What is a public IP address
Every device on the internet has an address that servers send their replies to. At home or in the office, all devices usually go online through a router under one shared address — that’s the one websites see and this page shows. Addresses like 192.168.x.x or 10.x.x.x only work inside your local network.
When you need to know your IP
- To allow access to a server, database or control panel only from your address.
- To set up remote access to home or office equipment.
- To check that your VPN works: after connecting, the address and country should change.
- When support asks for it — to find your requests in server logs.
Why your address changes
Most ISPs give home subscribers a dynamic address that changes after a router reboot or on a schedule. Mobile carriers often use CGNAT — one public address shared by many subscribers. If you need a permanent address, order a static IP from your ISP or host your service on a VPS with a dedicated address.