my $hostname = gethostbyaddr(...) or "Can't resolve $data[$ip_address_pos]: $!\n";

This may not be pertinent, but I notice you use  $! in your error message. However, gethostbyaddr sez:

For the *gethost*()* functions, if the "h_errno" variable is supported in C, it will be returned to you via $? if the function call fails.
(Note $? versus $!)

Update: Actually, I can't seem to get gethostbyaddr to link usefully, so see
    perldoc -f gethostbyaddr
from your friendly local command line.

Give a man a fish:  <%-{-{-{-<

In reply to Re: Forgot variable syntax for $var = funct() or "Funct failed\n"; by AnomalousMonk
in thread Forgot variable syntax for $var = funct() or "Funct failed\n" / Any experience with is_hostname() by vlturner

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