smtp.iclaro.com.ec has no NS records.
NS records for this zone are defined at iclaro.com.ec.
NS records for this zone are defined at iclaro.com.ec.
Question and response
Question
dig smtp.iclaro.com.ec. NS
Answer
The response has no answer records.
Authority
iclaro.com.ec. 900 SOA dns1.porta.net. hostmaster.claro.com.ec. 24 28800 18000 604800 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0