DynDNS IP updater
Download from PortableApps.com
DynDNS Simply Client Portable can run from a cloud folder, external drive, or local folder without installing into Windows. It's even better with the PortableApps.com Platform for easy installs and automatic updates.
DynDNS Simply Client allows you to automatically update your DynDNS hostname to point to your current IP while on the go. You enter your DynDNS login details, select the time period to automatically poll, and go.