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what is the command to find open ports?

Answers

  • netstat /?

     

    Displays protocol statistics and current TCP/IP network connections.

    NETSTAT [-a] [-b] [-e] [-f] [-n] [-o] [-p proto] [-r] [-s] [-t] [interval]

      -a            Displays all 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.

    • Marked as answer by Wilson Jia Thursday, May 13, 2010 6:59 AM
    Wednesday, May 12, 2010 4:09 PM

All replies

  • if you prefer visualizing through a GUI, check out sysinternals tcpview (free download)
    Wednesday, May 12, 2010 4:08 PM
  • netstat /?

     

    Displays protocol statistics and current TCP/IP network connections.

    NETSTAT [-a] [-b] [-e] [-f] [-n] [-o] [-p proto] [-r] [-s] [-t] [interval]

      -a            Displays all 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.

    • Marked as answer by Wilson Jia Thursday, May 13, 2010 6:59 AM
    Wednesday, May 12, 2010 4:09 PM