Check domain registration details with whois
Query the registry record for a domain to see its registrar, expiry date, and nameservers without opening a browser.
Run `whois example.com` for the full record, or pipe it through `grep -iE 'registrar|expir|name server'` to see just the key fields.
01Command
Command
$ whois example.com | grep -iE 'registrar|expir|name server'02What it does
The whois protocol returns a wall of text including boilerplate and disclaimers; grepping for `registrar`, `expir`, and `name server` surfaces the fields you actually care about. Expiry dates are handy before renewals, and nameservers confirm whether a DNS change has propagated to the registry. For an IP instead of a domain, `whois 1.2.3.4` shows the owning network and abuse contact.
03Risk
!Warning: Whois servers throttle aggressive querying — if you script bulk lookups, add delays or you'll get rate-limit errors instead of data.
04Undo
✓No undo needed — this command does not change persistent state.
05Sources
- whois(1) — client for the whois directory serviceEvidence: Documents the whois client's default lookup behavior and support for querying specific whois servers.
Last verified: 2026-09-17 · Category: Network