What is an ISP?

An ISP or Internet Service Provider is a company which provides you with Internet access. They act as a gateway and billing system between your home network and the general Internet.

What does this test show?

We use your public IP address to determine who owns it. Every ISP with IP addresses allocated to it must update their information in a public registry.

The ISP test is useful if you're using a web proxy or VPN and expect your true ISP to be masked from others online. Use this tool to check you are indeed connecting from a VPN or proxy.

Can my ISP watch my Internet activity?

Yes. All Internet activity passes through the ISPs network and will be subject to monitoring. Some ISPs only monitor general traffic to ensure their network is delivering good performance to users. The majority of ISPs conduct dragnet surveillance by logging all your web, email and P2P activity for government spy programs. Use a private VPN to prevent this.

What is the Reverse DNS result above?

DNS is a way to look up IP addresses for a given domain name. For example typing "google.com" into your browser will be converted into an IP address for fetching the web page. Reverse DNS is the opposite - looking up the hostname of an IP. This reverse DNS shows your ISP's given name for the IP address you're using. Sometimes this can give away interesting information about an ISP's true provider (if they are simply a reseller) or other clues about their network infrastructure.

What is an AS number for my ISP?

The AS number or Autonomous System number represents a unique code issued to ISPs and transit companies. This unique code is used in routing tables to decide how Internet traffic should travel between ISPs for specific routes.