Summary: How to to build a Smart label by building a Regex expression for an IP range
Example: To find all systems with IPs in the range 192.168.2.2 - 192.168.2.100.
1. Use this URL and fill in the ip address and build the expression automatically in the expression builder: http://www.analyticsmarket.com/freetools/ipregex
REGEX Expression: ^192\.168\.2\.([2-9]|[1-9][0-9]|100)$
2. Create the smart label with IP address Matches Regex Test and then save the label.
3. Then go the SQL of the label and replace with the REGEX expression from the tool above.