什么是 IP 地址？
IP 地址（Internet Protocol address）是分配给网络上每一台设备的唯一编号，作用类似于收件的门牌号--它让数据能够准确找到往返的目标设备。没有 IP 地址，设备便无法在互联网上收发信息。
IPv4 与 IPv6
目前主要有两个版本的 IP 协议：
- IPv4：32 位地址，形如
192.0.2.1，总共约 43 亿个。由于互联网爆发式增长，IPv4 地址已基本耗尽。 - IPv6：128 位地址，形如
2001:db8::1，数量近乎无限，旨在取代 IPv4。
IP 地址是如何分配的
当你连接网络时，运营商（ISP）会为你的路由器分配一个公网 IP；路由器再通过 DHCP 为家中每台设备分配内网 IP。网站看到的是你的公网 IP，而内网 IP 不会出现在公网上。
如何查看我的 IP
访问 IP Lookup，页面会自动显示你的公网 IPv4 与 IPv6 地址，无需任何操作。
What is an IP Address?
An IP address (Internet Protocol address) is a unique number assigned to every device on a network. It works like a postal address for data--letting information find the right device to and from. Without an IP address, a device cannot send or receive anything on the internet.
IPv4 and IPv6
Two versions of the IP protocol are in use today:
- IPv4: 32-bit addresses like
192.0.2.1, about 4.3 billion in total. IPv4 addresses have effectively run out due to the internet's explosive growth. - IPv6: 128-bit addresses like
2001:db8::1, virtually unlimited, designed to replace IPv4.
How IP Addresses Are Assigned
When you connect, your Internet Service Provider (ISP) assigns a public IP to your router. The router then uses DHCP to give each of your devices a private IP. Websites see your public IP; private IPs never appear on the public internet.
How to Find My IP
Visit IP Lookup and the page automatically shows your public IPv4 and IPv6 addresses--no action required.