Register.com – one of the world’s largest internet registrars – is warning people to change their password and monitor their credit card account for suspicious activity following a massive security breach.

A registrar is a company that sells and manages domains, or website addresses. Register.com is popular with Kiwis – and millions of others worldwide – who want to get a “.com” address.

An email to Register.com customers sent this morning NZT, says the company learned on October 16 that “a third-party gained unauthorized access” in late August.