Every year, millions of domain names are lost. What happens after domain expires? How long will your domain wait for you before someone grabs it? And how to omit this?
Monitor your domains for any changes. You can keep an eye on the state of available domains which you like, but don’t forget your own ones too. There is a wide variety of services, like HostTracker, which provide an easy, efficient way to track any changes of domain’s state.