Finding a service name, given the port and protocol

#!/usr/bin/env python

import socket

def find_service_name():
	protocolname = 'tcp'
	for port in [80,25]:
		print "Port:%s => service name: %s" %(port,socket.getservbyport(port,protocolname))
	print "Port:%s => service.name:%s"%(53,socket.getservbyport(53,'udp'))

if __name__ == '__main__':
	find_service_name()
	

TEST:

Port:80 => service name: http
Port:25 => service name: smtp
Port:53 => service.name:domain
[Finished in 0.1s]