$netaddr = inet_aton($dotquad);

Convert a dot-quad IP address into an IPv4 packed network address.


inet_aton HOSTNAME

    Takes a string giving the name of a host, and translates that to t
+he 4-byte string (structure). Takes arguments of both the 'rtfm.mit.e
+du' type and '18.181.0.24'. If the host name cannot be resolved, retu
+rns undef.
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