ss - another utility to investigate sockets


ss [options] [ FILTER ]


ss is used to dump socket statistics. It allows showing information similar to netstat. It can display more TCP and state informations than other tools.


These programs follow the usual GNU command line syntax, with long options starting with two dashes (‘-’). A summary of options is included below.
-h, --help Show summary of options.
-V, --version
 Output version information.
-n, --numeric
 Do now try to resolve service names.
-r, --resolve
 Try to resolve numeric address/ports.
-a, --all Display all sockets.
-l, --listening
 Display listening sockets.
-o, --options
 Show timer information.
-e, --extended
 Show detailed socket information
-m, --memory
 Show socket memory usage.
-p, --processes
 Show process using socket.
-i, --info Show internal TCP information.
-s, --summary
 Print summary statistics. This option does not parse socket lists obtaining summary from various sources. It is useful when amount of sockets is so huge that parsing /proc/net/tcp is painful.
-4, --ipv4 Display only IP version 4 sockets (alias for -f inet).
-6, --ipv6 Display only IP version 6 sockets (alias for -f inet6).
-0, --packet
 Display PACKET sockets.
-t, --tcp Display only TCP sockets.
-u, --udp Display only UDP sockets.
-d, --dccp Display only DCCP sockets.
-w, --raw Display only RAW sockets.
-x, --unix Display only Unix domain sockets.
-f FAMILY, --family=FAMILY
 Display sockets of type FAMILY. Currently the following families are supported: unix, inet, inet6, link, netlink.
-A QUERY, --query=QUERY
 List of socket tables to dump, separated by commas. The following identifiers are understood: all, inet, tcp, udp, raw, unix, packet, netlink, unix_dgram, unix_stream, packet_raw, packet_dgram.
-D FILE Do not display anything, just dump raw information about TCP sockets to FILE after applying filters. If FILE is - stdout is used.
-F FILE, --filter=FILE
 Read filter information from FILE. Each line of FILE is interpreted like single command line option. If FILE is - stdin is used.
 Please take a look at the official documentation (Debian package iproute-doc) for details regarding filters.


ss -t -a
 Display all TCP sockets.
ss -u -a
 Display all UDP sockets.
ss -o state established ’( dport = :ssh or sport = :ssh )’
 Display all established ssh connections.
ss -x src /tmp/.X11-unix/*
 Find all local processes connected to X server.
ss -o state fin-wait-1 ’( sport = :http or sport = :https )’ dst 193.233.7/24
 List all the tcp sockets in state FIN-WAIT-1 for our apache to network 193.233.7/24 and look at their timers.


ip(8), /usr/share/doc/iproute-doc/ss.html (package iproute­doc)


ss was written by Alexey Kuznetosv, <>.

This manual page was written by Michael Prokop <> for the Debian project (but may be used by others).

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