fw001-ge-0-2-101-sc4.proofpoint.com has no NS records.
NS records for this zone are defined at proofpoint.com.
NS records for this zone are defined at proofpoint.com.
Question and response
Question
dig fw001-ge-0-2-101-sc4.proofpoint.com. NS
Answer
The response has no answer records.
Authority
proofpoint.com. 1200 SOA ns1.proofpoint.com. ops.proofpoint.com. 2018114854 28800 7200 604800 1200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0