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I can look into my Windows 2003 DHCP <br />
server's C:\....\system32\dhcp\Dhcp<wbr />SrvLog.xxx<wbr /> <br />
to find out who had IP address 192.168.24.55 <br />
five days ago<br />
<br />
What software can I get to keep <br />
a 90 day history of IP assignments ?
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I can look into my Windows 2003 DHCP 
server's C:\....\system32\dhcp\DhcpSrvLog.xxx 
to find out who had IP address 192.168.24.55 
five days ago

What software can I get to keep 
a 90 day history of IP assignments ?

DHCP -- IP address history ?

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).

DHCP

Transmission Control Protocol/Internet Protocol (TCP/IP) is the set of networking protocols that define end-to-end connectivity specifying how data should be packeted, addressed, transmitted, routed and received at the destination. This functionality is organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.

TCP/IP

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).