56.48-63.158.251.200.in-addr.arpa has no NS records.
NS records for this zone are defined at 48-63.158.251.200.in-addr.arpa.
NS records for this zone are defined at 48-63.158.251.200.in-addr.arpa.
Question and response
Question
dig 56.48-63.158.251.200.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
48-63.158.251.200.in-addr.arpa. 86400 SOA ns.embratel.net.br. admin.embratel.net.br. 2020111201 3600 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0