spf.ntt.eu has no NS records.
NS records for this zone are defined at ntt.eu.
NS records for this zone are defined at ntt.eu.
Question and response
Question
dig spf.ntt.eu. NS
Answer
The response has no answer records.
Authority
ntt.eu. 600 SOA ns0.ci.nttsvc.com. hostmaster.ntt.eu. 1773202432 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0