A python script which checks at regular intervals if your IPs (IPv4 and IPv6) have changed. If changes are detected, an HTTP POST request is sent to inwx.com in order to update the A and AAAA record. To use this script, you need to have created at least one DynDNS account on inwx.com.
The script expects a TOML file /etc/inwx_update_dyndns.toml where your credentials are set. Have a look at the
example file, which should be self-explanatory. At the very least, you need to
update the username and password for the [[account]]. If you don't have an IPv6, ipv6_enabled should be set to false.
For ArchLinux, a package is available on AUR.