On-line numbers database

Asian Broadcasting Institute

Chris Smolinski's Spy Center

Conet Project

Cuban HM01 page + DIGTRX decoder

Der Deutsche Freiheitssender 904 (DFS 904)

Dirk Rijmenants' Number page

Don Schimmel's Radio Intrigue


HF Underground

Hugh Stegman's site

M51a FAV22

Mystery Signals of the Short Wave

Now on the radio (includes Asian numbers stations)

Numbers @

Numbers on Wikipedia

Peter's Youtube channel


Signal Intelligence Group

Surfing the Radio Waves

Telephone trips

Tomonori Izumi's BBS

Westli's V13 (New Star) pages


High Frequency Beacons

Kiev woodpecker pictures (1)

Kiev woodpecker pictures (2) Museum

Rivet XP/XPA2/F01/F06 decoder

Russian Ionospheric link

Signal Analyzer (SA)

Sozvezdie. Manufacturer of the Serdolik System

Soviet Tropospheric system

Time and

U.S. Clandestine Radio Equipment


A Cryptographic Compendium

Alan Turing home page

Bletchley Park

Bob Lord's Crypto Museum

Code Groups

Crypto Museum

Decode Systems

Enigma Museum

Foundation for German communication and related technologies

Frode Weierud's cryptography page

Jerry Proc: Crypto Machines

One-Time Pad Generators

Secret Code Breakers books

The Enigma and the bombe


AIVD - Dutch intelligence

British Foreign and Commonwealth Office

Canadian Communications Security Establishment

Central Intelligence Agency

Centro Nacional de Inteligencia (Spain)

CTIVD - Dutch Intelligence Commission

DGSE French Intelligence

Drug Enforcement Administration

Federal Bureau of Investigation

Federal Security Service (FSB)

GCHQ - UK Government Comms HQ

German Bundesamt fuer Verfassungsschutz

Gov. Communications Security Bureau

MIVD - Dutch Military Intelligence

National Reconnaissance Office

Russian Foreign Intelligence Service (SVR)

Security Intelligence Review Committee

U.N. Crime & Justice Information Network

Wikipedia List of Intelligence Agencies


898 Verbindingsbataljon RadioCie


American Foreign Policy Council

Crime Museum


Encyclopedia of Espionage, Intelligence, and Security

Eye Spy Magazine

Federation of American Scientists

Global Security

Governments on the WWW

Intelligence 101

Intelligence Tread Handbook

International Spy Museum

Library of Congress Country Studies

National Security Archive

Psy Warrior

SCD - Der SAS- und Chiffrierdienst

Secret Bases

Spylopedia - the Internet Spy encyclopedia


USS Liberty Memorial page

Virtual Library Regional Studies