What is a domain name?
In the digital world, IP addresses are the only way for computers to locate each other. They consist of a series of complex numbers, such as “192.0.2.1.” However, it is extremely difficult and impractical for humans to remember these numerical sequences. The invention of domain names was precisely to address this issue. A domain name is a naming system that maps easy-to-remember and easy-to-write characters (such as “example.com”) to the corresponding server IP addresses.
Domain names essentially serve as both “house numbers” and “brand identifiers” on the internet. From a technical perspective, they follow a hierarchical structure that is read from right to left. The far-right part of a domain name is the top-level domain (TLD), such as “.com”, “.cn”, or “.org”. Immediately to its left is the second-level domain, which is usually the brand or name of the website chosen by the registrant, for example “google” or “baidu”. The existence of domain names allows us to access websites and send emails without having to enter complex IP addresses; we simply need to provide a simple name.
Domain name registration process
Having a domain name is the first step in establishing an online identity. Registering a domain name is not a complicated technical process, but it is crucial to understand the process and the key decision points involved.
Recommended Reading Comprehensive Domain Name Analysis: A Practical Guide and Best Practices from Registration, Resolution to Management。
Selecting a domain name and a registrar
The process begins with selecting an ideal domain name. A good domain name is usually short, easy to remember, and relevant to your brand or business. It’s also advisable to avoid using hyphens and numbers to reduce the chances of confusion. Next, you need to choose a domain name registrar from the many available companies that provide domain registration services. Registrars are authorized to offer these services and will check the availability of the domain name you’ve selected, as well as guide you through the subsequent steps.
Purchase and Real-name Authentication
Once you confirm that the domain name is available, you proceed to the purchase phase. You need to choose the duration of registration, which can usually be either one year or multiple years. You will also be required to provide accurate registration information. According to Chinese national regulations (as well as those of many other countries), domain name registration requires identity verification. This means you must submit personal or corporate identification documents (such as a ID card or business license) to the registrar for verification. The domain name will only become officially valid and be registered in your name after the identity verification is completed.
Set up a domain name server
During the registration process, a crucial yet often overlooked step is setting up the domain name servers. Domain name servers (usually provided by the registrar or your hosting service provider) are the authoritative servers that store all the resolution records for your domain name. At this stage, you generally only need to use the default DNS server addresses provided by the registrar; subsequent management of domain name resolution will be carried out on these servers.
The principle of domain name resolution
Registering a domain name simply means owning a name; however, domain name resolution is the critical technical process that associates this name with a specific network location (such as a website server). The entire process is distributed and hierarchical in nature.
The hierarchical structure of the DNS system
The entire Domain Name System (DNS) is a vast, globally distributed database. When you enter a website address in your browser, your computer first sends a request to the recursive DNS server configured locally (usually provided by your internet service provider). If the recursive server does not have the relevant information in its cache, it starts the search from the root DNS server and proceeds level by level, until it finds the authoritative DNS server that manages the specific domain name, and then obtains the corresponding IP address.
Recommended Reading What is a domain name? A comprehensive guide from registration, resolution to management.。
\nCore analysis record type
On authoritative DNS servers, domain names are mapped to different services using various types of records, which are the core of the resolution process:
- A记录：将域名指向一个IPv4地址，这是访问网站最常用的记录。
- CNAME记录：将一个域名别名指向另一个域名，而不是直接的IP地址。例如，将“www.example.com”指向“example.com”。
- MX record: Specifies the address of the mail server that receives emails for this domain name.
- TXT记录：通常用于存放一些验证信息，如域名所有权验证（用于SSL证书申请）或邮件安全策略（SPF, DMARC）。
Analyze the effectiveness of DNS and TTL
After you modify a DNS record, recursive DNS servers around the world do not update it immediately. Each record has a “Time To Live” (TTL) value, which specifies how long other DNS servers can cache that record (in seconds). Setting a shorter TTL value can speed up the propagation of changes, but it increases the load on the DNS system; a longer TTL value improves the resolution speed, however the changes will take longer to become effective.
