ToneLoc

ToneLoc was a popular demon dialing computer program for MS-DOS written in the early to mid-1990s by two programmers known by the pseudonyms Minor Threat and Mucho Maas. The name ToneLoc was short for "Tone Locator", and was a play on the name of the rap artist known as Tone Loc. The utility was created for the purpose of scanning for dial tones or modem carriers in order to find System 75 PBXes, long distance carriers, or other modems.

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On April 17th, 2005 the source code for ToneLoc was released.

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Demon dialing: In the cracking scene of the 1980s, demon dialing was the act of using a modem to dial every telephone number in a local area to find out where computers are available, then attempting to access them by guessing passwords....

MS-DOS: Microsoft's disk operating system, MS-DOS was the dominant operating system for the PC compatible platform during the 1980s. It has gradually been replaced on consumer desktop computers with various generations of the Windows operating system....

Pseudonym: A pseudonym (Greek: false name) is a fictitious name used by an individual as an alternative to their legal name (whereas an allonym is the name of another actual person assumed by one person in authorship of a work of art; e.g., when ghostwriting a book or play, or in parody, or when using a front ...