mms.hoy.es has no NS records.
NS records for this zone are defined at hoy.es.
NS records for this zone are defined at hoy.es.
Question and response
Question
dig user.miramimovil.com. NS
Answer
The response has no answer records.
Authority
com. 900 SOA a.gtld-servers.net. nstld.verisign-grs.com. 1773494806 1800 900 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0