Tuesday, 11 March 2014

List Open TCP Ports in Command Prompt

Description:

In this article, I am going to explain how to find all Open or Listening Ports in Local Computer using Command Prompt command. You can easily find by using "netstat" command line utility.

Find and List open, closing, established and listening ports in Command Prompt:
C:\>netstat -a
Find Open Ports in command prompt

CMD command to find and list only listening ports:
netstat -an |find /i "listening"
Get Open tcp Port in command prompt


Get open/established ports in Command Prompt:
netstat -an |find /i "established"
List Opened TCP Ports in command prompt

NETSTAT Command Line Utility Usage:
This command prompt utility is used to display protocol statistics and current TCP/IP network connections.
NETSTAT [-a] [-b] [-e] [-f] [-n] [-o] [-p proto] [-r] [-s] [-t] [interval]

  -a            Displays all opened connections and listening ports.

  -b            Displays the executable involved in creating each connection or
                listening port. In some cases well-known executables host
                multiple independent components, and in these cases the
                sequence of components involved in creating the connection
                or listening port is displayed. In this case the executable
                name is in [] at the bottom, on top is the component it called,
                and so forth until TCP/IP was reached. Note that this option
                can be time-consuming and will fail unless you have sufficient
                permissions.

  -e            Displays Ethernet statistics. This may be combined with the -s
                option.

  -f            Displays Fully Qualified Domain Names (FQDN) for foreign
                addresses.

  -n            Displays addresses and port numbers in numerical form.

  -o            Displays the owning process ID associated with each connection.

  -p proto      Shows connections for the protocol specified by proto; proto
                may be any of: TCP, UDP, TCPv6, or UDPv6.  If used with the -s
                option to display per-protocol statistics, proto may be any of:
                IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, or UDPv6.

  -r            Displays the routing table.

  -s            Displays per-protocol statistics.  By default, statistics are
                shown for IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, and UDPv6;
                the -p option may be used to specify a subset of the default.

  -t            Displays the current connection offload state.

  interval      Redisplays selected statistics, pausing interval seconds
                between each display.  Press CTRL+C to stop redisplaying
                statistics.  If omitted, netstat will print the current
                configuration information once.




Thanks,
Morgan
Software Developer

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