DevToolsForYou
Private by defaultRuns in your browser

WHOIS lookup

Enter a domain, IP address, or ASN to retrieve registration data via RDAP — the modern successor to WHOIS.

Quick samples
Related toolsAll Network & DNS →

IP Address Lookup

Look up geolocation, ISP, ASN, and network details for any IP address or domain — or detect your own IP instantly.

DNS Lookup

Query DNS records for any domain — A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, PTR, or all at once.

DNS Propagation Checker

Check whether your DNS change has propagated across 10 global resolvers — see which ones have updated and which still serve the old record.

MX Record Checker

Check MX records, SPF, DMARC, and DKIM configuration for any domain — with an email security score.

SSL Certificate Checker

Inspect the full SSL/TLS certificate chain for any domain — validity, expiry, issuer, SANs, fingerprints, and key details.

IP Blacklist Checker

Check whether an IPv4 address is listed on any of 17 DNS-based blacklists used by spam filters and firewalls worldwide.

WHOIS

About this tool

Find domain registration info, owner details, nameservers, creation and expiry dates for any domain, IP, or ASN via RDAP — no signup.

Enter a domain, IP address, or ASN to retrieve registration data via RDAP — the modern successor to WHOIS.

No signup requiredRuns in your browserInstant results
How to use
  1. 1

    Enter a domain name, IPv4/IPv6 address, or ASN (e.g. AS15169) in the input field.

  2. 2

    Click Look Up to fetch registration data via RDAP.

  3. 3

    View the registrar, creation date, expiry date, nameservers, and contact details.

Why use this tool?
  • →

    Check a domain's expiry date before it gets snapped up by a competitor.

  • →

    Find the registrar and nameservers for a domain you're troubleshooting.

  • →

    Look up the owner and contact details behind an IP address or ASN.

ExamplesInput → output

Domain lookup

Inputgithub.com
OutputRegistrar: MarkMonitor — Expires: 2025-10-09

IP lookup

Input1.1.1.1
OutputNetwork: 1.1.1.0/24 — Cloudflare, Inc.

ASN lookup

InputAS15169
OutputGoogle LLC — ARIN registered
Frequently asked questionsCommon questions answered

These answers explain common whois tasks, expected input formats, and edge cases so both visitors and search engines can understand what this tool does.

What is RDAP?

RDAP (Registration Data Access Protocol) is the modern replacement for the legacy WHOIS protocol. It returns structured JSON instead of unformatted text, supports internationalized domain names, and enforces consistent data formats across registrars.

Why is some registrant data redacted?

Privacy protection services — offered by most registrars — replace personal contact information with the registrar's proxy details. This is standard practice under GDPR and other privacy regulations.

Can I look up an IP address or ASN?

Yes. Enter an IPv4 or IPv6 address to see the network's registered range and operator. Enter an ASN like AS15169 to see the organization that holds it.