![]() This is often the lowest or highest non-reserved address. Each allocation will also have an address for a router. The size of the allocation is always a power of 2 and the lowest and highest address in each allocation are reserved. Later the strict usage of these masks was dropped and address allocation were done in a variety of sizes. These classes had masks of 8, 16, and 24 bits respectively. The A class made up the first half of the address range, the B range the next quarter, and the C range the next eight of the range. This makes routing to 192.168.100.0/24 work when there is a route for 192.168.0.0/16 and another for 0.0.0.0/0 (default route).ĮDIT: Originally, the IP range was broken into several classes A, B, and C being the most significant. Routes are searched in reverse order in to the number of one bits in their mask. Many of these can be aggregated like 172.16.0.0/12 and 192.168.0.0/16 further reducing the routing table size. ![]() Routing to the Internet for IP is a single entry 0.0.0.0/0. Routing tables for MAC addresses would need almost every single device with a MAC address listed. You have a State Issued ID Number, why would you need a mailing address if that ID number is already unique to just you? You need the mailing address because it's an arbitrary system that describes where the unique destination for communications to you should go. It's also pretty easy to relate this to another pair of systems. From there, Apple will know where each of its thousands of subnets are located and how to get to them (nobody else needs to know this information, they just need to know that 17.anything goes to Apple). For instance, 17.x.x.x is within the Apple network. Sending messages between those groups is done by routing tables, themselves divided into multiple levels so that we don't have to keep track of every single subnet. IP is an arbitrary numbering scheme imposed in a hierarchical fashion on a group of computers to logically distinguish them as a group (that's what a subnet is). To check this, run the following command in the Terminal and verify the network adapter for which you want to change the MAC address.The MAC address might be unique, but there's nothing special about the number that would indicate where it is. Some Macs may use "en1" instead of "en0".Make sure to use an administrator account to perform the procedure.It might be a good idea to note down your existing MAC addresses in case something goes wrong. ![]() If you still experience problems, just reboot your Mac to reset the MAC address. ![]()
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