o2.ptr771.zycus.com has no NS records.
NS records for this zone are defined at zycus.com.
NS records for this zone are defined at zycus.com.
Question and response
Question
dig o2.ptr771.zycus.com. NS
Answer
The response has no answer records.
Authority
zycus.com. 600 SOA a1-16.akam.net. hostmaster.akamai.com. 2019085777 3600 900 1728000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0