Khorramshahr-4

Reference data current as of March 2026.

The Khorramshahr-4 carries the heaviest warhead in Iran's MRBM inventory — a full 1,000 kg payload — combined with a 2,000 km range that places the entirety of Israel and US bases across the Gulf well within reach. It is a fourth-generation evolution of the Khorramshahr family, which traces its lineage through the Shahab-3 to BM-25 Musudan technology. The IRGC has claimed it is MIRV-capable (multiple independently targetable reentry vehicles), though this claim has not been independently verified. As a liquid-fuel system, it requires extended fuelling time before launch, making it more vulnerable to pre-emptive strike than Iran's solid-fuel alternatives.

• Heaviest warhead (1 ton) in the Iranian MRBM inventory
• MIRV-capable — claimed by IRGC as 4th-generation capability, unverified by Western analysts
• Longest-range liquid-fuel MRBM in active Iranian service (2,000 km)
• Shahab-3/BM-25 Musudan lineage with MaRV terminal corrections
• GNSS-aided INS for midcourse correction

The Khorramshahr-4 saw its first confirmed combat use on 5 March 2026 during True Promise 4 (Wave 19). Its deployment represented a significant escalation — the 1-ton warhead is designed for maximum destructive effect against hardened targets. The decision to employ Khorramshahr-4 in TP4 signalled Iran's willingness to bring its heaviest conventional weapons into the conflict.

• CSIS Missile Threat — Khorramshahr
• Wikipedia — Khorramshahr (missile)