linuxwebspace.eu.	30 IN SOA dns1.a1.net. domainadmin.a1.net. (
				2019021300 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				1814400    ; expire (3 weeks)
				3600       ; minimum (1 hour)
				)

Name servers:
linuxwebspace.eu.	30 IN NS dns3.a1.net.
linuxwebspace.eu.	30 IN NS dns2.a1.net.
linuxwebspace.eu.	30 IN NS dns1.a1.net.