spf2.esputnik.com has no NS records.
NS records for this zone are defined at esputnik.com.
NS records for this zone are defined at esputnik.com.
Question and response
Question
dig spf2.esputnik.com. NS
Answer
The response has no answer records.
Authority
esputnik.com. 900 SOA ns-1170.awsdns-18.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0