To register a domain you must do that through a registrant. Below are Tanzania domains lists and their prices. co.tz, or.tz, go.tz, ac.tz, sc.tz, tv.tz, info.tz, ne.tz, hotel.tz others are mobi.tz, me.tz, mil.tz.
For nursery, primary and secondary schools domains is .sc.tz