dnsx

# dnsx Use ProjectDiscovery `dnsx` to validate discovered hostnames and collect DNS records for in-scope assets. ## Help first Before constructing commands, run the installed help and use it as the source of truth: ```sh dnsx -h ``` ## Usage rules - Work only on in-scope domains, hostnames, or resolver tests. - Prefer a small, reviewed file or stdin batch. Do not feed unbounded discovery output directly into `dnsx`. - Confirm the input count before execution and split unexpectedly large lists into reviewed batches. - Use JSON output when results will be parsed or attached as evidence. - Treat DNS answers as time-sensitive and resolver-dependent. - Keep concurrency and query rates low by default, and save non-trivial outputs to files. - Use `dnsx` for batch validation and DNS records from discovered host lists; use `dig`, `nslookup`, or `whois` for targeted manual triage. ## Common workflows Resolve a discovered host list: ```sh dnsx -l names.txt -silent -threads 3 -rate-limit 10 -o resolved.txt ``` Write JSONL evidence when later parsing matters: ```sh dnsx -l names.txt -silent -threads 3 -rate-limit 10 -json -o dnsx.jsonl ``` Use a resolver file only when the task requires controlled resolver behavior: ```sh dnsx -l names.txt -r resolvers.txt -silent -threads 3 -rate-limit 10 -o resolved.txt ``` ## Output Report input scope, command used, resolver or record mode when relevant, output path, resolved count, and notable records.