How accurate is the IP address, and to what extent is the IP address accurate

At present, the domestic IP varies from operator to operator, and traditional Internet providers such as China Telecom Unicom are accurate to the district-level administrative area, and then determine the specific positioning according to the history of Internet access to IP and the declared address. Operators that lease lines or allocate intranet IPs such as mobile radio and television are generally only accurate to the provincial level and dynamically allocated within the province.

At present, the accuracy and coverage of international and domestic provincial and municipal databases rank first among similar databases in China. The IP database is collected by professional and technical personnel through a variety of technical means for a long time, and has been updated and supplemented by professionals for a long time.

1.IP city-level database: You can query all domestic IP segments, accurate to prefecture-level cities (some fixed IPs are accurate to districts and counties). International precision down to the country (i.e. IP national database).

2.IP country database: You can query the IP range of each country in the world, accurate to the specific country, and cannot find deeper provinces and cities.

3.IP provincial database (no ISP): You can query the domestic IP range, accurate to the province. (There are individual data that can only be determined to be domestic, not to the province.) Including Hong Kong, Macao and Taiwan).

4.Provincial IP address database (including ISP): Based on the provincial IP database, you can further query the ISP information to which the IP address belongs. (Only the province can be queried, and the ISP information of some IPs cannot be determined).

5.Provincial custom IP database: You can query the IP range of a province in China, accurate to the prefecture-level city. Each province is one unit and is sold by province. (You can query the ISP information of these IP addresses).

6.ISP Custom IP Address Database: You can query the IP address range under the jurisdiction of an ISP. Each ISP is one unit and is sold as an ISP. Provincial and municipal information cannot be found.

7.Domestic IP Database (Mainland China): You can query all domestic IP segments, but cannot be accurate to deeper provinces, cities, and ISPs. It does not include Hong Kong, Macao and Taiwan.

The subnet mask is used to determine whether the IP addresses of any two computers belong to the same subnet.

The simplest understanding is that after the IP address and subnet mask of the two computers are AND, if the result is the same, it means that the two computers are on the same subnetwork and can communicate directly. It's as simple as that.

Take a look at the following example:

Arithmetic Demo 1: AA

ip address.

Subnet mask. and operation (and algorithm: 1 and 1 = 1 , 1 and 0 = 0 , 0 and 1 = 0 , 0 and 0 = 0 , that is, when the corresponding bits are all 1, the result is 1, and the rest is 0. )

Convert to binary for arithmetic:

ip address.

Subnet mask. and operations.

When converted to decimal, it is:

Calculation Demonstration 2:

ip address.

Subnet mask. and operations.

Convert to binary for arithmetic:

ip address.

Subnet mask. and operations.

When converted to decimal, it is:

Calculation Demonstration 3:

ip address.

Subnet mask. and operations.

Convert to binary for arithmetic:

ip address.

Subnet mask. and operations.

When converted to decimal, it is:

Through the above AND operation of the IP address and subnet mask of the three sets of computers, we can see that the result of the operation is the same. Both.

First you have to figure out the definition of IP:

IP is equivalent to the address of your computer, for example, if you chat QQ, others need to know your IP to send you a message, of course, you don't have these processes when you use QQ, because when you click out of the chat window between you and your friend, Tencent's server tells your computer, what is your friend's IP, and then you send a message directly to your friend's IP, if there is no IP, it can't be sent to you, just like a package without an address, how to find you? This is what IP does, and the IP is unique to each computer.

Our ADSL is that you dial once, change an IP, that is to say, you turn off the modem, and then turn on, click on the computer to dial to connect, this is an IP, whether you close the web page, or close the browser, you are this IP, and then you turn off the modem, redial, and another IP

**are all fixed IPs, their IPs will not change, your IP cannot be controlled by**, your IP allocation is dependent on the network service provider.