4t.de.			30 IN SOA ns.4teachers.de. root.4teachers.de. (
				2022022501 ; serial
				28800      ; refresh (8 hours)
				7200       ; retry (2 hours)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)

4t.de.			30 IN A	212.7.187.132

Mail exchangers:
4t.de.			30 IN MX 100 mx2.4teachers.de.

Name servers:
4t.de.			30 IN NS ns-b.ktk.io.
4t.de.			30 IN NS ns-a.ktk.de.
4t.de.			30 IN NS ns-c.ktk.de.