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