WHOIS Lookup

See who registered a domain, when it was created, when it expires, who the registrar is, whether DNSSEC is signed and the registrar abuse contact — all in one query, with RDAP data straight from the registry. Bulk mode handles up to 100 domains in one go.

Free to use, no signup. On the next page you confirm before we run the check.

What this check returns

Domain: The domain name that was queried.
Registrar: Company through which the domain is registered.
Registrar IANA ID: IANA-assigned numeric ID identifying the registrar.
Created: Date the domain was first registered.
Expires: Date the domain registration expires and must be renewed.
Expires in: Days remaining until the registration expires.
Last update: Most recent change to the WHOIS/RDAP record — transfer, nameserver edit or contact update.
Domain status: EPP status codes set on the domain (e.g. clientTransferProhibited).
Nameservers: Authoritative DNS servers responsible for the domain.
DNSSEC: Whether the registry has a DS record for the domain — Signed means the delegation is secured by DNSSEC.
Reseller: Reseller brand the domain was sold through, when the registrar exposes one.
Registrant: Registered organisation, when the record is not GDPR-redacted.
Registrar URL: Public homepage of the accredited registrar.
Abuse contact: Registrar abuse-reporting email — ICANN requires this to stay public.
Abuse phone: Registrar abuse-reporting phone number.

WHOIS & RDAP domain lookup

Discover detailed registration information for any domain. YouMonit pulls data straight from the authoritative registry — the same source registrars use — so you get fresh, structured answers instead of brittle screen-scraped output.

What is WHOIS (and RDAP)?

WHOIS is the long-standing protocol that returns information about a domain's registration — who registered it, when, with which registrar, and the technical contacts behind it. Behind the scenes we use RDAP, the modern HTTPS/JSON replacement for classic port-43 WHOIS. RDAP returns the same data — registrar, registration and expiry dates, nameservers, EPP status codes, DNSSEC signing — but in a typed, standardised format and over a TLS-encrypted channel.

Why look this data up?

Domain research and due diligence

Before buying a domain or entering a partnership, the WHOIS record tells you how old the domain is, which registrar holds it and when it expires — three signals that quickly weed out throw-away domains.

Trademark protection

Brand owners use WHOIS to track look-alike registrations, monitor new ones that target their brand, and gather evidence for takedown notices and UDRP cases.

Technical troubleshooting

Pull the authoritative nameservers in one query, confirm a domain isn't on registry hold, and reach the registrar's published abuse contact when something is misbehaving.

Security and fraud investigation

Phishing and malware campaigns leave WHOIS fingerprints — registration age, registrar IANA ID, nameserver pattern. Use those signals to triage indicators of compromise.

Expiry monitoring

The Expires in field on every result tells you exactly how many days remain on the registration — useful both for protecting domains you own and spotting drops you might want to catch.

What you get back

Domain: Normalised domain name. The tool auto-strips http(s)://, www. and trailing slashes so paste-from-URL still works.
Registrar: The ICANN-accredited registrar that holds the registration — e.g. GoDaddy, Namecheap, Gandi, Cloudflare Registrar.
Registrar IANA ID: Unique registrar number assigned by IANA — handy for automated workflows and when registrar branding changes.
Created: When the domain was first registered. Useful as an age signal — older domains tend to have more established authority and trust.
Expires & Expires in: Renewal date plus a human-friendly countdown. After the expiry date the domain enters a registrar-controlled grace period before becoming available again.
Last update: Most recent WHOIS-side change — typically a registrar transfer, nameserver change or contact update.
Domain status: One or more EPP status codes the registry has set on the domain — for example clientTransferProhibited (registrar-lock against unauthorised transfers), serverHold (domain not resolving, often non-payment or legal), redemptionPeriod (expired, still restorable for a fee), or pendingDelete (about to be released).
Nameservers: The authoritative DNS servers configured for the domain — where every external DNS resolver goes for the canonical records.
DNSSEC: Whether the registry signs the delegation — Signed means there's a chain of trust between the TLD and the domain's keys, Unsigned means no DS records are published.
Reseller: When the registrar sold through a reseller, this shows the reseller brand. Common with Namecheap-style platforms and large hosting providers.
Registrant: Registered organisation, when the WHOIS record is not redacted. GDPR and similar laws cause most personal registrations to be hidden behind a privacy proxy — but corporate registrations are still routinely public.
Abuse contact & phone: Published abuse-reporting channel for the registrar. Required to be public under ICANN policy, even when the registrant is redacted.
Registrar URL: Public homepage of the registrar — convenient when you need to look up a transfer authorisation form or a registrar's terms.

How our service works

Input cleanup. URLs, schemes, www. and trailing paths are stripped so a paste from the address bar still resolves cleanly.
RDAP bootstrap. We hit rdap.org, which routes the query to the authoritative RDAP server for the right TLD — gTLDs and most modern ccTLDs are supported.
Structured parsing. The JSON response is walked field by field: events, entities, vCard, secureDNS and EPP status codes are turned into the columns you see in the table.
Bulk mode. Submit up to 100 domains at once — each one runs through the same pipeline and lands in the results table side by side.

Privacy & the post-GDPR WHOIS

Since GDPR landed in 2018, ICANN-accredited registrars redact personal contact details from public WHOIS by default. You'll still get the registrar, dates, status codes, nameservers, DNSSEC, registrar IANA ID and abuse contact — those are not redacted — but the registrant identity is typically replaced with a privacy-service placeholder. Country-code TLDs each set their own policy; some publish everything, others publish almost nothing.

Supported domain extensions

Any TLD that publishes an RDAP server through the IANA bootstrap registry — that means:

Generic TLDs — .com, .net, .org, .info, .biz, .name, and every new gTLD that went live after 2014.
Country-code TLDs — .uk, .de, .fr, .cz, .sk, .nl, .ca, .au, .jp, .us and most other RDAP-enabled ccTLDs.
New gTLDs — .app, .dev, .blog, .shop, .tech, .online, .site, .io and many more.

Restricted TLDs such as .gov, .edu, .mil and a handful of ccTLDs don't publish an RDAP endpoint — for those we return whatever the bootstrap returns, which is usually a 404 or 501.

Best practices

For domain owners

Keep your registrar account contact info current — that's where renewal and transfer notices go.
Lock your domain with clientTransferProhibited and enable two-factor auth at the registrar.
Renew early — registrar grace periods exist, but recovery during redemptionPeriod usually costs 10× the renewal fee.

For researchers

Cross-reference WHOIS with current DNS (use the DNS tool) — registrations and authoritative DNS sometimes drift.
Privacy-proxied registrations still leak signals: registrar choice, registration date and nameserver pattern.
Treat WHOIS as one input among many — corroborate before acting on the data.

WHOIS vs DNS

WHOIS tells you who owns the domain and how it was registered; DNS tells you what the domain currently resolves to. The two answer different questions and often live in different systems — a domain can be parked at one registrar while pointing its DNS at an entirely separate hosting provider. For the resolving side, pair this tool with DNS records, domain & IP lookup and blacklist check.

Limitations

Privacy/proxy services obscure registrant identity on most consumer registrations.
WHOIS data isn't real-time — a transfer or renewal may take minutes to surface.
Historical ownership isn't available — we only return the current snapshot.
A handful of ccTLDs and special-use TLDs have no RDAP server; those queries fail.
WHOIS data must not be used for marketing, spam or other prohibited purposes.

Get started

Type or paste a domain in the form above. For a single domain you'll get the full record card; for several domains the result renders as a side-by-side comparison table you can export as CSV, JSON, YAML or XML.