Mysterious Number Stations Return Amidst US-Israel-Iran Conflict

A cryptic shortwave radio broadcast featuring strings of numbers in Persian has resurfaced, coinciding with the recent US-Israel attacks on Iran. The broadcast, reminiscent of Cold War-era “number stations,” is raising questions about its purpose and intended recipient.

The Broadcast and Its Origins

The transmission, which begins with the announcement “Tavajoh! Tavajoh! Tavajoh!” (Attention! Attention! Attention!) in Persian, consists of rhythmic sequences of numbers, occasionally interspersed with English words. According to Priyaman organization, which monitors global military and intelligence use of shortwave radio, the broadcast began as the US bombing of Iran commenced on February 28, 2026.

The signal initially aired on the 7910 kHz shortwave frequency at 02.00 UTC, and 18.00 UTC daily. After attempts to jam the frequency, the transmission shifted to 7842 kHz. Using multilateration and triangulation techniques, Priyaman traced the signal’s origin to a US military base in Böblingen, southwest of Stuttgart, Germany, specifically within a restricted training area near Panzer Kaserne and Patch Barracks, potentially linked to the US army’s 52nd Strategic Signal Battalion.

What are Number Stations?

Number stations are shortwave radio broadcasts that transmit coded messages, typically strings of numbers or seemingly random codes. Historian Maris Goldmanis, a researcher of number stations, explains that these stations are “encrypted radio messages used by foreign intelligence services, often as part of a complex operation by intelligence agencies and militaries.”

While their use dates back to World War I, number stations gained prominence during the Cold War as a means for governments to communicate with agents discreetly. Former US intelligence officer John Sipher, who served 28 years in the CIA’s National Clandestine Service, notes that these stations provided a way to communicate with assets “without being noticed,” particularly when in-person communication was impossible due to political constraints or conflict.

The messages themselves are unintelligible without a corresponding codebook, which provides the key to decrypting the coded information. Sipher emphasizes that these systems require pre-established coordination and a shared codebook between the sender and recipient.

Purpose and Implications

The purpose of the current broadcast and its intended recipient remain unknown. The encrypted nature of the transmission and its structured schedule suggest a deliberate and planned operation. Goldmanis suggests that the details may remain unclear for years.

While modern communication technologies like satellites and encrypted systems are now prevalent, number stations represent a throwback to a time when covert communication required more analog methods. The re-emergence of this technique amidst heightened geopolitical tensions raises questions about its role in current intelligence operations.

Key Takeaways

• A mysterious number station broadcast has resumed operations, coinciding with the US-Israel attacks on Iran.
• The signal originates from a US military base in Germany.
• Number stations are a Cold War-era method of covert communication used by intelligence agencies.
• The purpose of the current broadcast and its intended recipient are currently unknown.