View whether some service is running on a particular port

I wanted to find out MS-SqlServer is running on which port.Although in Control panel>services ,it was showing as running but netstat dint show any trace of sqlserver

so I needed to make sure whether its running on default port 1433

to do that type (at dos prompt)
telnet localhost 1433

it will start a telnet session if some service is running on that port.