NETSTAT(8)            Linux System Administrator's Manual           NETSTAT(8)

       netstat - Print network connections, routing tables, interface
       statistics, masquerade connections, and multicast memberships

       netstat [address_family_options] [--tcp|-t] [--udp|-u] [--udplite|-U]
       [--sctp|-S] [--raw|-w] [--l2cap|-2] [--rfcomm|-f] [--listening|-l]
       [--all|-a] [--numeric|-n] [--numeric-hosts] [--numeric-ports]
       [--numeric-users] [--symbolic|-N] [--extend|-e[--extend|-e]]
       [--timers|-o] [--program|-p] [--verbose|-v] [--continuous|-c]

       netstat {--route|-r} [address_family_options]
       [--extend|-e[--extend|-e]] [--verbose|-v] [--numeric|-n]
       [--numeric-hosts] [--numeric-ports] [--numeric-users] [--continuous|-c]

       netstat {--interfaces|-i} [--all|-a] [--extend|-e[--extend|-e]]
       [--verbose|-v] [--program|-p] [--numeric|-n] [--numeric-hosts]
       [--numeric-ports] [--numeric-users] [--continuous|-c]

       netstat {--groups|-g} [--numeric|-n] [--numeric-hosts]
       [--numeric-ports] [--numeric-users] [--continuous|-c]

       netstat {--masquerade|-M} [--extend|-e] [--numeric|-n]
       [--numeric-hosts] [--numeric-ports] [--numeric-users] [--continuous|-c]

       netstat {--statistics|-s} [--tcp|-t] [--udp|-u] [--udplite|-U]
       [--sctp|-S] [--raw|-w]

       netstat {--version|-V}

       netstat {--help|-h}


       [-4|--inet] [-6|--inet6]
       [--protocol={inet,inet6,unix,ipx,ax25,netrom,ddp,bluetooth, ... } ]
       [--unix|-x] [--inet|--ip|--tcpip] [--ax25] [--x25] [--rose] [--ash]
       [--bluetooth] [--ipx] [--netrom] [--ddp|--appletalk] [--econet|--ec]

       This program is mostly obsolete.  Replacement for netstat is ss.
       Replacement for netstat -r is ip route.  Replacement for netstat -i is
       ip -s link.  Replacement for netstat -g is ip maddr.

       Netstat prints information about the Linux networking subsystem.  The
       type of information printed is controlled by the first argument, as

       By default, netstat displays a list of open sockets.  If you don't
       specify any address families, then the active sockets of all configured
       address families will be printed.

   --route, -r
       Display the kernel routing tables. See the description in route(8) for
       details.  netstat -r and route -e produce the same output.

   --groups, -g
       Display multicast group membership information for IPv4 and IPv6.

   --interfaces, -i
       Display a table of all network interfaces.

   --masquerade, -M
       Display a list of masqueraded connections.

   --statistics, -s
       Display summary statistics for each protocol.

   --verbose, -v
       Tell the user what is going on by being verbose. Especially print some
       useful information about unconfigured address families.

   --wide, -W
       Do not truncate IP addresses by using output as wide as needed. This is
       optional for now to not break existing scripts.

   --numeric, -n
       Show numerical addresses instead of trying to determine symbolic host,
       port or user names.

       shows numerical host addresses but does not affect the resolution of
       port or user names.

       shows numerical port numbers but does not affect the resolution of host
       or user names.

       shows numerical user IDs but does not affect the resolution of host or
       port names.

   --protocol=family, -A
       Specifies the address families (perhaps better described as low level
       protocols) for which connections are to be shown.  family is a comma
       (',') separated list of address family keywords like inet, inet6, unix,
       ipx, ax25, netrom, econet, ddp, and bluetooth.  This has the same
       effect as using the --inet|-4, --inet6|-6, --unix|-x, --ipx, --ax25,
       --netrom, --ddp, and --bluetooth options.

       The address family inet (Iv4) includes raw, udp, udplite and tcp
       protocol sockets.

       The address family bluetooth (Iv4) includes l2cap and rfcomm protocol

   -c, --continuous
       This will cause netstat to print the selected information every second

   -e, --extend
       Display additional information.  Use this option twice for maximum

   -o, --timers
       Include information related to networking timers.

   -p, --program
       Show the PID and name of the program to which each socket belongs.

   -l, --listening
       Show only listening sockets.  (These are omitted by default.)

   -a, --all
       Show both listening and non-listening sockets.  With the --interfaces
       option, show interfaces that are not up

       Print routing information from the FIB.  (This is the default.)

       Print routing information from the route cache.

   Active Internet connections (TCP, UDP, UDPLite, raw)
       The protocol (tcp, udp, udpl, raw) used by the socket.

       Established: The count of bytes not copied by the user program
       connected to this socket.  Listening: Since Kernel 2.6.18 this column
       contains the current syn backlog.

