# always use strict & warnings
# they give useful debugging info
use strict;
use warnings;

# get your rawdata 
my @rawdata = ...

# chomp the whole array at once
chomp @rawdata;

# declare the hash
my %ipkey;

# a 'C' style for loop is useful here
# this one loops over every second array index
for (my $i = 0; $i < @rawdata; $i += 2){

    # get each pair of consecutive items from array
    my $key   = $rawdata[$_];
    my $value = $rawdata [$_ + 1];

    # then build the hash
    $ipkey{$key} = $value;	

    # and print your results
    print "Key: $key <br>Value: $value<br><br>";

    # if printing to the console, do this instead
    print "Key: $key \nValue: $value\n\n";
}