ip6.arpa	IN	NS	a.ip6-servers.arpa
ip6.arpa	IN	NS	b.ip6-servers.arpa
ip6.arpa	IN	NS	c.ip6-servers.arpa
ip6.arpa	IN	NS	d.ip6-servers.arpa
ip6.arpa	IN	NS	e.ip6-servers.arpa
ip6.arpa	IN	NS	f.ip6-servers.arpa