app4.syncedtool.com has no CNAME records.
Question and response
Question
dig app4.syncedtool.com. NS
Answer
The response has no answer records.
Authority
syncedtool.com. 5893 SOA ns1.efscloud.net. root.efscloud.net. 56 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0