ss

ss is a tool to investigate sockets. It is similar to netstat, but shows more information. To see list of all open ports, run

ss -tlnp

Example

boby@sok-01:~$ sudo ss -lntp
State   Recv-Q  Send-Q    Local Address:Port     Peer Address:Port  Process                                                                                                                                
LISTEN  0       128           127.0.0.1:7878          0.0.0.0:*      users:(("ssh",pid=2401,fd=5))                                                                                                         
LISTEN  0       80            127.0.0.1:3306          0.0.0.0:*      users:(("mysqld",pid=1135,fd=19))                                                                                                     
LISTEN  0       4096            0.0.0.0:111           0.0.0.0:*      users:(("rpcbind",pid=880,fd=4),("systemd",pid=1,fd=34))                                                                              
LISTEN  0       511             0.0.0.0:80            0.0.0.0:*      users:(("nginx",pid=1147,fd=10),("nginx",pid=1146,fd=10),("nginx",pid=1145,fd=10),("nginx",pid=1144,fd=10),("nginx",pid=1143,fd=10))  
LISTEN  0       32        192.168.122.1:53            0.0.0.0:*      users:(("dnsmasq",pid=1528,fd=6))                                                                                                     
LISTEN  0       4096      127.0.0.53%lo:53            0.0.0.0:*      users:(("systemd-resolve",pid=883,fd=13))                                                                                             
LISTEN  0       5             127.0.0.1:631           0.0.0.0:*      users:(("cupsd",pid=929,fd=7))                                                                                                        
LISTEN  0       511           127.0.0.2:443           0.0.0.0:*      users:(("nginx",pid=1147,fd=11),("nginx",pid=1146,fd=11),("nginx",pid=1145,fd=11),("nginx",pid=1144,fd=11),("nginx",pid=1143,fd=11))  
LISTEN  0       1               0.0.0.0:7070          0.0.0.0:*      users:(("anydesk",pid=1054,fd=32))                                                                                                    
LISTEN  0       128               [::1]:7878             [::]:*      users:(("ssh",pid=2401,fd=4))                                                                                                         
LISTEN  0       4096               [::]:111              [::]:*      users:(("rpcbind",pid=880,fd=6),("systemd",pid=1,fd=36))                                                                              
LISTEN  0       5                 [::1]:631              [::]:*      users:(("cupsd",pid=929,fd=6))                                                                                                        
boby@sok-01:~$ 

See netstat

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