-wd parameter usage issue

[Ghs0my]

I currently have a list of subdomains, can I specify the -wd parameter when querying the A record?It seems not to be working.

command：
dnsx -l subdomains.txt -a -resp -silent -wd xxx.com

[dogancanbakir]

Tracked at #887

[bad-antics]

The -wd flag in dnsx is for wildcard domain filtering, not for specifying a base domain for lookups. It filters out wildcard DNS records — domains where *.example.com resolves to an IP, which would give you false positives in subdomain enumeration.

What -wd does: It checks if the domain has a wildcard record and excludes those results.

What you probably want — if you have a list of hostnames and want to resolve their A records:

# Just resolve A records from your subdomain list
dnsx -l subdomains.txt -a -resp -silent

If your subdomains.txt contains bare names like www, mail, api and you want to append a base domain:

# Add the base domain to each line first
cat subdomains.txt | sed 's/$/.xxx.com/' | dnsx -a -resp -silent

Or use -d to set the base domain with a wordlist:

dnsx -d xxx.com -w wordlist.txt -a -resp -silent

Summary of the flags:

• -l — input list of FQDNs to resolve
• -d — base domain (used with -w wordlist for bruteforcing)
• -w — wordlist of subdomains to prepend to -d
• -wd — wildcard filtering domain (for removing false positives)