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This is a free service.  Please don't abuse it.

* To test your IPv6 connection, try <https://6.rdns.scura.red/>.
* If you're on IPv6, you can see your IPv4 hostname (if you have one) at
      <https://4.rdns.scura.red/>.
* To combat DNS caching, you can use any subdomain of rdns.scura.red
  other than 6, 4, ipv6, or ipv4.
* To see your IP address, try <https://ip.scura.red/>.
* To see your user agent string, try <https://ua.scura.red/>.

This text will only be shown if your user agent string matches the regular
expression:
    /Firefox|Gecko|WebKit|Chrome|Safari|Opera|Edge|Servo|LibWeb|MSIE|Trident|NCSA_Mosaic|Validator/i
or if you use the query string "?info".  If your user agent string matches the
above regular expression or you use the query string "?html", then basic HTML
formatting will also be applied.

Otherwise, the info text will be hidden.  That way, you can use this page from
scripts using curl or similar commands.  You can also hide the info text using
the query string "?plain" or "?text".

For the source code, see <https://4.rdns.scura.red/index.phps>.