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Validating an IP String in C#

/ Published in: C#
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Quick method to validate a string is a valid IP address.

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  1. /// <summary>
  2.         /// Check IP Address, will accept 0.0.0.0 as a valid IP
  3.         /// </summary>
  4.         /// <param name="strIP"></param>
  5.         /// <returns></returns>
  6.         public Boolean CheckIPValid(String strIP)
  7.         {
  8.             //  Split string by ".", check that array length is 3
  9.             char chrFullStop = '.';
  10.             string[] arrOctets = strIP.Split(chrFullStop);
  11.             if (arrOctets.Length != 4)
  12.             {
  13.                 return false;
  14.             }
  15.             //  Check each substring checking that the int value is less than 255 and that is char[] length is !> 2
  16.             Int16 MAXVALUE = 255;
  17.             Int32 temp; // Parse returns Int32
  18.             foreach (String strOctet in arrOctets)
  19.             {
  20.                 if (strOctet.Length > 3)
  21.                 {
  22.                     return false;
  23.                 }
  24.  
  25.                 temp = int.Parse(strOctet);
  26.                 if (temp > MAXVALUE)
  27.                 {
  28.                     return false;
  29.                 }
  30.             }
  31.             return true;
  32.         }

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