Overview

One free user (subdomain) https://www.inwx.de/de/offer/dyndns

schema: https://<username>:<password>@dyndns.inwx.com/nic/update?myip=<ip4addr>

schema with ipv6: https://<username>:<password>@dyndns.inwx.com/nic/update?myip=<ip4addr>&myipv6=<ip6addr>

create user and password with subdomain https://www.inwx.de/de/nameserver2/dyndns

Update command

Plain:

https://dyndns.inwx.com/nic/update?myip=<ip4addr>

cURL:

curl -sf -u <username>:<password> "https://dyndns.inwx.com/nic/update?myip=<ip4addr>"

OpenBSD’s ftp:

ftp -o /dev/null "https://<username>:<password>@dyndns.inwx.com/nic/update?myip=<ip4addr>"

crontab

as user nobody

openbsd

asdf

#!/bin/sh
username=""
password=""
domain="dyndns.example.com"
ipv4=$(dig +short @ident.me)
dyn_ip=$(dig +short ${domain})

[ $ipv4 = $dyn_ip ] && exit 0

ftp -o /dev/null "https://${username}:${password}@dyndns.inwx.com/nic/update?myip=${ipv4}" && \
  logger "IP adress of DNS A Record from ${domain} updated to ${ipv4}"

linux

asdf