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. The utility was created for the purpose of scanning for dial tones or modem carriers in order to find PBXes, long distance carriers, or other modems.
On April 17, 2005, the source code for ToneLoc was released.