A simple example of getting the Client IP address and port number in C #

Using system;
Using system. Collections. Generic;
Using system. text;
Using system. Net; // reference added for ipendpoint
Using system. net. Sockets;

Namespace getclntip
{
Class Program
{
Static void main (string [] ARGs)
{
Tcplistener = new tcplistener (9000); // The listening port number, which can be modified as needed
Tcplistener. Start ();

// Loop for listen
While (true)
{
Socket sock = tcplistener. acceptsocket ();

// Current server time
Datetime conntime = datetime. now;
Console. writeline ("the time is:" + conntime. tostring ());

System. net. IPaddress ipadd;
Int port;

// Obtain the IP address and port number of the current user.
Ipadd = (sock. remoteendpoint as ipendpoint). address;
Port = (sock. remoteendpoint as ipendpoint). port;

Console. writeline ("the Client IP:" + ipadd. tostring ());
Console. writeline ("the client port:" + port. tostring ());
}

Tcplistener. Stop ();
}
}
}

 

[Appendix] obtain the local IP Address:

// Obtain the IP address of the Local Area Network

IPaddress [] Addresslist = DNS. gethostbyname (DNS. gethostname (). Addresslist;

If (Addresslist. Length <1)

{

Retern "";

}

Retern Addresslist [0]. tostring (); // note that the array parameter here is 0

 

// Obtain the IP address dynamically allocated for dialing

Ipadress [] Addresslist = DNS. gethostbyname (DNS. gethostname (). Addresslist;

If (Addresslist. Length <2)

{

Return "";

}

Return Addresslist [1]. tostring (); // note that the array parameter here is 1