diff --git a/README.md b/README.md
index 2c1b9e4..0685040 100644
--- a/README.md
+++ b/README.md
@@ -550,6 +550,7 @@ Only main chapters:
 &nbsp;&nbsp; <a href="https://tools.keycdn.com/curl"><b>Online Curl</b></a> - curl test, analyze HTTP Response Headers.<br>
 &nbsp;&nbsp; <a href="https://extendsclass.com/"><b>Online Tools for Developers</b></a> - HTTP API tools, testers, encoders, converters, formatters, and other tools.<br>
 &nbsp;&nbsp; <a href="https://ping.eu/"><b>Ping.eu</b></a> - online Ping, Traceroute, DNS lookup, WHOIS and others.<br>
+&nbsp;&nbsp; <a href="https://checkip.tools/"><b>checkip.tools</b></a> - free IP and network toolbox: IP/DNS/WHOIS lookup, ping, port checker, header inspectors. 18 languages, no tracking.<br>
 &nbsp;&nbsp; <a href="https://network-tools.com/"><b>Network-Tools</b></a> - network tools for webmasters, IT technicians & geeks.<br>
 &nbsp;&nbsp; <a href="https://bgpview.io/"><b>BGPview</b></a> - search for any ASN, IP, Prefix or Resource name.<br>
 &nbsp;&nbsp; <a href="https://isbgpsafeyet.com/"><b>Is BGP safe yet?</b></a> - check BGP (RPKI) security of ISPs and other major Internet players.<br>