spamfilter4.loading.es has no NS records.
NS records for this zone are defined at loading.es.
NS records for this zone are defined at loading.es.
Question and response
Question
dig spamfilter4.loading.es. NS
Answer
The response has no answer records.
Authority
loading.es. 10800 SOA ns1.gandi.net. hostmaster.gandi.net. 1771505826 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0