mail.prolipa.com.ec has no NS records.
NS records for this zone are defined at prolipa.com.ec.
NS records for this zone are defined at prolipa.com.ec.
Question and response
Question
dig mail.prolipa.com.ec. NS
Answer
The response has no answer records.
Authority
prolipa.com.ec. 1800 SOA bob.ns.cloudflare.com. dns.cloudflare.com. 2397347102 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0