I need someone to answer this question for me, preferably someone from MT. We have a subpoena from the authorities investigating a customer and they want to know information on who an IP address belongs to. We are a small wisp and have no history tracking in place. The date in question is 10 days ago and our dhcp server is setup with a 7 day lease. I know from experience that MT will always re-hand out the same IP each time, but since there is a small chance this IP was being used by another customer I need to know specifically how the dhcp release and renew works. If the MT lease expires how long will the MT hold that address in memory before allocating it to someone else? I ask this because I've seen leases expire before and modules will still get the same IP again, so is that a coincidence or is there a period of time that the router will store that information? Also the subscriber in this case is a Canopy module which does not log dhcp client renew information, if this had been a MT subscriber this probably would have been easier.