there was a couple logic errors. Here is a working version with some tests.

gistfile1.aw

<?php

class IPRange {
  private $BITS = 256;

  public function __construct($start, $end) {
    $this->start = $start;
    $this->end = $end;
  }

  public function contains($ip) {
    $total = $this->ip_as_num($ip);
    return ($this->start < $total) && ($total < $this->end);
  }

  public function ip_as_num($ip) {
    $parts = array_map("intval", array_reverse(explode('.', $ip)));
    $total = 0;
    foreach ($parts as $power => $value) {
      $total = $total + ($value * pow(256, $power));
    }
    return $total;
  }
}

class GeoIpLookup {
  private $fname = "IpToCountry.csv";
  public $db = array();
  public $country_db = array();

  public function __construct() {
    $this->load_db();
  }

  public function load_db() {
    $handle = fopen($this->fname, 'r');
    while ( !feof($handle) ) {
      $line = fgets($handle);
      if (strpos($line, '#') === false && $line) {
	$parts = explode(',', $line);
	$country = $parts[5];
	$this->db[$country][] = new IPRange(intval(substr($parts[0], 1, -1)),
					    intval(substr($parts[1], 1, -1)));
	if (!array_key_exists($country, $this->country_db)) {
	  if (isset($parts[6])) {
	    $this->country_db[$country] = $parts[6];
	  } else {
	    $this->country_db[$country] = $country;
	  }
	}
      }
    }
    fclose($handle);
  }

  public function find_country_by_ip($ip_addr) {
    foreach ($this->db as $country => $ranges) {
      foreach ($ranges as $range) {
	if ($range->contains($ip_addr)) {
	  return $this->country_db[$country];
	}
      }
    }
    return $match;
  }
}

// test range
$ip = '74.125.224.115';
$expected = 1249763443;
$range = new IPRange(1, 10);
$actual = $range->ip_as_num($ip);
if ($actual !== $expected) {
  echo "ERROR getting ip as a number\n";
  echo "$actual != $expected\n";
} else {
  $iplookup = new GeoIpLookup();
  $tests = array("google.com" => "74.125.224.114",
		 "bbc.co.uk" => "212.58.241.131");
  foreach ($tests as $domain => $ip) {
    echo $domain . " is from " . $iplookup->find_country_by_ip($ip) . "\n";
  }
}
?>