luffy@Mugiwara-Crew:~$ sudo lsof -i -n
[sudo] password for luffy: 
COMMAND     PID   USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
cupsd      1318   root   10u  IPv6 1405308      0t0  TCP [::1]:ipp (LISTEN)
cupsd      1318   root   11u  IPv4 1405309      0t0  TCP 127.0.0.1:ipp (LISTEN)
cups-brow  1319   root    8u  IPv4 1405335      0t0  UDP *:ipp 
firefox    2074  luffy   75u  IPv4 1495053      0t0  TCP 192.168.1.6:58346->172.217.17.138:https (ESTABLISHED)
firefox    2074  luffy  142u  IPv4 1456279      0t0  TCP 192.168.1.6:43088->104.25.60.112:https (ESTABLISHED)
dnsmasq    2652 nobody    4u  IPv4   41341      0t0  UDP 127.0.1.1:domain 
dnsmasq    2652 nobody    5u  IPv4   41342      0t0  TCP 127.0.1.1:domain (LISTEN)
dnsmasq    2652 nobody   11u  IPv4  436742      0t0  UDP *:34369 
dhclient  26082   root    6u  IPv4  436698      0t0  UDP *:bootpc 
luffy@Mugiwara-Crew:~$ man netstat
luffy@Mugiwara-Crew:~$ netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 Mugiwara-Crew:domain    *:*                     LISTEN     
tcp        0      0 localhost:ipp           *:*                     LISTEN     
tcp        0      0 192.168.1.6:55362       93.184.220.29:http      ESTABLISHED
tcp        0      0 192.168.1.6:43062       ec2-52-37-48-84.u:https ESTABLISHED
tcp        0      0 192.168.1.6:58346       ams15s30-in-f10.1:https TIME_WAIT  
tcp        0      0 192.168.1.6:43088       104.25.60.112:https     ESTABLISHED
tcp6       0      0 ip6-localhost:ipp       [::]:*                  LISTEN     
udp        0      0 *:34369                 *:*                                
udp        0      0 Mugiwara-Crew:domain    *:*                                
udp        0      0 *:bootpc                *:*                                
udp        0      0 *:ipp                   *:*                                
raw6       0      0 [::]:ipv6-icmp          [::]:*                  7