War dialing

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War dialing or wardialing is a technique that uses a modem to automatically scan a list of phone numbers, usually by calling each local number to look for computers, BBS services, or faxes. Hackers used the information they acquired for various purposes.

The caller was dialing an unknown number usually waiting for two rings, because other computers connected to the telephone network usually received an instant call. If the phone rings twice, the computer interrupts the test and selects the next number, just as if it was answered by a human or an answering machine. On the other hand, if a computer with a modem or fax was answered, the number was added to the list. Depending on the time of the day, an attempt to check the 10,000 numbers could upset dozens or hundreds of people who either did not answer the call or simply received it to hear the caller's disconnect on the other side.

The name of this technique was taken from the movie War Games of 1983, where the main character programmed his home computer to scan all phone numbers in Sunyvalle, California, looking for computer systems connected to the telephone line. Shortly after, the respective programs started appearing on the BBS.

Wardriving - a popular online scanning technology for wireless networks, especially unprotected, has its name in wardialing.

wiki

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