the challenge. The payload must also survive atmospheric re-entry and reach its intended destination.
As ballistic range increases, re-entry conditions can become considerably more demanding, placing greater stress on the vehicle’s thermal protection, structural integrity and guidance and control systems.
The re-entry vehicle must withstand intense aerodynamic heating and substantial mechanical loads while maintaining the stability and accuracy required to reach its target.
Depending on the design, this may involve specialised heat-shield materials, structural reinforcement and advanced guidance systems. Some modern concepts also incorporate manoeuvrable re-entry vehicles or hypersonic glide capabilities.
This is where the distinction between placing a rocket into orbit and developing a genuinely effective long-range ballistic missile becomes particularly important.
A space launch vehicle may demonstrate propulsion, staging and orbital insertion capabilities, but these achievements alone do not establish the ability to deliver a warhead across intercontinental distances. The latter requires a separate and considerably more demanding set of re-entry technologies.
In recent years, Iranian officials have discussed manoeuvrable re-entry vehicles and hypersonic systems, including the Fattah missile family.
These developments indicate that Iran has been exploring technologies relevant to advanced flight and re-entry profiles, although public claims about their performance should be distinguished from independently verified demonstrations.
Industry and survivability
Beyond the engineering of individual missiles, there is a broader industrial dimension to the question of extending range.
Developing sophisticated propulsion systems requires an established manufacturing infrastructure capable of producing propellants, processing materials, manufacturing motor casings and maintaining consistent quality across production cycles.
These requirements become particularly significant when dealing with large solid-propellant motors and more complex missile architectures.
Iran’s expanding network of underground industrial complexes is also relevant in this context. Designed to sustain missile production and protect critical infrastructure during wartime, these facilities are intended to give the IRGC Aerospace Force greater manufacturing continuity and resilience.
The ability to manufacture, test, maintain and store increasingly sophisticated missile systems is an important part of any effort to expand operational capabilities. Industrial capacity and survivability can be as consequential as individual technological improvements.
Ultimately, whether removing the self-imposed range restriction translates into a demonstrated long-range capability will depend on flight tests, particularly those establishing the reliability and performance of re-entry vehicles over extended distances.
Lifting the 2,000-kilometre restriction does not, by itself, produce an intercontinental missile or establish that Iran already possesses one. It removes a policy constraint and gives Iranian aerospace engineers greater latitude to pursue capabilities previously excluded from the country’s declared missile doctrine.
Iran already possesses several important technological foundations: solid- and liquid-propellant propulsion, experience with multistage rocket architecture through its space programme, separating-warhead technology and an increasingly resilient domestic industrial base.
Together, these provide a substantial engineering foundation for further development. The critical next milestone would be a publicly documented long-range ballistic flight demonstrating that a re-entry vehicle can survive the journey and deliver its payload under operational conditions.
As the IRGC spokesman emphasised, the question is no longer simply what Iran says it can do, but what it can demonstrate.
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