Guides · Your public IP address
Static vs Dynamic IP: Why Your Public IP Changes
Learn the difference between static and dynamic IP addresses, why your IP changes, when a static address helps, and how to change it safely.
A dynamic IP can change when your provider reassigns addresses, while a static IP is configured or reserved to remain consistent. Most home and mobile connections use dynamic addressing. That is normally enough for browsing, streaming and everyday work, and a changing address does not indicate a fault by itself.
How dynamic address assignment works
Providers commonly assign addresses using DHCP or related mechanisms for a period called a lease. Reconnecting, replacing a router, changing the MAC address presented to the provider or waiting for a lease event may lead to a different address.
It may also remain unchanged for months. Dynamic does not mean it changes every day, and reconnecting never guarantees a new IP. Mobile networks and CGNAT add further sharing and reassignment.
When a static IP is useful
A static public IP can simplify allowlists for business systems, certain servers, remote access and network configurations where a fixed source is required. Providers may charge extra or offer it only on business plans.
Static addressing does not automatically improve speed, privacy or security. A fixed address can be easier to associate over time, and any listening service still needs patches, firewall rules and strong authentication. For many remote-access needs, a maintained VPN or overlay network avoids a static public IP.
Public static IP versus local DHCP reservation
These are separate settings. A static public IP concerns the address visible on the internet and usually requires your provider. A DHCP reservation in your router keeps a device's private local address consistent, such as assigning 192.168.1.50 to a printer.
Manually choosing a local static address without checking subnet and DHCP ranges can cause conflicts. Prefer the router's reservation feature when available, and never copy the public IP from this report into a device's local address field.
Can you change your public IP?
If your service is dynamic, reconnecting the router or waiting may produce a new address, but the provider can return the same one. Switching between Wi-Fi and mobile data usually changes the visible network. A VPN presents the VPN server's address for traffic that passes through it.
Do not repeatedly disconnect critical services just to chase a new IP. If you need a stable address for legitimate access, ask your provider about a static option. If your goal is privacy, remember that cookies, accounts and browser signals still exist after an IP change.
Summary
Dynamic addressing is normal and usually preferable for ordinary connections. Static public IPs solve specific routing and allowlist needs, while local DHCP reservations solve a different problem. Choose based on the actual service requirement, not on the assumption that static is always better.