I see multiple utun interfaces from the ifconfig command output.
I know utun0 and utun1 are system interfaces. utun2 is the tunnel interface for my vpn client. But I can’t find out which application is creating utun3-6 interfaces. I also don’t see them in netsts -rn output.

According to this thread on the Apple developer forum, you should be able to get this information by running:

ifconfig -v utun3 | grep "agent domain"

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