Dynu offers a range of services as well as its free DDNS package and one of those other items is an SSL certificate. The company provides certificates from trusted authorities, such as Comodo and Thawte and these certificates can be used with dynamic addressing. ChangeIP provides domain and SSL monitoring in its Premium Dynamic DNS package but you have to pay separately for the SSL certificate that CangeIP will provide. Duck DNS has a site-wide DNS that covers customers who use its free dynamic DNS service