NXDOMAIN Error

[Barry Finkel]

I am seeing many messages such as this one

     named[5172]: sysquery: findns error (NXDOMAIN) on barge.mcs.anl.gov?

in my BIND 8.2.2-p5 log file on dns1.anl.gov.  I assume it means that 
someone is querying our dns1 name server, and looking for an entry for

     barge.mcs.anl.gov

The barge machine was the NS for an old domain 

     ucsp.anl.gov

that I removed from dns earlier this year, and the barge machine no
longer exists in DNS.  How do I determine who is making these queries?  
Thanks.
----------------------------------------------------------------------
Barry S. Finkel
Electronics and Computing Technologies Division
Argonne National Laboratory          Phone:    +1 (630) 252-7277
9700 South Cass Avenue               Facsimile:+1 (630) 252-9689
Building 221, Room B236              Internet: BSFinkel at anl.gov
Argonne, IL   60439-4844             IBMMAIL:  I1004994