Daily management of domain names
Domain name registration is not a one-time solution; effective daily management is essential to ensure its security, stability, and continuous availability.
Information Maintenance and Renewal Management
You must ensure that the email addresses of the registrant, administrators, technical personnel, and billing contacts are accurate and valid. These addresses are crucial for receiving important notifications, such as renewal reminders and authorization code transfers. Domain names need to be renewed regularly, usually on an annual basis. Make sure to pay attention to the renewal reminders sent by your registrar and set up automatic renewal to avoid domain name expiration and deletion due to forgotten renewals. This could result in the domain name being registered by someone else, causing irreparable losses.
Security and Privacy Protection
Domain name security is of utmost importance. The top priority is to keep your registrar account password secure and enable two-factor authentication. Next, make sure the “registrant email” associated with your domain name is protected, as it is the primary method for resetting passwords and receiving confirmation emails for domain name transfers. For users who do not want to make their personal registration information public, you can consider using the “WHOIS privacy protection” service provided by your registrar (although this option may not be available for all top-level domains). Additionally, regularly review your DNS records to prevent any malicious alterations.
Filing and domestic use
If you plan to use a server in mainland China to provide website services, you are required to apply for ICP (Internet Content Provider) registration for your domain name according to the regulations of the relevant authorities. The entity responsible for the registration (either an individual or a company) must match the information provided during the domain name’s identity verification process. The registration application must be submitted through your server provider in mainland China. Only after the application is approved and you receive the registration number can your website be accessed normally.
Recommended Reading Interpretation of Domain Names: A Comprehensive Guide from Registration to Resolution, along with SEO Optimization Strategies。
summarize
域名是互联网基础设施的基石，它将人类可读的名称与机器识别的IP地址连接起来。从选择并完成注册与实名认证，到理解DNS解析的层级原理并设置正确的解析记录，再到日常的维护、续费和安全防护，构成了域名生命周期的完整闭环。无论是个人博客还是企业官网，掌握域名从注册、解析到管理的全链路知识，都是建立稳固在线身份的首要且关键的一步。
FAQ Frequently Asked Questions
Can the domain name be used immediately after registration?
Once you complete the registration and real-name verification process, the domain name becomes your property. However, to use it for accessing a website or an email account, you still need to set the correct resolution records (such as A records and MX records) in the DNS management panel. The changes will only take effect after the global DNS cache is updated, which typically takes a few minutes to several hours.
Do all domain names require real-name authentication?
Yes, according to the regulations of the global internet domain name management organizations and the China Internet Network Information Center, the registration of the vast majority of generic top-level domains (gTLDs) and country-code top-level domains (ccTLDs) currently requires real-name verification. Domains that do not pass the real-name verification process will have their resolution suspended and will not be able to be used normally.
What should the TTL value be set to in a DNS resolution record?
对于稳定不变的业务，可以设置较长的TTL值，例如14400秒（4小时）或更长，以减少DNS查询压力并提升访问速度。如果你计划近期变更服务器IP或进行迁移，建议提前将TTL值调短，例如300秒（5分钟），以便变更能快速生效，变更完成后再调回长值。
How long after a domain name expires can it be re-registered?
域名过期后通常会经历三个阶段：续费宽限期（约30天，可按原价续费）、高价赎回期（约30天，需支付高昂赎回费）、以及等待删除期（约5天）。只有在域名被彻底删除并释放回公共注册池后，其他用户才能重新注册。具体时长因注册商和顶级域名政策而异。
What's next, what's next?
Extended reading and practical knowledge
The following are related to the topic of this article and are suitable for further in-depth reading. Prioritize starting with the article that is closest to your current problem, and gradually expanding to surrounding topics usually works better.
- How to Choose, Register, and Optimize Your Domain Name: A Complete Guide from Beginner to Expert
- What is a domain name? A comprehensive guide for beginners to experts, from registration to resolution.
- Domain Name Full Resolution: A Comprehensive Practical Guide from Registration, Configuration to Management
- What is a domain name? A comprehensive explanation of its definition, types, and common questions.
- What is a domain name? A comprehensive guide for beginners on purchasing and configuring domain names.
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