mx2.1984.is has no NS records.
NS records for this zone are defined at 1984.is.
NS records for this zone are defined at 1984.is.
Question and response
Question
dig mx2.1984.is. NS
Answer
The response has no answer records.
Authority
1984.is. 86400 SOA ns0.1984.is. hostmaster.1984.is. 2014122814 3600 900 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0