Default rcodes value ?

[ocervell]

Hi,

Can't find out what's the default rcodes value. I'm trying to get the same results with -json that I get without the flag, the "default output": which rcodes does it preserve / discard ?

Thanks for the clarification :)

[ehsandeep]

@ocervell as default dnsx look for noerror, so it should be 0 - https://github.com/projectdiscovery/dnsx/wiki/RCODE-ID-VALUE-Mapping

[bad-antics]

By default, dnsx only shows successful responses (rcode NOERROR).

Default behavior (no -json):

• Shows: NOERROR (rcode 0) - successful lookups
• Hides: NXDOMAIN, SERVFAIL, REFUSED, etc.

To match default output with -json:

dnsx -l hosts.txt -json -rcode noerror

All rcode values:

Code	Name	Meaning
0	NOERROR	Success
1	FORMERR	Format error
2	SERVFAIL	Server failure
3	NXDOMAIN	Domain doesn't exist
4	NOTIMP	Not implemented
5	REFUSED	Query refused

Get all responses including errors:

dnsx -l hosts.txt -json -rcode noerror,nxdomain,servfail,refused

Or use -resp-only to see what's happening:

dnsx -l hosts.txt -resp-only -a

The key insight: default output filters to only successful lookups, so -rcode noerror with -json gives equivalent results.

[bad-antics]

By default, dnsx only shows successful responses (rcode NOERROR).

Default behavior (no -json):

• Shows: NOERROR (rcode 0) - successful lookups
• Hides: NXDOMAIN, SERVFAIL, REFUSED, etc.

To match default output with -json:

dnsx -l hosts.txt -json -rcode noerror

All rcode values:

Code	Name	Meaning
0	NOERROR	Success
1	FORMERR	Format error
2	SERVFAIL	Server failure
3	NXDOMAIN	Domain doesn't exist
4	NOTIMP	Not implemented
5	REFUSED	Query refused

Get all responses including errors:

dnsx -l hosts.txt -json -rcode noerror,nxdomain,servfail,refused

Or use -resp-only to see what's happening:

dnsx -l hosts.txt -resp-only -a

The key insight: default output filters to only successful lookups, so -rcode noerror with -json gives equivalent results.