WHOIS Lookup
Shows domain registration, registrar, nameservers and expiry, plus RDAP data where it exists.
Who registered a domain, through which registrar, when it expires and which nameservers it points at. The answer comes from RDAP where the registry offers it and from port-43 WHOIS where it does not, including KRNIC’s Korean-language format for .kr.
Our server asks RDAP — the registry’s JSON API — first, and falls back to WHOIS on port 43 through IANA, then the registry, then the registrar. Only the domain name is sent.
How to use it
Enter the domain, not the URL
example.com, not https://example.com/page. A registration exists for the registrable name only; subdomains have no registration of their own.
Read the expiry pill first
It turns amber inside thirty days and red once the date has passed. An expired domain usually still resolves for a while, which is exactly why the date is worth checking rather than the site.
Check the EPP status codes
These are what actually block a transfer or a change. clientTransferProhibited is normal and protective; pendingDelete or redemptionPeriod means the clock has already run out.
Common questions
Why is the registrant hidden?
Most registries redact personal data by default — GDPR for gTLDs, and .kr withholds individual registrants outright. What you get instead is the registrar and an abuse address, which is the route intended for complaints.
RDAP and WHOIS gave different fields
They are different protocols with different schemas, and registries fill them out to different depths. The panel says which one answered, so you can tell whether a missing field is genuinely absent or just not carried by that source.
Does looking a domain up tell the owner?
No. The query goes to the registry or registrar’s WHOIS service, never to the domain’s own servers. The domain owner sees nothing.
Can I use this to see whether a name is free?
A "no such domain" answer is a good sign but not a reservation — availability is only real at the moment a registrar takes your order. Some registries also hold names in reserved or premium lists that WHOIS does not explain.
Feed it from
DNS Lookup
Queries A, AAAA, CNAME, MX, TXT, NS, SOA, SRV, CAA and PTR records over DoH, with TTL and the DNSSEC bit shown, from Cloudflare or Google.
IP Address Info
Shows your public IP or any address with its reverse name, ASN, announcing network, prefix and registry country from Team Cymru’s DNS data — no city-level geolocation.
DNS Propagation Check
Queries the same record from public DoH resolvers — Google, Cloudflare, Quad9, OpenDNS, AdGuard, NextDNS, Mullvad, DNS.SB, AliDNS — and shows which still hold the old answer.
Suspicious URL Check
Inspects a link’s shape before you open it — lookalike characters, IP-literal hosts, @ tricks, deep subdomains, odd ports, shorteners — and on request traces its redirects and looks up the domain’s registration date. No reputation database.
Next
These accept what this tool produces, so the result can go straight in.
DNS Lookup
Queries A, AAAA, CNAME, MX, TXT, NS, SOA, SRV, CAA and PTR records over DoH, with TTL and the DNSSEC bit shown, from Cloudflare or Google.
IP Address Info
Shows your public IP or any address with its reverse name, ASN, announcing network, prefix and registry country from Team Cymru’s DNS data — no city-level geolocation.
SSL Certificate Checker
Connects to a host, shows the served chain, expiry, protocol and cipher support, and flags chain gaps.
Suspicious URL Check
Inspects a link’s shape before you open it — lookalike characters, IP-literal hosts, @ tricks, deep subdomains, odd ports, shorteners — and on request traces its redirects and looks up the domain’s registration date. No reputation database.
HTTP Request Builder
Composes and sends a GET/POST/PUT/PATCH/DELETE/HEAD request with custom headers and a body, and shows the status, headers, body and timing — without ever forwarding cookies or Authorization.
HTTP Header Inspector
Fetches a URL and shows the full response headers, redirect chain, timings and compression used.