Everyone must have seen the description of IP addresses on TV or movies. For example, a hacker obtained the IP address of the victim and launched an attack on it, and the police arrested the suspect based on the IP address of the criminal suspect, etc.

So what exactly is an IP address? Why is it so important? Why is it so powerful?

IP is the abbreviation of Internet Protocol (Internet Protocol), which is a protocol of computer network, and IP address is a rule or a set of definitions in this protocol.

It is similar to the encoding method of an address and house number in our real life. For example, your home is No. XX, XX Street, XXX Guangzhou Avenue, and the opposite is No. XX, XXX Street.

The IP address is an address used to encode on the computer network. When we surf the Internet on the computer and use the mobile phone to surf the Internet, it is because we have an IP address. If we do not have an IP address, we cannot surf the Internet. .

The courier must know your home address to deliver the courier to you. The same is true for us browsing the web and playing games. We must have an IP address before data can be sent to your local browser and game client.

The routers and switches in the middle act as couriers, transmitting binary data one by one to your computer.

Like your home address, an IP address is globally unique, and it is impossible for 2 identical home addresses to exist, nor for 2 identical IP addresses.

Some people may say that I see that my IP address is 192.168.1.3, and that of others is also 192.168.1.3. Please remember that IP addresses are also divided into public addresses and private addresses, of which public addresses are globally unique.

The private address is unique in your local area network. Most of the time, our computers are inside and outside. For example, if you are in the company's computer, it is in the company's local area network. The internal network address may be 192.68.1.X, and the Internet When using the same public network address of the company, a technology called NAT technology is used to convert the IP of the internal network to the IP of the external network. I will not describe too much here. Interested students, please pay attention to me! Follow-up articles will be explain.

So what are our private addresses?

Private addresses are divided into 3 categories:

• Class A address: 10.0.0.0------10.255.255.255
• Class B address: 172.16.0.0----172.31.255.255
• Class C address: 192.168.0.0---192.168.255.255

That is to say, these addresses can be reused in different LANs. For example, your IP address in company A is 172.16.1.5, and maybe your IP address in company B is 172.16.1.5.

Why can you be found by IP address?

No one is safe on the Internet. I believe everyone has heard the phrase "the Internet is not a place outside the law". Many netizens publish rumors and promote rumors on the Internet. In fact, the police can easily find you. Why?

Because every rumor you publish has an IP address, such as an Internet cafe, home, company, or even abroad. No matter where you are, the police can easily locate you.

Think about it, do you usually have an Internet account when you surf the Internet? Is your Internet account registered with your real name? When the telecom or China Unicom operator assigns you an Internet account, it has already assigned you an IP address. At this time Your account has been bound to this IP address. No matter what tool you use to surf the Internet, this IP address is used to communicate with the outside world.

Some people will say, I am using a mobile phone and don't have an Internet account, then you are naive.

Isn't your phone card real name?

Similarly, mobile phone cards and phone cards are bound to an IP address when accessing the Internet. When opening a card in an Internet cafe, you also need to swipe your ID card. The IP address is also bound to your Internet account. Although the Internet cafe may be an intranet address, the same The public address has a mapping relationship, and each data can be located to which computer.

Nowadays, many public WIFIs, such as the WIFI in shopping malls, need to enter your phone number for verification before they can access the Internet. Why? It is just to identify you. You think that if you connect to the public WIFI, no one will find you. ?

As long as you have access to the Internet, you must have an IP address. Wondering how hackers hide themselves? Follow me for follow-up articles.

When others know your IP address, they can find your hometown just like others know your home address.

So remind all netizens, don't post illegal things on the Internet, the police are watching you every minute?

In addition, on April 15th, Douyin, Toutiao, Kuaishou, Zhihu, Baijiahao and other platforms announced that they will launch the function of displaying the user's IP location. Although the specific IP address is not displayed, this location can already be used. Exposed most people.

It means that in the future, everyone can see the approximate location of your address, and which city and district you can go to. At that time, the whole network is watching you.

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