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Registrar Lookup

Identify the specific company or technical registrar where a domain is currently registered.

ENTITY: ICANN Accredited Registrar
SOURCE: WHOIS Database
IANA ID: Registrar IANA ID

What is Registrar Lookup?

A domain registrar is a business that handles the reservation of domain names as well as the assignment of IP addresses (like GoDaddy, Namecheap, or MarkMonitor). This tool tells you which company controls the domain invoice.

How it Works

The tool extracts the "Registrar" and "Registrar IANA ID" fields from the domain's root authoritative WHOIS record, skipping over registrant contact data.

Key Use Cases

Finding out where to log in to renew a domain you own but forgot the host for.

Filing abuse complaints. If a domain is hosting malware, you must contact its registrar to have it suspended.

Analyzing market share of different registry providers.

Advanced Details

Some registrars use "Reseller" labels. The company you physically paid might be a reseller for a larger wholesale registrar (like OpenSRS or Enom). Only the wholesale registrar is listed in the official record.

Cybersecurity Pros & Cons

Security Advantages
  • Identifying the registrar is the first step in filing an abuse complaint to take down a malicious domain quickly.
  • Enterprise-grade registrars (MarkMonitor, CSC) offer registry locks — identifying them confirms stronger domain hijacking protection.
  • Registrar data helps security teams assess whether a suspicious domain was registered through a privacy-friendly, abuse-tolerant registrar.
  • Knowing the registrar enables targeted UDRP (domain dispute) filings against typosquatters and brand abusers.
Security Limitations
  • Many privacy-focused or offshore registrars are slow or non-responsive to abuse complaints, delaying takedowns.
  • Reseller chains obscure the real registrar, slowing abuse reporting to the responsible party.
  • Registrar account compromise (via phishing or credential stuffing) is the primary domain hijacking vector.
  • Some registrars do not enforce registry locks by default, leaving high-value domains unnecessarily exposed.
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