netstat的Foreign Address为什么端口是80或443?

Question

命令的解释

Foreign Address

Address and port number of the remote end of the socket. Analogous to "Local Address".

netstat -tulnp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      1904/sshd           
tcp        0      0 127.0.0.1:631               0.0.0.0:*                   LISTEN      1750/cupsd          
tcp        0      0 0.0.0.0:44567               0.0.0.0:*                   LISTEN      1713/rpc.statd      
tcp        0      0 0.0.0.0:10050               0.0.0.0:*                   LISTEN      1965/zabbix_agentd  
tcp        0      0 172.172.230.211:3306        0.0.0.0:*                   LISTEN      31849/mysqld        
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      1576/rpcbind        
tcp        0      0 172.172.230.211:46327       172.172.100.3:80            TIME_WAIT   -                   
tcp        0      0 172.172.230.211:46329       172.172.100.3:80            TIME_WAIT   -                   
tcp        0     52 172.172.230.211:22          172.172.173.222:50043       ESTABLISHED 6095/sshd           
tcp        0      0 172.172.230.211:46326       172.172.100.3:80            TIME_WAIT   -                   
tcp        0      0 172.172.230.211:5401        172.172.100.3:443           TIME_WAIT   -                   
tcp        0      0 :::22                       :::*                        LISTEN      1904/sshd           
tcp        0      0 ::1:631                     :::*                        LISTEN      1750/cupsd          
tcp        0      0 :::11776                    :::*                        LISTEN      1713/rpc.statd      
tcp        0      0 :::10050                    :::*                        LISTEN      1965/zabbix_agentd  
tcp        0      0 :::111                      :::*                        LISTEN      1576/rpcbind        

我不明白的是为什么端口是80或443，含义是什么？不应该是随机端口吗？

Answer 1

80端口是默认的HTTP端口
443端口是默认的HTTPS端口