This usually does the trick for me: 

my $address = $ENV{X_FORWARDED_FOR} || $ENV{REMOTE_ADDR} || "";

[download]

This returns an IP or a zero length string, which tends to be accurate enough for use as a factor in authentication. You can not be assured that the values provided by the web server environment variables are not spoofed, so multi-factoring of your incoming information is useful.

In reply to Re: Retrieving the REMOTE HOST by snopal
in thread Retrieving the REMOTE HOST by Anonymous Monk

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