After using netstat -lnp I wonder how comes some of the result don't show any PID/Program name? Should I be worried? See below:
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:33223 0.0.0.0:* LISTEN 31952/dart
tcp 0 0 127.0.0.1:5037 0.0.0.0:* LISTEN 13351/adb
tcp 0 0 127.0.0.1:41741 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:5939 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:5433 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:5434 0.0.0.0:* LISTEN -
tcp6 0 0 ::1:33223 :::* LISTEN 31952/dart
tcp6 0 0 127.0.0.1:63342 :::* LISTEN 1061/java
tcp6 0 0 ::1:631 :::* LISTEN -
tcp6 0 0 127.0.0.1:8599 :::* LISTEN 1061/java
tcp6 0 0 :::25 :::* LISTEN -
tcp6 0 0 127.0.0.1:6942 :::* LISTEN 1061/java
udp 0 0 224.0.0.251:5353 0.0.0.0:* 26664/chrome
udp 0 0 224.0.0.251:5353 0.0.0.0:* 26664/chrome
udp 0 0 224.0.0.251:5353 0.0.0.0:* 26705/chrome --type
udp 0 0 127.0.0.53:53 0.0.0.0:* -
udp 0 0 0.0.0.0:68 0.0.0.0:* -
udp 0 0 0.0.0.0:631 0.0.0.0:* -
raw6 0 0 :::58 :::* 7 -
I have identified some of them:
In netstat, you won't see PIDs if it is a kernel process. Also, like @Mathias Weidner was suggesting, you won't see the PID if the user invoking netstat isn't privileged enough.
Collected from the Internet
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