s2.teliadns.com has no NS records.
NS records for this zone are defined at teliadns.com.
NS records for this zone are defined at teliadns.com.
Question and response
Question
dig s2.teliadns.com. NS
Answer
The response has no answer records.
Authority
teliadns.com. 3600 SOA s2.teliadns.com. backbone.telia.net. 8 3600 1800 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0