inadyn - 2.11.0-1+b2 main

It is used in routers and Internet gateways to automate the task of
keeping your DNS record up to date with any IP address changes from
your ISP. It can also be used in installations with redundant backup
connections to the Internet.
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Inadyn can maintain multiple host names with the same IP address, and
has a HTTP/HTTPS based IP detection which runs well behind a NAT
router.
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Selected DDNS providers are supported natively, see inadyn(8) for the
complete list. Other providers can be supported using the generic
DDNS plugin. Some of these services are free of charge for
non-commercial use. Others take a small fee but provide more domains
to choose from.