CODEWITHSUNDEEP
c#ip
user319854
user319854

Reputation: 4106

compare two ip with C#

How I can compare two IP address?

string ip1 = "123.123.123.123";
string ip2 = "124.124.124.124";

I need some like this:

if(ip1 == ip2)
{
   //true
}

Upvotes: 15

Views: 22483

Answers (6)

Longball27
Longball27

Reputation: 696

Check out Equals method on System.Net.IPAddress

Upvotes: 5

Nolmë Informatique
Nolmë Informatique

Reputation: 686

You can use this class to compare IpAddress :

http://www.codeproject.com/Articles/26550/Extending-the-IPAddress-object-to-allow-relative-c

Upvotes: 1

Kamran Khan
Kamran Khan

Reputation: 9986

IPAddress addr1 = IPAddress.Parse(ip1);
IPAddress addr2 = IPAddress.Parse(ip2);

return (addr1.Equals(addr2));

Upvotes: 3

JaredPar
JaredPar

Reputation: 754715

The type IPAddress in the BCL supports equality and can be used for this purpose.

public static bool IsSameIPAddress(string ip1, string ip2) {
  IPAddress leftIP = IPAddress.Parse(ip1);
  IPAddress rightIP = IPAddress.Parse(ip2);
  return leftIP.Equals(rightIP);
}

Several people have wondered why a straight string comparison is not sufficient. The reason why is that an IP address can be legally represented in both base 10 and hexidecimal notation. So the same IP address can have more than 1 string representation.

For example

var left = "0x5.0x5.0x5.0x5";
var right = "5.5.5.5";
IsSameIPAddress(left,right); // true
left == right; // false

Upvotes: 20

Eric Mickelsen
Eric Mickelsen

Reputation: 10377

The IPAddress class (System.Net) has an overridden Equals method that will compare the addresses, not the object instances, which is what you want. String comparison here may be dangerous since it is possible for IP addresses to have more than one string representation. http://msdn.microsoft.com/en-us/library/system.net.ipaddress.equals%28v=VS.71%29.aspx

IPAddress.Parse(ip1).Equals(IPAddress.Parse(ip2))

Upvotes: 2

Lee
Lee

Reputation: 144136

It seems System.Net.IPAddress defines it's own Equals override so this should work:

IPAddress ip1 = IPAddress.Parse("123.123.123.123");
IPAddress ip2 = IPAddress.Parse("124.124.124.124");

if(ip1.Equals(ip2))
{
    //...
}

Upvotes: 39

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