o1.ptr6783.switch.com has no CNAME records.
Question and response
Question
dig o1.ptr6783.switch.com. NS
Answer
The response has no answer records.
Authority
switch.com. 3363 SOA ns1.switch.com. hostmaster.switch.com. 2026021202 10800 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0