rip.psg.com has no NS records.
NS records for this zone are defined at psg.com.
NS records for this zone are defined at psg.com.
Question and response
Question
dig rip.psg.com. NS
Answer
The response has no answer records.
Authority
psg.com. 14400 SOA rip.psg.com. hostmaster.psg.com. 1771527822 86400 3600 2592000 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0