I have to provide network securitiy the name to over 10000 IPs. Wouldn't be that big of a deal except I have been with this organization less than a month. Anyone know of a way to do bulk IP lookups?

You can use IPCONFIG, NBTSTAT to get these info. Or use a network or subnet scanner. Ping –a 10.1.1.1 will give you the name If you have IP address in a text file, you can use a batch file to get the result. Here is an example: FOR /f %%i in (C:\IP.txt) do ( Ping –a %%I –n 1 >>output.txt ) Or export the DNS zone info. Or from WINSSanthosh Sivarajan | MCTS, MCSE (W2K3/W2K/NT4), MCSA (W2K3/W2K/MSG), CCNA, Network+| Houston, TX Blogs - http://blogs.sivarajan.com/ This posting is provided AS IS with no warranties,and confers no rights.

If your DNS infrastruture is configure to allow clients to dynamically update their records AND your DNS servers host a Reverse Lookup Zone, the information may already be available to you. Otherwise, a good network scanner can provide that information. Here is a good free tool... http://www.solarwinds.com/products/freetools/ip-address-tracker/ Visit anITKB.com, an IT Knowledge Base.