spf.gestour.com has no NS records.
NS records for this zone are defined at gestour.com.
NS records for this zone are defined at gestour.com.
Question and response
Question
dig spf.gestour.com. NS
Answer
The response has no answer records.
Authority
gestour.com. 600 SOA mucdns01.amadeus-dns.com. nicadmin.amadeus.com. 1467 3600 1200 2592000 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0