spf.ecentry.io has no NS records.
NS records for this zone are defined at ecentry.io.
NS records for this zone are defined at ecentry.io.
Question and response
Question
dig spf.ecentry.io. NS
Answer
The response has no answer records.
Authority
ecentry.io. 1800 SOA alex.ns.cloudflare.com. dns.cloudflare.com. 2396800896 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0