Escaneo de rango de puertos con Nmap en linux

 http://www.encuentroalternativo.com/escaneo-de-rango-de-puertos-con-nmap/

[root@maquina:~]nmap -p 1-5000 localhost
 
Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2010-05-31 07:58 CDT
Interesting ports on localhost.localdomain (127.0.0.1):
Not shown: 4998 closed ports
PORT     STATE SERVICE
80/tcp   open  http
3306/tcp open  mysql
 
Nmap finished: 1 IP address (1 host up) scanned in 0.238 seconds