spam.igetapp.com has no NS records.
NS records for this zone are defined at igetapp.com.
NS records for this zone are defined at igetapp.com.
Question and response
Question
dig spam.igetapp.com. NS
Answer
The response has no answer records.
Authority
igetapp.com. 1800 SOA uma.ns.cloudflare.com. dns.cloudflare.com. 2395252277 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0