ToneLoc was a popular war dialing computer program for MS-DOS written in the early to mid-1990s by two programmers known by the pseudonyms Minor Threat (Chris Lamprecht) and Mucho Maas. The name ToneLoc was short for "Tone Locator" and was a word play on the name of the rap artist known as Tone Lōc.
ToneLoc took advantage of the extended return codes available on US Robotics modems (e.g., ATX6 ) to detect dial tones upon dialing a number and to detect when a human answered the phone in addition to scanning for other modems. Detection of voice numbers sped up the scanning process by disconnecting upon detecting a human instead of timing out waiting for a modem carrier signal. The detection of a dial tone after dialing a number allowed for users to search for poorly secured extenders which could be used to divert calls through.
On April 17, 2005, the source code for ToneLoc was released.
- ToneLoc v1.10 source code
- ToneLoc v0.98 User Manual
- Interview with Minor Threat, ToneLoc's author, part of BBS: The Documentary
- "5637 58K Users' Guide". 3COM. Retrieved 10 January 2013.
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