mail.claro.net.pe has no NS records.
NS records for this zone are defined at claro.net.pe.
NS records for this zone are defined at claro.net.pe.
Question and response
Question
dig mail.claro.net.pe. NS
Answer
The response has no answer records.
Authority
claro.net.pe. 600 SOA dns1.amx.com.pe. hostmaster.claro.net.pe. 2017050301 5400 600 90000 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0