CODEWITHSUNDEEP
macosnetwork-programming
jcm
jcm

Reputation: 5659

How to find the java process that is using a port

I have a small Java ServerSocket application that is running on port 4444. I wanted to see the process using that port in my OSX terminal, and my first thought was to do the following:

netstat -a | grep 4444 however, this doesn't give me any results.

lsof -i :4444 and I get the following (correct) result:

COMMAND   PID        USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
java    66389 admin   18u  IPv6 0x1ae123a422ebe931      0t0  TCP *:krb524 (LISTEN)

Could someone tell me why netstat doesn't show the port but lsof does?

Upvotes: 2

Views: 6482

Answers (1)

ericzundel
ericzundel

Reputation: 550

Netstat probably does list your task, but with an alias 'krb524' instead of the port number. Those aliases are listed in /etc/services. 

$ grep 4444 /etc/services
krb524          4444/udp    # KRB524
krb524          4444/tcp    # KRB524

To see just port numbers with netstat, add the -n parameter.

netstat -a -n | grep 4444

Upvotes: 2

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