IP address:

GetRTTAndHopCount

IpReleaseAddress

Displaying all TCP connections for the local system

Enumerating network interfaces on the local computer

How to build UDP responder

How to create non-blocking Winsock server

How to ping a remote site using IP Helper API calls

How to release and renew a lease on an IP address previously obtained through Dynamic Host Configuration Protocol (DHCP)

How to retrieve adapter information for the local computer (including MAC address)

Obtaining addresses for the adapters on the local computer (Win XP/2003/Vista)

Retrieving the interface–to–IP address mapping table

Retrieving the User Datagram Protocol (UDP) listener table

Using named pipes for interprocess communication

Winsock: retrieving the standard host name and IP address for the local machine

Winsock: sending email messages (SMTP, port 25)