When viewing Concourse Worker VMs in vSphere, you may see that they display multiple IP addresses. One of these will be a normal IP for the network concourse is deployed on, while the other will be in a 10.80.0.0/16 format. This can cause some confusion, as other VMs in the deployment do not do this.
All Concourse Versions
This is expected behaviour for Concourse Workers. The IP range 10.80.0.0/16 is the container network used for running jobs on the concourse workers.
https://concourse-ci.org/concourse-worker.html
This results in the IPs used by the containers being displayed under the worker VM. This does not impact the VMs at all.