“Oblique”
Priyom’s reception-based reference describes a female voice, USB operation and grouped messages. Its schedule varies by season; use the source for listening times.
Format, samples & schedules ↗Radio
Number stations
Coded shortwave broadcasts, documented history, reception references and listening resources.
A voice. A sequence. An unknown recipient.
Numbers stations transmit structured groups of digits or characters by voice, Morse or digital modes. Listening can reveal a broadcast’s format and schedule; it does not reveal the meaning of its encrypted traffic.
The espionage connection is documented in specific cases. In the 2009 Myers investigation, the FBI described the couple’s use of shortwave to receive Cuban intelligence messages. That evidence does not identify every station, broadcaster or recipient.
FBI case record · allegations at arrest ↗“English Man”
The monitoring reference documents male-voice USB broadcasts, repeated call-ups and message groups, with frequencies that can change by month.
Format, samples & schedules ↗The Buzzer
Often called UVB-76, this is a channel-marker network on 4,625 kHz with occasional voice traffic. Priyom classifies it separately from its numbers-station catalogue. It is not a verified public attack-warning service.
Monitoring reference ↗Listen with a reference beside you.
Start with the source recordings and current schedule. Note UTC time, frequency, mode, receiver location and reception quality. Shortwave propagation changes; a missed broadcast or a new reception is not, by itself, evidence of a geopolitical event. Station names and ENIGMA identifiers are monitoring labels, not official sender identification.
Priyom station schedule ↗ Public WebSDR receiver directory ↗
Reference directory checked 29 Oct 2026; schedules and station status may change. Summaries of monitoring observations adapted from Priyom.org under CC BY-NC-SA 4.0; these adapted summaries carry the same license. No station audio is copied or automatically played here.