Netcraft first launched its anti-phishing system in 2005. All phishing sites are carefully validated before an alert is raised. Well over 169 million unique phishing sites have been detected and blocked by Netcraft’s system to date [January 2023] .

Netcraft’s malicious site feeds are used in all major web browsers and are licensed by many of the leading anti-virus, content filtering, web-hosting and domain registration companies.

Netcraft has worked with a wide range of security providers. Netcraft provides these services to security companies including McAfee and Trend Micro.