ip-170.244.99.26.dtel.com.br has no NS records.
NS records for this zone are defined at dtel.com.br.
NS records for this zone are defined at dtel.com.br.
Question and response
Question
dig ip-170.244.99.26.dtel.com.br. NS
Answer
The response has no answer records.
Authority
dtel.com.br. 900 SOA d.sec.dns.br. hostmaster.registro.br. 2026043000 86400 900 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0