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                  | Title | Make a field for the user to enter an IP address | 
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 | Keywords | IP address, masked field, validation | 
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 | Categories | Software Engineering | 
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 |  | By Erik Spaans. 
This program builds an input box that lets the user enter an IP address of the form
123.123.123.123. The subfields are numbers between 0 and 255.
See the code for details.
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