netstat
netstat is used mainly to figure out what kind of socket application is running and which port is assigned to each of those application.
C:\>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..
Example 1: -------------------------------------------------------------
C:\>netstat -af
Active Connections
Proto Local Address Foreign Address State
TCP 192.168.0.13:56767 65.49.56.57:ftp ESTABLISHED
TCP 192.168.0.13:56968 server1103.teamviewer.com:5938 ESTABLISHED
TCP 192.168.0.13:57254 192.168.0.1:http TIME_WAIT
Example 2: -------------------------------------------------------------
C:\>netstat -aof
Active Connections
Proto Local Address Foreign Address State PID
TCP 192.168.0.13:56968 server1103.teamviewer.com:5938 ESTABLISHED 2884
TCP 192.168.0.13:57285 65.49.56.51:ftp ESTABLISHED 8320
TCP 192.168.0.13:57443 192.168.0.1:http TIME_WAIT 0
TCP 192.168.0.13:57444 192.168.0.1:http TIME_WAIT 0
TCP 192.168.0.13:57446 192.168.0.1:http TIME_WAIT 0
TCP 192.168.0.13:57447 192.168.0.1:http TIME_WAIT 0
Example 3: -------------------------------------------------------------
C:\>netstat -aof
Active Connections
Proto Local Address Foreign Address State PID
TCP [::]:21 SN6201142744:0 LISTENING 1552 <--ftp server
TCP [::]:80 SN6201142744:0 LISTENING 4 <--http server
UDP 192.168.1.2:53 *:* 4272 <--dns server
UDP 192.168.1.2:5060 *:* 4272 <--IMS CSCF
UDP [2001:0:0:1::2]:53 *:* 4272 <--dns server
UDP [2001:0:0:1::2]:5060 *:* 4272 <--IMS CSCF
Example 4: -------------------------------------------------------------
C:\>netstat -a -n -o
Active Connections
Proto Local Address Foreign Address State PID
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING 1004
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING 4
TCP 0.0.0.0:52230 0.0.0.0:0 LISTENING 2344
TCP 127.0.0.1:843 0.0.0.0:0 LISTENING 72716
TCP 127.0.0.1:2000 127.0.0.1:49205 ESTABLISHED 2464
TCP 127.0.0.1:5939 0.0.0.0:0 LISTENING 66696
TCP 127.0.0.1:49159 127.0.0.1:49182 ESTABLISHED 2964
TCP 127.0.0.1:49159 127.0.0.1:49183 ESTABLISHED 2964
TCP [::]:135 [::]:0 LISTENING 1004
TCP [::]:445 [::]:0 LISTENING 4
TCP [::1]:49186 [::1]:49229 ESTABLISHED 4032
TCP [::1]:49229 [::1]:49186 ESTABLISHED 6904
TCP [fd33:fba1:99eb:d8d4:26d9:7188:b4ed:8e2d]:4002 [::]:0 LISTENING 7336
UDP 0.0.0.0:68 *:* 608
UDP 0.0.0.0:68 *:* 608
UDP 0.0.0.0:123 *:* 1064
UDP 0.0.0.0:500 *:* 1096
UDP 127.0.0.1:50731 *:* 3296
UDP [fe80::2c3e:aabf:6ffa:8145%12]:1900 *:* 2176
UDP [fe80::2c3e:aabf:6ffa:8145%12]:5353 *:* 2964
UDP [fe80::2c3e:aabf:6ffa:8145%12]:60481 *:* 2176