域名 / Whois

查询域名注册信息、域名服务器、到期日期和SSL证书状态。

What is WHOIS?

WHOIS is a query and response protocol used for querying databases that store registered domain names, IP addresses, and their owners. It provides information about domain registration, expiration dates, registrar details, and nameservers. This information is essential for network administrators, security researchers, and legal purposes.

How Domain Lookup Works

Domain lookup queries multiple sources: WHOIS servers maintained by domain registries provide registration details, DNS servers return name resolution records, and SSL/TLS connections reveal certificate information. Each Top-Level Domain (TLD) has its own WHOIS server with potentially different data formats.

Cron 解析器
  • Checking domain availability for purchase
  • Verifying website ownership and legitimacy
  • Investigating potential phishing or scam sites
  • 正在查询域名信息...
  • Gathering information for legal or security purposes
IP 信息
  • Domain registrar and registration dates
  • Domain owner (if not privacy-protected)
  • Nameservers and DNS configuration
  • SSL certificate issuer and expiration
  • Domain status (active, locked, etc.)
Frequently Asked Questions

Why is WHOIS information hidden for some domains?

Many registrars offer WHOIS privacy protection services that replace the owner's personal information with the registrar's or a proxy service's details. This protects domain owners from spam and unwanted contact.

What is RDAP?

RDAP (Registration Data Access Protocol) is the modern replacement for WHOIS. It provides the same information in a standardized, machine-readable JSON format with better security and access control features.