spf.esvacloud.com has no NS records.
NS records for this zone are defined at esvacloud.com.
NS records for this zone are defined at esvacloud.com.
Question and response
Question
dig spf.esvacloud.com. NS
Answer
The response has no answer records.
Authority
esvacloud.com. 1800 SOA clark.ns.cloudflare.com. dns.cloudflare.com. 2397520443 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0