OIT Networking & Monitoring Services

Current Temporary Visitor Wireless Network Access (TVWNA) IP Address Assignments

Changes made to visitor wireless access on March 21 2013 prevent us from identifying devices using that service. As a result, use of the service after the morning of March 21 2013 does not appear below.

This is a list of the current Temporary Visitor Wireless Network Access (TVWNA) IP address assignments made by the OIT DHCP servers. For general information about TVWNA, see Temporary Visitor Wireless Network Access.

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 9:16:03 am Mon Sep 25 2017. 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 Visitor Wireless Network Access IP addresses are currently assigned.



How to Interpret This Table

The table above shows all the leases for Temporary Visitor Wireless Network Access IP Addresses that have not yet expired. If all TVWNA IP address leases have expired, no table will appear above.

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

Only TVWNA IP address assignments appear in this document. Assignments of static IP addresses, Mobile IP Addresses, TUD IP Addresses, and Visitor IP Addresses (VIP), 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 TVWNA 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 TVWNA IP Address from one DHCP server, then before that lease expires, the client obtains a lease on another TVWNA IP Address from a different DHCP server, the client may appear above more than once.

Columns in the Table

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

TVWNA IP Address and Hostname
The TVWNA IP address that has been temporarily assigned to this client, as well as the Internet Hostname associated with this IP address.

Recent TVWNA Usage Dates
The dates (during the current month) on which this client received TVWNA service.

Lease Duration and Expiration Time
The length of this TVWNA 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 TVWNA 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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