SOCKSTAT(1) BSD General Commands Manual SOCKSTAT(1)NAMEsockstat — list open sockets
SYNOPSISsockstat [-46cLlu] [-p ports] [-P protocols]
The sockstat command lists open Internet or UNIX domain sockets.
The following options are available:
-4 Show AF_INET (IPv4) sockets.
-6 Show AF_INET6 (IPv6) sockets.
-c Show connected sockets.
-L Only show Internet sockets if the local or foreign addresses
are not in the loopback network prefix 127.0.0.0/8, or do not
contain the IPv6 loopback address ::1.
-l Show listening sockets.
-p ports Only show Internet sockets if either the local or foreign
port number is on the specified list. The ports argument is
a comma-separated list of port numbers and ranges specified
as first and last port separated by a dash.
Only show sockets of the specified protocols. The protocols
argument is a comma-separated list of protocol names, as they
are defined in protocols(5).
-u Show AF_LOCAL (UNIX) sockets.
If neither -4, -6 or -u is specified, sockstat will list sockets in all
If neither -c or -l is specified, sockstat will list both listening and
The information listed for each socket is:
USER The user who owns the socket.
COMMAND The command which holds the socket.
PID The process ID of the command which holds the socket.
FD The file descriptor number of the socket.
PROTO The transport protocol associated with the socket for
Internet sockets, or the type of socket (stream or data‐
gram) for UNIX sockets.
LOCAL ADDRESS For Internet sockets, this is the address the local end
of the socket is bound to (see getsockname(2)). For
bound UNIX sockets, it is the socket's filename. For
other UNIX sockets, it is a right arrow followed by the
endpoint's filename, or “??” if the endpoint could not
FOREIGN ADDRESS (Internet sockets only) The address the foreign end of
the socket is bound to (see getpeername(2)).
Note that TCP sockets in the AF_INET or AF_INET6 domains that are not in
one of the LISTEN, SYN_SENT, or ESTABLISHED states may not be shown by
sockstat; use netstat(1) to examine them instead.
SEE ALSOfstat(1), netstat(1), procstat(1), inet(4), inet6(4), protocols(5)HISTORY
The sockstat command appeared in FreeBSD 3.1.
The sockstat command and this manual page were written by Dag-Erling
BSD July 9, 2009 BSD