Question and response
Question
dig 67-231-158-10.proofpoint.com. A
Answer
67-231-158-10.proofpoint.com. 3600 A 67.231.158.10
Authority
proofpoint.com. 3600 NS ns3.proofpoint.com.
proofpoint.com. 3600 NS pdns99.ultradns.org.
proofpoint.com. 3600 NS pdns99.ultradns.com.
proofpoint.com. 3600 NS pdns99.ultradns.biz.
proofpoint.com. 3600 NS pdns99.ultradns.net.
proofpoint.com. 3600 NS ns1.proofpoint.com.
Additional
ns3.proofpoint.com. 1800 A 208.84.66.208
ns1.proofpoint.com. 1800 A 208.84.67.208
ns3.proofpoint.com. 1800 AAAA 2620:100:9004:1:0:0:0:d0
ns1.proofpoint.com. 1800 AAAA 2620:100:9000:1:0:0:0:d0
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0