Domain Name Information Lookup

Search WHOIS, RDAP, DNS, and nameserver information for any domain name

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Comprehensive Domain & IP Information

Instantly look up registration data, contact details, nameservers, DNS records, and more for any domain name or IP address using WHOIS and RDAP protocols.

What is WHOIS?

WHOIS is a widely used internet protocol to query databases storing information about registered users of domain names, IP addresses, and autonomous systems. It helps you find owner contact details, registration dates, and nameserver information.

What is RDAP?

RDAP (Registration Data Access Protocol) is the modern successor to WHOIS. It provides a standardized, secure, and more structured way to access registration data, often offering richer information and better privacy controls.

Check domain availability, explore related domains, and view historical data where available.

RDAP Domain Lookup

Look up structured registration data for domains using the Registration Data Access Protocol

About RDAP

The Registration Data Access Protocol (RDAP) is a modern protocol designed to replace the traditional WHOIS protocol. It provides a standardized way to access domain registration data, offering more structured and secure data retrieval.


RDAP supports internationalization, secure access, and standardized responses, making it a more robust solution for accessing domain registration information.

DNS Record Lookup

Look up DNS records including A, AAAA, MX, NS, SOA, and CNAME records for any domain

About DNS Records

DNS (Domain Name System) records are instructions that provide information about a domain, including its IP addresses, mail servers, and other services. Common record types include:

  • SOA (Start of Authority) – Contains administrative information about the zone
  • NS (Nameserver) – Specifies authoritative nameservers for the domain
  • A (Address) – Maps a domain to an IPv4 address
  • AAAA – Maps a domain to an IPv6 address
  • CNAME (Canonical Name) – Creates an alias pointing to another domain
  • MX (Mail Exchange) – Specifies mail servers for the domain

Website Uptime Monitor

Monitor website availability and server information for any domain

Want to reliably monitor your website's status?

We provide 24/7 monitoring with instant alerts, detailed statistics, and customizable checks. Perfect for keeping your website reliable and your users happy.


One website free. No credit card required.


Metrics we monitor

  • Uptime Percentage: The percentage of time your website is accessible
  • Response Time: How quickly your server responds to requests
  • Status Codes: HTTP response codes indicating server status

About Website Uptime Monitoring

Use the Who.is uptime information to track the availability and server information of websites. This helps track:

  • Website availability and response status
  • Server software and configuration
  • Meta information including titles and descriptions
  • Historical uptime patterns

Disclaimer: Who.is is not affiliated with, endorsed by, or connected to any of the domains displayed on this page. We provide this information as a public service for informational purposes only.