IP address problem with VM again

Hi all,

For openvz we can check what VPS using IP via command vzlist -a but how about VM ?

We provide IP 192.168.1.1 for VM A but VM A will manual set more IP .2 and .3 and goes on...

In the case we have more than 1000 VM in proxmox system so how to recognize what VM using these IP ?

Thanks,