waterloo.usa.hp.com has no NS records.
NS records for this zone are defined at usa.hp.com.
NS records for this zone are defined at usa.hp.com.
Question and response
Question
dig waterloo.usa.hp.com. NS
Answer
The response has no answer records.
Authority
usa.hp.com. 900 SOA txa01hpiibpe.ams.hp.net. hostmaster.hp.com. 443260684 3600 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0