Damian lupinski
Damian lupinski voted up Soul Fly's answer

NS can be short for Nameservers. Nameservers resolve to sets of I.P. addresses. Domains can have have multiple Nameservers associated with them. This may explain the results you are seeing.

Damian lupinski
Damian lupinski voted up Soul Fly's answer

NS can be short for Nameservers. Nameservers resolve to sets of I.P. addresses. Domains can have have multiple Nameservers associated with them. This may explain the results you are seeing.