What special IP addresses have special uses?

Everyone is an independent IP address when surfing the Internet, so people rarely pay attention to the special IP address, thinking that this is a random selection of the system, in fact, there are many special The IP addresses are somewhat different. Let's introduce these special IP addresses and special features to you today.

I.127.0.0.1

127 is a reserved address, which refers to the computer itself. Its main function is to reserve it for testing. It is used for network software testing and local machine process. Communication. In the Windows system, the address also has an alias called "localhost"; no matter which program, once the address is used to send data, the protocol software will return immediately without any network transmission, unless there is an error, the packet containing the network number It can't appear on any network.

2,10.*.*.*,172.16.*.*-172.31.*.*,192.168.*.*

The above three network segments are private addresses, you can It is used for its own network. These addresses are mainly used in the internal network of the enterprise, but they cannot be used on the Internet. The Internet does not have routes for these addresses. Computers that use these three network segments must pass the address translation. NAT) translates private addresses into public legal IP addresses. Some bandwidth routers or other network devices often use 192.168.1.1 as the default address. Since the private personal network is not interconnected with the outside world, you can use random IP addresses and keep the IP addresses of these three network segments. Its use is to avoid address confusion when accessing the public network in the future.

Third, 0.0.0.0

Strictly speaking, 0.0.0.0 is not really an ip address. It represents such a collection, all unclear host and destination networks. The unclear here means that there is no specific entry in the routing table of the machine to indicate how to arrive. For this machine, it is a shelter, and all three people who are not known will be sent in. If you set the default gateway in the network settings, the windows system will automatically generate a default route with a destination address of 0.0.0.0.

4, 255.255.255.255

Restricted broadcast address, for this machine, this address refers to all hosts in the network segment (same broadcast domain), this address is used for the host The destination address of the IP packet during the configuration process. At this time, the host may not know the network mask of the network it is on, and even its IP address is unknown. In any case, the router will not forward packets destined for a restricted broadcast address, such packets will only appear on the local network.

5, 224.0.0.0— 239.255.255.255

This is a set of multicast addresses, need to pay attention to the difference between it and the broadcast address, of which 224.0.0.1 refers to all hosts, 224.0 .0.2 refers to all routers, 224.0.0.5 refers to all OSPF router addresses, and 224.0.0.13 refers to the address of the PIMV2 router. In addition, from 224.0.0.0 - 224.0.0.255 can only be used for routers in the LAN will not forward, 239.0.0.0 - 239.255.255.255 is a private address (the same function as 192.168. *. *), 224.0.0.10 mdash; 238.255.255.255 can be used on the Internet. If your host has the IRDp (Internet Routing Discovery Protocol, Multicast feature) feature enabled, there should be such a route in your host routing table.

VI, 169.254.*.*

If your host uses the DHCP function to automatically obtain an ip address, then your DHCP server fails or the response time is too long and exceeds the system requirements. One time, the windows system will assign you such an address. If you find that your host ip address is an address like this, unfortunately, in all likelihood, your network is not working properly.

A total of six sets of IP addresses have been sorted out. I don't know if you have the patience to read them. I don't understand the original IP address and these fun uses. Today I know that I can use it later. You can choose Write down the sex and hope to be useful to you.