netstat results show only few sessions

admin@hosting-prd:~$ netstat -an | grep ":22"
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
tcp        0      0 172.20.3.235:22         10.12.112.166:59433     ESTABLISHED
tcp        0      0 172.20.3.235:44410      119.59.100.92:22        TIME_WAIT
tcp        0      0 172.20.3.235:44380      119.59.100.92:22        TIME_WAIT
tcp        0      0 172.20.3.235:44444      119.59.100.92:22        TIME_WAIT
tcp        0      0 172.20.3.235:22         172.20.3.103:49241      ESTABLISHED
tcp        0     52 172.20.3.235:22         10.12.112.166:62392     ESTABLISHED
tcp6       0      0 :::22                   :::*                    LISTEN
admin@hosting-prd:~$