dns2.orion.rs has no NS records.
NS records for this zone are defined at orion.rs.
NS records for this zone are defined at orion.rs.
Question and response
Question
dig dns2.orion.rs. NS
Answer
The response has no answer records.
Authority
orion.rs. 300 SOA auth1.oriontelekom.com. admin.oriontelekom.rs. 2026031001 7200 1800 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0