Search for a tool
DTMF Code

Tool to decrypt/encrypt DTMF codes. Dual-tone multi-frequency DTMF codes are combinations of sound frequencies used in phones when dialing numbers.

Results

DTMF Code -

Tag(s) : Telecom, Substitution Cipher

Share
Share
dCode and more

dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!
A suggestion ? a feedback ? a bug ? an idea ? Write to dCode!


Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!


Feedback and suggestions are welcome so that dCode offers the best 'DTMF Code' tool for free! Thank you!

DTMF Code

DTMF Frequencies Decoder

 

DTMF Frequencies Encoder

 


See also: Morse Code

Answers to Questions (FAQ)

What are DTMF Codes? (Definition)

A DTMF code for dual-tone multi-frequency, is the name given to a combination of sound frequencies (beep) emitted by the keys of a telephone keypad.

The sounds emitted can be used by telephone servers, either to recognize a dialed number, or by automated voice servers to recognize which keys are typed by the user.

How to encrypt a number using DTMF Codes?

DTMF codes are used by phones and can be used to substitute numbers with their sound wave frequency as described in the table:

1209 Hz1336 Hz1477 Hz1633 Hz
697 Hz123A
770 Hz456B
852 Hz789C
941 Hz*0#D

Example: To crypt DC0D3, look for D which is the combination of 941Hz and 1633Hz, then write it 1633-941 (or 941-1633). The complete ciphered message is 1633-941/1633-852/1336-941/1633-941/1477-697

How to decrypt Codes DTMF cipher?

Decryption is a simple reverse substitution, for each frequency, a digit or a letter is associated.

The site here allows to decrypt directly from an audio file.

Often, the digital codes obtained can themselves be coded in T9 or Multi-tap.

How to recognize DTMF Codes?

There are only 8 frequencies: 697 Hz, 770 Hz, 852 Hz, 941 Hz, 1209 Hz, 1336 Hz, 1477 Hz and 1633 Hz.

What does DTMF means?

DTMF stands for dual-tone multi-frequency and translates sometimes into Vocal Frequencies.

Source code

dCode retains ownership of the "DTMF Code" source code. Except explicit open source licence (indicated Creative Commons / free), the "DTMF Code" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "DTMF Code" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "DTMF Code" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
Reminder : dCode is free to use.

Cite dCode

The copy-paste of the page "DTMF Code" or any of its results, is allowed (even for commercial purposes) as long as you credit dCode!
Exporting results as a .csv or .txt file is free by clicking on the export icon
Cite as source (bibliography):
DTMF Code on dCode.fr [online website], retrieved on 2024-06-14, https://www.dcode.fr/dtmf-code

Need Help ?

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

Questions / Comments

Feedback and suggestions are welcome so that dCode offers the best 'DTMF Code' tool for free! Thank you!


https://www.dcode.fr/dtmf-code
© 2024 dCode — El 'kit de herramientas' definitivo para resolver todos los juegos/acertijos/geocaching/CTF.
 
Feedback