mail.apropo.org.pe has no NS records.
NS records for this zone are defined at apropo.org.pe.
NS records for this zone are defined at apropo.org.pe.
Question and response
Question
dig mail.apropo.org.pe. NS
Answer
The response has no answer records.
Authority
apropo.org.pe. 3600 SOA dns3.unired.net.pe. hostmaster.unired.net.pe. 2019032466 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0