This is a test.
Question and response
Question
dig ic4-privaterelay.appleid.com. TXT
Answer
ic4-privaterelay.appleid.com. 3600 TXT "This is a test."
ic4-privaterelay.appleid.com. 3600 TXT "v=spf1 ip4:17.58.22.9 ip4:17.58.22.30 -all"
Authority
ic4-privaterelay.appleid.com. 3600 NS a.ns.apple.com.
ic4-privaterelay.appleid.com. 3600 NS b.ns.apple.com.
ic4-privaterelay.appleid.com. 3600 NS c.ns.apple.com.
ic4-privaterelay.appleid.com. 3600 NS d.ns.apple.com.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0