       Established: The count of bytes not acknowledged by the remote host.
       Listening: Since Kernel 2.6.18 this column contains the maximum size of
       the syn backlog.

   Local Address
       Address and port number of the local end of the socket.  Unless the
       --numeric (-n) option is specified, the socket address is resolved to
       its canonical host name (FQDN), and the port number is translated into
       the corresponding service name.

   Foreign Address
       Address and port number of the remote end of the socket.  Analogous to
       "Local Address".

       The state of the socket. Since there are no states in raw mode and
       usually no states used in UDP and UDPLite, this column may be left
       blank. Normally this can be one of several values:

              The socket has an established connection.

              The socket is actively attempting to establish a connection.

              A connection request has been received from the network.

              The socket is closed, and the connection is shutting down.

              Connection is closed, and the socket is waiting for a shutdown
              from the remote end.

              The socket is waiting after close to handle packets still in the

       CLOSE  The socket is not being used.

              The remote end has shut down, waiting for the socket to close.

              The remote end has shut down, and the socket is closed. Waiting
              for acknowledgement.

       LISTEN The socket is listening for incoming connections.  Such sockets
              are not included in the output unless you specify the
              --listening (-l) or --all (-a) option.

              Both sockets are shut down but we still don't have all our data

              The state of the socket is unknown.

       The username or the user id (UID) of the owner of the socket.

   PID/Program name
       Slash-separated pair of the process id (PID) and process name of the
       process that owns the socket.  --program causes this column to be
       included.  You will also need superuser privileges to see this
       information on sockets you don't own.  This identification information
       is not yet available for IPX sockets.

       (this needs to be written)

   Active UNIX domain Sockets
       The protocol (usually unix) used by the socket.

       The reference count (i.e. attached processes via this socket).

       The flags displayed is SO_ACCEPTON (displayed as ACC), SO_WAITDATA (W)
       or SO_NOSPACE (N).  SO_ACCECPTON is used on unconnected sockets if
       their corresponding processes are waiting for a connect request. The
       other flags are not of normal interest.

       There are several types of socket access:

              The socket is used in Datagram (connectionless) mode.

              This is a stream (connection) socket.

              The socket is used as a raw socket.

              This one serves reliably-delivered messages.

              This is a sequential packet socket.

              Raw interface access socket.

              Who ever knows what the future will bring us - just fill in here

       This field will contain one of the following Keywords:

       FREE   The socket is not allocated

              The socket is listening for a connection request.  Such sockets
              are only included in the output if you specify the --listening
              (-l) or --all (-a) option.

              The socket is about to establish a connection.

              The socket is connected.

              The socket is disconnecting.

              The socket is not connected to another one.

              This state should never happen.

   PID/Program name
       Process ID (PID) and process name of the process that has the socket
       open.  More info available in Active Internet connections section
       written above.

       This is the path name as which the corresponding processes attached to
       the socket.

   Active IPX sockets
       (this needs to be done by somebody who knows it)

   Active NET/ROM sockets
       (this needs to be done by somebody who knows it)

   Active AX.25 sockets
       (this needs to be done by somebody who knows it)

       /etc/services -- The services translation file

       /proc -- Mount point for the proc filesystem, which gives access to
       kernel status information via the following files.

       /proc/net/dev -- device information

       /proc/net/raw -- raw socket information

       /proc/net/tcp -- TCP socket information

       /proc/net/udp -- UDP socket information

       /proc/net/udplite -- UDPLite socket information

       /proc/net/igmp -- IGMP multicast information

       /proc/net/unix -- Unix domain socket information

       /proc/net/ipx -- IPX socket information

       /proc/net/ax25 -- AX25 socket information

       /proc/net/appletalk -- DDP (appletalk) socket information

       /proc/net/nr -- NET/ROM socket information

       /proc/net/route -- IP routing information

       /proc/net/ax25_route -- AX25 routing information

       /proc/net/ipx_route -- IPX routing information

       /proc/net/nr_nodes -- NET/ROM nodelist

       /proc/net/nr_neigh -- NET/ROM neighbours

       /proc/net/ip_masquerade -- masqueraded connections

       /sys/kernel/debug/bluetooth/l2cap -- Bluetooth L2CAP information

       /sys/kernel/debug/bluetooth/rfcomm -- Bluetooth serial connections

       /proc/net/snmp -- statistics

       route(8), ifconfig(8), iptables(8), proc(5) ss(8) ip(8)

       Occasionally strange information may appear if a socket changes as it
       is viewed. This is unlikely to occur.

       The netstat user interface was written by Fred Baumgarten
       <>, the man page basically by Matt
       Welsh <>. It was updated by Alan Cox
       <>, updated again by Tuan Hoang
       <>. The man page and the command included in the
       net-tools package is totally rewritten by Bernd Eckenfels
       <>.  UDPLite options were added by Brian Micek

net-tools                         2014-10-07                        NETSTAT(8)