Choose maximum of 3 nameservers. dns1 is obligatory, remaining 2 choose according to desired location of your client base
dns1.gnuhost.eu - Paris, EU ns2.gnuhost.eu - USA ns3.gnuhost.eu - Australia ns4.gnuhost.eu - USA ns5.gnuhost.eu - Russia ns6.gnuhost.eu - Canada ns7.gnuhost.eu - India