addr.tools

https://challenges.addr.tools This is a helper tool for performing dns-01 ACME challenges. It serves the DNS validation and acts as a CNAME target.

https://dyn.addr.tools Simple dynamic DNS server that can be used without an account.

https://header-echo.addr.tools See the HTTP request headers. With URL parameters, the returned response can be customized.

https://info.addr.tools Get information about IP addresses or domains.

https://info.addr.tools/example.com
https://info.addr.tools/1.1.1.1
https://info.addr.tools/2606:4700:4700::1111
https://info.addr.tools/me

https://ip.addr.tools Return any IP address, e.g., 192-0-2-1.ip.addr.tools. Dynamic DNS updates for _acme-challenge are possible.

https://myip.addr.tools Query your own IP address.

https://dnscheck.tools Prints information about the currently used recursive DNS resolver and the DNSSEC implementation support.

https://myaddr.tools Free dynamic DNS service.