Infrastructure
What is Registrar?
The company through which a domain name is registered. Registration records and dates are collection material.
A registrar is a company accredited to sell and manage domain names, such as Namecheap or GoDaddy. Every registered domain has a registrar, a registration date and contact records, though much of the contact detail is now hidden by privacy services.
Registrar choice, registration timing, name servers and payment patterns are useful clustering signals. Threat actors often register batches of domains at the same registrar on the same day.