ntpgru1.ntppool.net has no NS records.
NS records for this zone are defined at ntppool.net.
NS records for this zone are defined at ntppool.net.
Question and response
Question
dig ntpgru1.ntppool.net. NS
Answer
The response has no answer records.
Authority
ntppool.net. 600 SOA ns1.us.bitnames.com. dnsoper.bitnames.com. 2026022201 600 900 3628800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0