The first character is an asterisk(*). In this instance the asterisk (*) 'wildcard' represents the entire range of numbers for that block of the IP number. For example, 10.10.*.*
The second 'wildcard' character is a question mark (?). The question mark (?) represents a single digit in the IP number. For example, 192.168.0.1??
Constraints for the IP numbers in the list: -Any block of the IP number must begin with a digit or have a single asterisk (*) in the block. For example, 10.10.0*.01 is invalid and 255.10.?0.1 is invalid -The entire IP number cannot begin with an asterisk (*) or question mark (?). For example, *.10.0.01 is invalid and ?55.10.10.1 is invalid.