Enigma ID S25

Name Russian Man "Control"
Frequencies Various (Mainly 13883)
Status Active
Voice Male, automated (the same as S06)
Emission mode USB + carrier
Location Russia
Activity pages

Download audio sample

Known counterpart stations

S25 is run by Russian Main Intelligence Directorate (GRU).

The standard a format is given below. The outro is sometimes preceded by a quintuple group repeated for several minutes.

Section #1 Section #2 Outro
049 049 049 65562 65562 049 049 049 64202 64202 00000 00000
3-figure ID 5-figure group, purpose unknown 3-figure ID 5-figure group, purpose unknown    
Repeated for 4 minutes Repeated for 4 minutes    

Typical scheduling

Nowadays S25 runs only one consistent schedule, which transmits at half hour. Both sections are sent on the same frequency, and then the transmission is repeated 10 minutes after the start of the first transmission on a different, random frequency. The transmission is also repeated two days later on the same times and frequencies.


In the 1990s S25 had a daily schedule at 08:00 UTC, for the first 20 minutes on 14890kHz, then for the remaining 20 minutes on 11270kHz. Each transmission had four sections, repeated for 10 minutes each. The ID was always 615. The ending was "615 615 615 000". In 1998, its operation was changed to weekly on Monday only, then disappeared completely in 1999.

In September 2004, the current format was introduced. S25 can have years long breaks in operation - it was unheard in 2004-2007, 2007-2012, 2012-2014, 2014-2016.

In 2017, S25 revived with a new weekly schedule and frequencies (see schedule).

Your browser is out-of-date!

Update your browser to view this website correctly. Update my browser now