wroclaw.pl.		30 IN SOA a-dns.pl. dnsmaster.nask.pl. (
				1731396636 ; serial
				900        ; refresh (15 minutes)
				300        ; retry (5 minutes)
				2592000    ; expire (4 weeks 2 days)
				3600       ; minimum (1 hour)
				)

Name servers:
wroclaw.pl.		30 IN NS a-dns.pl.
wroclaw.pl.		30 IN NS b-dns.pl.
wroclaw.pl.		30 IN NS d-dns.pl.
wroclaw.pl.		30 IN NS f-dns.pl.
wroclaw.pl.		30 IN NS h-dns.pl.
wroclaw.pl.		30 IN NS j-dns.pl.