Netcraft Browser Extension

The Netcraft anti-phishing browser extension provides comprehensive site information and phishing protection when browsing the web. Users can also use the extension to report URLs they believe to be malicious to Netcraft.


Why use the Netcraft Extension?

  • Protect your savings from Phishing attacks.
  • Protect your credit card information from being stolen by shopping site skimmers
  • See the hosting location and Risk Rating of every site you visit (as well as other information).
  • Help defend the Internet community from fraudsters.
  • Check if a website supports Perfect Forward Secrecy (PFS).
  • See if a website is affected by the aftermath of the Heartbleed vulnerability
  • Stop web miners from slowing down your computer

The Netcraft anti-phishing community is effectively a giant neighbourhood watch scheme, empowering the most alert and most expert members to defend everyone within the community against phishing attacks. Once the first recipients of a phishing mail have reported the target URL, it is blocked for community members as they subsequently access the URL. Widely disseminated attacks simply mean that the phishing attack will be reported and blocked sooner.

“Been testing the @Netcraft toolbar, and it’s amazingly good at blocking phishing. They’re a threat intel provider, so this is a direct feed.”

Browse in Safety

Key features of the Netcraft Extension:

  1. Site Reports: Link to a detailed report about the site, helping you to make informed choices about their integrity.
  2. Risk Ratings: We evaluate the characteristics of the site and compare these against those depicted by fraudulent sites. The result is a simple visual summary displayed on the Extension. A lower risk rating is better as it indicates lower risk.

  3. Additional information about the site at a glance, including:

    • Country: The country where the site is hosted
    • First seen: The first Netcraft Web Server Survey this site was seen in
    • Site rank: The popularity of the site amongst Netcraft extension users.
    • Host: The name of the organisation hosting the site
    • PFS: Check if sites using SSL for encryption support Perfect Forward Secrecy (PFS). PFS ensures that if the private key of the site is compromised - for example by a court order, social engineering, an attack against the site, or cryptanalysis - your historical encrypted traffic remains safe.
    • SSLv3: Indicates whether the web server supports SSLv3, which could mean that a downgrade attack is possible.

  4. Report suspected phishing sites: At the click of the button you can report suspected web forgeries to Netcraft, helping to protect the community. Netcraft operates an incentive scheme for Phishing site submissions, including iPads, backpacks, and mugs.


The Netcraft Extensions also:

  • Traps suspicious URLs containing characters which have no common purpose other than to deceive.
  • Clearly displays sites’ hosting location, including country, helping you to evaluate fraudulent urls.

Download now:

The browser extension can be downloaded for free from your browser’s store.