Free, instant, and no account
Every tool on this page is genuinely free and works without signing up. Type in a domain and you get a clean, readable answer in seconds — the registration record, whether a name is available, when it expires, the state of its SSL certificate, or its live DNS records. There's nothing to install and no credit card involved; they're here to be useful on their own.
A one-off check, or continuous monitoring?
These tools answer a question right now. But most domain problems happen in the gap between checks — a certificate that lapses next month, a registration that expires while you're on holiday, a DNS record that changes without anyone noticing. That's what domain monitoring is for: instead of you remembering to run a check, it re-checks the domains you own around the clock and alerts you the moment something changes. Use the tools for a quick look; add a domain to the app when you want it watched for you.
Check any domain — you don't have to own it
Because they read public registration, certificate and DNS data, the tools work on any domain: your own, a client's, or one you're thinking of buying. Monitoring is the opposite — it's for the domains you actually own and want to protect. Between the two, you can both investigate a domain today and keep it safe tomorrow.