Sometimes I receive calls from people who do not leave a voicemail or text message.  Once in a while, the call is repeated with the same behavior.  When this happens, I wonder about who is trying to reach me.  To do this, I use reverse phone number lookup tools online.  Unfortunately, a LOT of these tools feel scammy and/or want to be paid for the information.  After trying out a bunch, I came across two that appeared to work somewhat well:

Turns out the person who is trying to reach me appears to be an Executive Recruiter – seems to make sense why a message is not being left.