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/// <summary>
/// Determines whether the specified string is an IP address.
/// </summary>
/// <param name="IP">The string.</param>
/// <returns>
/// 	<c>true</c> if the specified IP is IP; otherwise, <c>false</c>.
/// </returns>
private bool IsIP(string IP)
{
    return System.Text.RegularExpressions.Regex.IsMatch(IP, @"\b((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$\b");
}