function gethostbyaddr("1.2.3.4") returns the name of the computer at IP address 1.2.3.4. If the computer has
no name, it returns the IP address unchanged. What the function returns when given an invalid IP address
is not documented. On this server, it returns nothing. Some real live examples:
The computer at 216.92.35.29 is =>computergripes.com<=
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