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Do I need to keep port 43 open even if I don't run a DNS server?

Posted on 2009-05-03
Medium Priority
Last Modified: 2013-12-16

I am configuring iptables on my linux box (Centos 5.3) and I am wondering if I need to accept input and output packets on port 43 even when I don't have a DNS server on the box?

Question by:tomp_gl
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Assisted Solution

Macros82 earned 1000 total points
ID: 24292078
This is a port for Whois.Is the (whois service) used to provide domain-level info.

If you are nto running a whois server then you have no need for this port to be enabled.

Author Comment

ID: 24292161
I was just thinking, wouldn't the box need to perform a DNS lookup for "localhost" for some services?

Assisted Solution

Macros82 earned 1000 total points
ID: 24292187
By default localhost is hardcoded in the host file located at


Accepted Solution

Macros82 earned 1000 total points
ID: 24292214
Sorry didnt see linux. Scratch the "\winnt\system32" part! :D
It will be located in Etc\hosts however

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