diff --git a/Appendix-A---Test-Sites.md b/Appendix-A---Test-Sites.md
index 00126e4..d34ddff 100644
--- a/Appendix-A---Test-Sites.md
+++ b/Appendix-A---Test-Sites.md
@@ -60,6 +60,7 @@ These are good sources to grab information on your results in one hit, but **do
 - [IPv6 Leak](https://ipv6leak.com/) - **h**ttps://ipv6leak.com/
 - [Keyboard Events](https://w3c.github.io/uievents/tools/key-event-viewer.html) - **h**ttps://w3c.github.io/uievents/tools/key-event-viewer.html
    * [Hotkeys Testing](https://rawgit.com/jeresig/jquery.hotkeys/master/test-static-01.html) - **h**ttps://rawgit.com/jeresig/jquery.hotkeys/master/test-static-01.html
+- [Ping Spotter](https://armin.dev/apps/ping-spotter/) - **h**ttps://armin.dev/apps/ping-spotter/
 - [Popup Killer](http://www.kephyr.com/popupkillertest/index.html) - **h**ttp://www.kephyr.com/popupkillertest/index.html
 - [Popup Test](http://www.popuptest.com/) - **h**ttp://www.popuptest.com/
 - [Punycode](https://www.xn--80ak6aa92e.com/) - **h**ttps://www.xn--80ak6aa92e.com/ (www . apple . com)