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IP Mailer became ChkIP

ChkIP used to available under the name IP Mailer, but when the product was totally rewritten and re-designed in 2012 to be a product in the cloud, it was renamed as well. Welcome to the new and improved IP Mailer (originally launched in 2001).

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IP Mailer Popularity

"IP Mailer 2004" stopped resolving external IP addreses on January 21st 2013. The IP Mailer Windows application, at the time it was disabled, resolved an external IP address for customers once every 2 seconds or less. The IP Mailer server received over 29 million requests for external IP address per year!

Does your IP Address keep changing?

  • Keep track of the IP (external and internal) address your PC is located at.
  • Track what networks your notebook is using when travelling.
  • Know the external IP address of servers you need to access.
  • See the geograpic location of the IP address.
  • ChkIP sends an email (to any amount of recipients) when the IP changes.
Try out ChkIP for 30 days for free. All you need to do is Register and install the ChkIP Client.

For continued monitoring of your IP address you can buy a one year Subscription for USD $14.99 by clicking the button below. Your purchase will show up automatically in your ChkIP account (use the same email address you used for registering!)

Buy 1 Year of ChkIP Now

How it works

The ChkIP Monitor application you install on your PC will regularly check with our server (ChkIP Server) what your current external IP Address is. Additionally on Windows it monitors whether there are changes to the Internal IP address, and if the Internal address changes it triggers the system to check whether the External address has changed too. If it has changed, then our server will send out the emails about the change to the recipients you have selected to receive the notification.

Email your IP address, to yourself or anyone else, automatically!

If your ISP gives your computer, or your router/gateway, a dynamic IP (Internet Protocol) address that changes from time to time, you can email your IP address automatically to your friends and office/home so that you can find your computer for remote access regardless of the constantly changing IP address. If you use your computer remotely or need to have other people access some server functionality on your PC you can let them know what your IP address is automatically when it changes by letting ChkIP handle the situation.

ChkIP constantly monitors your IP, and once you connect with your modem or your IP changes for some other reason, ChkIP will detect it automatically. And ChkIP will also resolve the geographical location (99% of world covered on City level, and approximately 80% correctly resolved within 25 miles of true location) of the IP address and include the information in the email and online logs so you can track where your computer is.

ChkIP can also additionally send you the IP address daily, whether it has changed or not. The Daily Email can include the result of a Ping to the last IP address to help you determine whether the system at that IP address is still alive or not.

ChkIP, IP Monitor

Is the right tool for you when

  • You have remote-control software installed on your computer, and need to know where it is (it's IP address) in order to use it.
  • Web and FTP servers with dynamic IP addresses has to be accessible by you or your friends.
  • You want to keep a log of what networks your notebook has used (for the traveller).
  • You want to know when your IP address has changed automatically.


  • Monitoring client for Windows XP, Vista, 7, 8 and Windows 10 (Windows Service that works regardless if a user is logged in or not)
  • Monitoring client for PHP systems! (Build your own ChkIP client with the free PHP source code, that is available for download for registered users)
  • Free for 30 days
  • Your IP addresses are logged at ChkIP for your own review (nobody else can access them)