OIT Networking & Monitoring Services

Current Temporary Unregistered Dormnet IP Address Assignments

NOTE: TUD IP Address Service was retired June 11 2018 as described here.

This is a list of the current Temporary Unregistered Dormnet IP address assignments made by the OIT DHCP servers. For general information about Temporary Unregistered Dormnet (TUD) IP addresses, see Temporary Unregistered Dormnet IP Address Service.

See the How to Interpret This Table section at the end of this document for information to help you interpret this data.

When Was This Document Updated?

This document is updated several times each hour; this one was produced at 9:46:03 pm Sun Jun 24 2018. It is based upon snapshots from the following OIT DHCP servers:

It typically takes up to 10 minutes for a new DHCP lease (or the renewal or expiration of an old DHCP lease) to be reflected below.

No Temporary Unregistered Dormnet IP addresses are currently assigned.

How to Interpret This Table

The table above shows all the leases for Temporary Unregistered Dormnet IP Addresses that have not yet expired. If all TUD IP Address leases have expired, no table will appear above.

Each row of the table describes a single Temporary Unregistered Dormnet IP address assignment (a.k.a "lease"). At the end of the table is the number of Temporary Unregistered Dormnet IP addresses currently assigned to customers, along with the total number of allocated.

Only Temporary Unregistered Dormnet IP address assignments appear in this document. Assignments of static IP addresses and Mobile IP Addresses do not appear.

If an OIT DHCP server is down (e.g. for planned maintenance or due to a failure), the most recent snapshot from it may not be "recent". You can judge for yourself how recent the data is by checking the section above entitled When Was This Document Updated. Snapshots that are "too old" are excluded from this document.

If no recent snapshot is available from a DHCP server, this document will not reflect the assignments granted by that server; assignments granted by other servers will still appear.

A device that has become ineligible for TUD may continue to appear in this document for several hours after becoming ineligible, until its final lease expires.

If a client obtains a lease on a TUD IP Address from one DHCP server, then before that lease expires, the client obtains a lease on another TUD IP Address from a different DHCP server, the client may appear above more than once.

Columns in Each Table

Client's Hardware Address
This is the hardware (e.g. Ethernet or Wireless) address of the client's device.

Temporary Unregistered Dormnet IP Address and Hostname
The Temporary Unregistered Dormnet IP address that has been temporarily assigned to this client, as well as the Internet Hostname associated with this temporary IP address. (Only the first part of the hostname appears; the trailing ".Princeton.EDU" does not appear here.)

TUD Service First Began
The date and time when this client first began receiving Temporary Unregistered Dormnet IP Address service. You can use this to help determine if the length of the client's visit is approaching the limit at which it will be declared a TUD Camper (7 days during most of the year; 14 days during the first eight weeks of Academic Year Dormnet Billing Period).

As described in Temporary Unregistered Dormnet IP Address Service, TUD service is deemed to have ended when any of the following is true: the client is subscribed to Dormnet, the client is registered in the Host Database as an office machine, the client is absent from the Dormnet network for six or more days, or the client is declared a TUD Camper.

Lease Duration and Expiration Time
The length of this Temporary Unregistered Dormnet IP address assignment (a.k.a. "lease"), and when it expires.

If the client device remains attached to the same network, continues to use IP, and has correctly-working DHCP software, then before the lease expires the client will automatically attempt to renew (extend) its lease from the OIT DHCP server that granted the lease.

DHCP Server
The name of the OIT DHCP server that granted this lease.

OIT operates several DHCP servers to provide a measure of redundancy. Any of these servers can provide a new lease to a client; once a client has obtained a lease on a Temporary Unregistered Dormnet IP address, only the server that originally granted that lease can grant a renewal on it; the DHCP client is bound to this server.

Each DHCP server maintains its state across reboots or other failures; when the DHCP server restarts, any unexpired leases are still valid.

Because a DHCP client typically attempts to renew its lease halfway through its duration and will retry in the background until it succeeds or the lease expires, the client is not affected by a brief outage of the DHCP server to which it is bound. If a client is unable to renew its lease before it expires, the client loses the IP address, and must go through a discovery process to obtain a new one from any DHCP server (behavior on specific client platforms may vary).

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The Office of Information Technology,
Princeton University