What is a registrar company
A domain registrar is the company that your domain is registered through. There is usually an annual bill for a domain name registration and the registrar is the company that you are paying.
How to find your registrar
- It's likely you have received invoices for your domain name by email it is best to search your email history for these emails to find out the registrar/company you are using. Try searching for your full domain name as a starting point. You should have a email from them with the original account creation and billing information which you can use to log in and gain access.
- Failing this you can do a WHOIS lookup, the easiest way to do this is through the lookup website https://who.is/, enter your top level domain name, for example "mydomain.com" and click search. Look for the Registrar information this shows the company that the domain is currently hosted with. If this looks foreign check the Admin, Technical and Billing contacts and email addresses for any company name that looks familiar. You may also find a colleagues details which you can use to track things down further.
- Some WHOIS lookups don't return the results you might be looking for, instead they return a link to a provider website where you can then search for the specific details. For example, most Australian .AU domain names are like this. In the public WHOIS results you might receive a message like "Visit whois.ausregistry.com.au for Web based WhoIs" which requires you to go to that website to perform the search and get the full results. It just depends where your domain is registered and how much information they make publicly available.