To register expiring domain you must use drop catching services. I will list the best drop catching services for you.

*.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.* | *.*