I have not used no-ip. For the one that I proposed above, I have been used for several years without too much problems except two server shutdowns for unknown reasons. There are many paid dynamic DNS companies but I do not remember them at this moment. You may make a search on Internet.
Thanks CHing ,how about no-ip? which is better?I am finding some dyndns server, but don't know which is good ?! However, DYNDNS is too expensive now! In 2014, it costs me US$67.5 for five years but now it requests US$99 for only 2 years!!