185.209.152.107.in-addr.arpa.
Question and response
Question
dig smtp-uk-mm01.concentrix.com. PTR
Answer
smtp-uk-mm01.concentrix.com. 300 PTR 185.209.152.107.in-addr.arpa.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0