There are differences between IP class ranges because some networks require many hosts and some only a few. The three main classes are A$,$B$,$ and C$.$ Class A is designated for is large networks. Class C is for smaller mostly private networks. Class B is the middle ground for medium sized networks. Class A networks are identified by the first byte being between $0$ and $127.$ An example is $49\mathrm{.}22\mathrm{.}102\mathrm{.}70.$ Class B networks are identified with first byte ranging from $128$ to $191$ as is $154\mathrm{.}16\mathrm{.}30\mathrm{.}56.$ Class C networks are classified with the numbers $192$ to $223$ as in $194\mathrm{.}168\mathrm{.}100\mathrm{.}255.$ Class D are multicast networks and range from $224$ through $239$ and Class E for scientific purposes with ranges from $240$ through $255.$

Understanding IP addressing can help with troubleshooting because it allows you to know how large of a network you are dealing with. It also allows you to know which devices based on the host address is the one or ones needing attention. If you know what size network you are working with you can decide whether or not to try fixing the individual device or if you should start with something such as a router or switch.