wtilab3cx.wi.3cx.us has no NS records.
NS records for this zone are defined at wi.3cx.us.
NS records for this zone are defined at wi.3cx.us.
Question and response
Question
dig wtilab3cx.wi.3cx.us. NS
Answer
The response has no answer records.
Authority
wi.3cx.us. 300 SOA ns-cloud-b1.googledomains.com. cloud-dns-hostmaster.google.com. 2 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0