What do IP addresses look like?
All IP addresses are made up of four sets of numbers separated by a dot. (E.g. 123.123.123.123). The maximum number in any of the sets of four is 255, so a typical range of IP addresses is written to look like 123.123.123.1-255 which would include all the numbers where the last number is between 1 and 255. A common shorthand for a complete range (where the range is 1-255) is to write * instead of 1-255. This * is interpreted as a wildcard and the computer will accept any number in that range. Often they look like this 243.3.182. *; they can also be shortened like this 83.18.*.*, which is a shorthand for 83.18.1-255.1-255.
