What changing your IP address means and why you might do it

Your IP address is a number that identifies your device on the internet — like a mailing address for data. When you change it, you're telling your router to assign your device a different number. Most home networks do this automatically, but you can force a change manually if your device is running slowly, you're having connection trouble, or you want a fresh start after network problems.

The process differs depending on whether you want to change the address your internet provider assigned to your whole house (your public IP), or the address your router assigned to a single device like a computer or phone (your private IP). Most home troubleshooting involves the private address, which you control directly.

Key Takeaways

  • Restarting your modem and router is the simplest way to change your public IP address, and works because your internet provider reassigns it when you reconnect.
  • To change a device's private IP address, you can unplug it from the network for a few minutes, restart it, or manually assign a new address through your device's network settings.
  • Most home networks use DHCP, which means your router hands out addresses automatically — you don't need to do anything unless a device is stuck with the wrong one.
  • Manually setting a static IP address on a device requires you to enter the address directly in network settings and should only be done if you have a specific reason.

Restarting your modem and router to change your public IP

Your public IP address — the one your internet provider assigns to your home — changes when you disconnect from the internet and reconnect. The fastest way to force this is to restart both your modem and router.

Unplug the modem first and wait 30 seconds, then plug it back in. Wait for all the lights to stabilize (usually two to three minutes). Then unplug the router, wait 30 seconds, and plug it back in. Wait another two to three minutes for it to fully restart. Your internet provider will assign a new public IP address during this reconnection.

This method works because your modem has to re-authenticate with your internet provider's system, and that's when a new address gets handed out. If you only restart the router without restarting the modem, your public IP usually stays the same.

Releasing and renewing a device's private IP address

Each device on your home network — your laptop, phone, printer — gets a private IP address from your router. If a device is having connection problems or you want to force it to get a fresh address, you can release the old one and request a new one.

The simplest method is to disconnect the device from your network (turn off Wi-Fi or unplug the ethernet cable), wait one minute, then reconnect. Your router will assign it a new private IP address automatically.

If that doesn't work, you can manually release and renew the address through your device's network settings. On Windows, open Command Prompt and type ipconfig /release, then ipconfig /renew. On Mac, go to System Settings > Network, select your connection, and click Advanced, then TCP/IP, then Renew DHCP Lease. On an iPhone or Android phone, turn airplane mode on for 10 seconds, then turn it off.

Manually assigning a static IP address to a device

Instead of letting your router assign an address automatically, you can manually set one that stays the same every time the device connects. This is called a static IP address and is useful if you're running a home server, setting up a printer that needs a consistent address, or troubleshooting network problems that require a fixed address.

On Windows, go to Settings > Network & Internet > Advanced Network Settings > More Network Adapter Options. Right-click your connection, select Properties, then select Internet Protocol Version 4 (IPv4) and click Properties. Choose "Use the following IP address" and enter an address in the same range as your router (usually 192.168.1.X, where X is a number between 2 and 254). Enter your router's address as the Default Gateway and 255.255.255.0 as the Subnet Mask.

On Mac, go to System Settings > Network, select your connection, click Advanced, then TCP/IP. Change the Configure IPv4 dropdown to "Manually" and enter your static address, subnet mask, and router address.

On iPhone or iPad, go to Settings > Wi-Fi, tap the network name, then tap Configure IP. Choose "Manual" and enter the static address. On Android, go to Settings > Network & Internet > Wi-Fi, tap the network, then tap Edit. Scroll down and tap Advanced Options, then change IP Settings from DHCP to Static and enter your address.

When to use DHCP versus static addresses

DHCP is the automatic system most home networks use — your router assigns addresses and changes them as needed. It's simpler and requires no setup. Use DHCP for phones, laptops, tablets, and any device you move between networks.

Static addresses are for devices that need to stay in one place and need the same address every time. Use static for printers, network storage devices, security cameras, or a computer running a home server. If you set a static address on a device, make sure you pick a number your router won't try to assign to something else — most routers have a DHCP range (like 192.168.1.100 to 192.168.1.254) and you should pick a number outside that range.

Troubleshooting when your IP address won't change

If you've restarted your device or your modem and the IP address is still the same, check whether your device is actually connected to the network. On Windows, open Command Prompt and type ipconfig to see all your network connections and their addresses. On Mac, go to System Settings > Network to see your current connection and address.

If your device is connected but the address hasn't changed after a restart, try unplugging your modem for a full five minutes instead of 30 seconds — some internet providers cache the address longer. If you manually set a static address and it's not working, double-check that you entered the correct subnet mask and default gateway, which you can find by typing ipconfig (Windows) or checking System Settings > Network > Advanced > TCP/IP (Mac).

If you're trying to change your public IP and it's still the same after restarting both modem and router, wait a few hours — some internet providers take longer to reassign addresses. If it's been more than a day, contact your internet provider to ask whether your account is set to a static public IP, which they would need to change.

Frequently Asked Questions

Will changing my IP address affect my internet speed?

No. Your IP address is just an identifier — changing it doesn't affect how fast data moves. If you're changing your IP to fix a slow connection, the speed improvement (if any) comes from the restart itself, not the new address. Restarting clears your device's memory and reconnects fresh, which sometimes helps, but a new IP address alone won't make you faster.

Can I pick any IP address I want for my device?

For a private address on your home network, you should pick one in the same range as your router (usually 192.168.1.X or 10.0.0.X) and outside your router's DHCP range. For your public IP address, no — your internet provider assigns it and you can't choose it. You can only force a new one by restarting your modem.

Do I need to change my IP address regularly?

No. Most people never need to manually change their IP address. Your router handles it automatically through DHCP. Only change it if you're troubleshooting a specific problem, setting up a device that needs a static address, or your internet provider tells you to.

What's the difference between IPv4 and IPv6?

IPv4 is the older standard (the 192.168.1.X format you see on most home networks). IPv6 is the newer standard with a longer format. Most home networks still use IPv4, but some internet providers are adding IPv6 support. You don't need to choose between them — your device can use both at the same time.