$TTL 300
@ 			IN SOA	hoster.tld. ns.tld. (
				2010   	; serial
				600     ; refresh
				600     ; retry
				1200    ; expire
				600     ; minimum
				)

 		NS	ns
ns		A	10.52.0.2

example		NS 	ns.example

ns.example	A 	10.53.0.20
ns.example	A 	10.53.0.21
ns.example	A 	10.53.0.22
ns.example	A 	10.53.0.23
ns.example	A 	10.53.0.24
ns.example	A 	10.53.0.25
ns.example	A 	10.53.0.26
ns.example	A 	10.53.0.27
ns.example	A 	10.53.0.28
ns.example	A 	10.53.0.29
ns.example	A 	10.53.0.30
ns.example	A 	10.53.0.31
ns.example	A 	10.53.0.32
ns.example	A 	10.53.0.33
ns.example	A 	10.53.0.34
ns.example	A 	10.53.0.35
ns.example	A 	10.53.0.36
ns.example	A 	10.53.0.37
ns.example	A 	10.53.0.38
ns.example	A 	10.53.0.39
ns.example	A 	10.53.0.40
ns.example	A 	10.53.0.41
ns.example	A 	10.53.0.42
ns.example	A 	10.53.0.43

ns.example	AAAA 	2001:db8::20
ns.example	AAAA 	2001:db8::21
ns.example	AAAA 	2001:db8::22
ns.example	AAAA 	2001:db8::23
ns.example	AAAA 	2001:db8::24
ns.example	AAAA 	2001:db8::25
ns.example	AAAA 	2001:db8::26
ns.example	AAAA 	2001:db8::27
ns.example	AAAA 	2001:db8::28
ns.example	AAAA 	2001:db8::29
ns.example	AAAA 	2001:db8::30
ns.example	AAAA 	2001:db8::31
ns.example	AAAA 	2001:db8::32
ns.example	AAAA 	2001:db8::33
ns.example	AAAA 	2001:db8::34
ns.example	AAAA 	2001:db8::35
ns.example	AAAA 	2001:db8::36
ns.example	AAAA 	2001:db8::37
ns.example	AAAA 	2001:db8::38
ns.example	AAAA 	2001:db8::39
ns.example	AAAA 	2001:db8::40
ns.example	AAAA 	2001:db8::41
ns.example	AAAA 	2001:db8::42
ns.example	AAAA 	2001:db8::43