But there is no problem to check it easily.
I can recommend the universal command netstat.
There are implementations on different OS.
Example of use:
Code: Select all
root@programator:/opt/eagle-9.2.1# netstat -ltnp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:8200 0.0.0.0:* LISTEN 920/minidlnad
tcp 0 0 127.0.0.1:37545 0.0.0.0:* LISTEN 6376/mono
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1/init
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 726/cupsd
tcp6 0 0 :::111 :::* LISTEN 1/init
tcp6 0 0 :::1716 :::* LISTEN 1335/kdeconnectd
tcp6 0 0 ::1:631 :::* LISTEN 726/cupsd
root@programator:/opt/eagle-9.2.1# netstat -tnp
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 192.168.26.15:41806 144.76.243.172:80 TIME_WAIT -
tcp 0 0 127.0.0.1:37545 127.0.0.1:48934 ESTABLISHED 6376/mono
tcp 0 0 192.168.26.15:39902 172.217.16.46:443 ESTABLISHED 1431/firefox-esr
tcp 0 0 192.168.26.15:55358 151.101.12.204:80 TIME_WAIT -
tcp 0 0 127.0.0.1:48934 127.0.0.1:37545 ESTABLISHED 6376/mono
tcp6 0 0 192.168.26.15:45008 192.168.26.26:1716 ESTABLISHED 1335/kdeconnectd
If you prefer to use applications with GUI, you may like Wireshark.