spb.bwtele.com has no NS records.
NS records for this zone are defined at bwtele.com.
NS records for this zone are defined at bwtele.com.
Question and response
Question
dig spb.bwtele.com. NS
Answer
The response has no answer records.
Authority
bwtele.com. 1800 SOA plato.ns.cloudflare.com. dns.cloudflare.com. 2396643316 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0