I have a simple table that has a field called nTagno. The field is an inventory tag number. I need to know if any of the nTagno numbers are missing. For example, My tags are numbered 1000-1250 and the table is the records with tags 1101 through 1105. I was trying to find a way to show that those tags are missing. Either with a report or query. The tag numbers are sequential but I just don't have a process for finding the missing tag numbers. Any suggestions?