_int1.imrm.com has no NS records.
NS records for this zone are defined at imrm.com.
NS records for this zone are defined at imrm.com.
Question and response
Question
dig _int1.imrm.com. NS
Answer
The response has no answer records.
Authority
imrm.com. 900 SOA nusdnsgm01.ironmountain.com. webmaster.ironmountain.com. 2005030557 10800 3600 2592000 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0