Do you run Docker? Because I remember having to VPN out to a client that used that range, and it caused conflicts where our docker containers couldn't reach the client side to fetch data.

Docker defaults to 172.16.0.0/16.

My (very large) corporate network uses 172.16 and 10. heavily, which has lead me to set my docker/daemon.json default-address-pools to 84.54.64.0/18, as it's very unlikely we need to communicate with any IPs in Uzbekistan.

I often use 172.31/16 for subnets and have never seen a conflict. I have seen 172.24 and 172.16 used before, though.

I find a lot of Docker containers using subnets inside 172.16.0.0/16.