Blog · Networking
Why does my public IP address change?
Short answer: Most ISPs give you a dynamic public IP from a shared pool. When your lease refreshes, you reconnect, or you move networks, the address you show to the internet can change. What Is My IP Address IP always shows whatever is current for this browser session—use Refresh after switching Wi‑Fi or VPN.
Common reasons it changes
- DHCP lease renewal — your ISP reassigns an address from its pool on a schedule or after downtime.
- Modem/router reboot — a new session often gets a new public IP on consumer lines.
- Mobile data — towers and sessions shift; the visible IP can change as you move.
- VPN on or off — with VPN you see the provider’s exit IP, not your home ISP.
When it usually stays stable
On a fixed home connection without VPN, your public IP may stay the same for days or weeks—but it is not guaranteed unless you have a static IP product from your provider.