Need ddns is not expiring domain. the beauty of domain a do not care. Who knows this?
In General, there are two programs a client and a server.
the second looks for the first domain.
Generally need a ddns to suggest that once he was beaten and forgotten.
noip letters to once a month sucks. Have Mikrotik has its own ddns, but are available only for their irons. Buy the cheapest Board, at the same time to update it he will.
In General, 1 time set it and forget it does not happen. Everything is free today - gone tomorrow.
Use for about a year.
No evidence times a month not. Many different ways to upgrade.
Comfortable on pieces of iron, because you can just pull the URL with a unique key.