NETSTAT.exe

Display current TCP/IP network connections and protocol statistics.

syntax
   NETSTAT [options] [-p protocol] [interval]

key
   -a           Display all connections and listening ports.
   -e           Display Ethernet statistics. (may be combined with -s)
   -n           Display addresses and port numbers in numerical form.
   -r           Display the routing table.

   -o           Display the owning process ID associated with each connection.
                (XP only)

   -p protocol  Show only connections for the protocol specified; 
                may be either: TCP or UDP.
                Windows 2K/XP also allow: TCPv6 or UDPv6.  
                If used with the -s option then the following protocols
                may also be specified: IP, IPv6, ICMP,or ICMPv6.

   -s           Display per-protocol statistics.  By default, statistics are
                shown for IP, ICMP, TCP and UDP.
                Windows 2K/XP will also display: IPv6, ICMPv6, TCPv6 and UDPv6 
                The -p option may be used to specify a subset of the default.

   interval     Redisplay statistics, pausing interval seconds between
                each display. (default=once only) Press CTRL+C to stop. 
                

Related Commands:

Dommon.exe - GUI Domain Monitor (W2K but works with NT)
BROWSTAT - Get domain, browser and PDC info
ROUTE - Manipulate network routing tables.
PATHPING - IP trace utility
PING - Test a network connection

Equivalent Linux BASH commands:

ping - Test a network connection
trace - Find the IP address of a remote host.