Reference to the 1983 movieWarGames, which featured the practice. Bysurface analysis,war- +‎dial.

war-dial (third-person singular simple presentwar-dials,present participlewar-dialingorwar-dialling,simple past and past participlewar-dialedorwar-dialled)

1. To have a computer dial a large number of phone numbers in search of devices for exploitation, such asmodems orfax machines.
2. To engage in a similar activity in anotheraddress space, such asIP addresses.

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