C # method to determine whether a given IP address is within a specified range

The example in this article describes how C # determines whether a given IP address is within a specified range. Share to everyone for your reference. The specific analysis is as follows:

For example, given an IP segment: 127.0.0.1 ~ 127.0.0.255, we want to determine whether a given IP address is in this section, you can first convert the IP address to an integer, and then the integer comparison size is very easy.

For example:

127.0.0.1 = 2130706433

127.0.0.255 = 2130706687

Judge:

127.0.1.253 = 2130706941

Whether the integer size is directly compared within this range can be

To convert an IP address into an integer:

public static long Ip2long (string IP) {  string[] ipbytes;  Double num = 0;  if (!string. IsNullOrEmpty (IP))  {   ipbytes = IP. Split ('. ');   for (int i = ipbytes.length-1; I >= 0; i--)   {   num + = (int. Parse (Ipbytes[i])% * MATH.POW (3-i));}  }  return (long) num;}

Determines whether a given IP address is within the specified range:

Long start = Ip2long ("127.0.0.1"), Long end = Ip2long ("127.0.0.255"), Long ipAddress = Ip2long ("127.0.1.253"); bool InRange = (ipAddress >= start && ipAddress <= end); if (inrange) {//IP Address fits within range!}

I hope this article is helpful to everyone's C # programming.

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C # method to determine whether a given IP address is within a specified range

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C # method to determine whether a given IP address is within a specified range