app.br.                 	21600	IN  	NS	a.dns.br.
app.br.                 	21600	IN  	NS	b.dns.br.
app.br.                 	21600	IN  	NS	c.dns.br.
app.br.                 	21600	IN  	NS	d.dns.br.
app.br.                 	21600	IN  	NS	e.dns.br.
app.br.                 	21600	IN  	NS	f.dns.br.

app.br.                 	21600	IN  	SOA	a.dns.br. hostmaster.registro.br. 2025315176 1800 900 604800 900