only check previously used nameservers if we have any
only check previously used nameservers if we have any

NZRS/dnscheck,NZRS/dnscheck,dotse/dnscheck,NZRS/dnscheck,dotse/dnscheck,dotse/dnscheck,NZRS/dnscheck,dotse/dnscheck,dotse/dnscheck,NZRS/dnscheck,dotse/dnscheck,NZRS/dnscheck