A notification appears saying “Windows has detected an IP address conflict,” and the internet stops working until you reconnect. When a Windows 10 IP address conflict keeps returning, it usually means slot online two devices on the network believe they own the same address.
Each device on a home network needs a unique IP address, normally handed out automatically by the router. Conflicts occur when one device has a fixed address that the router also gives to someone else, or when the router’s address list becomes confused.
Printers, smart TVs, and PCs set up with a manual address years ago are frequent culprits.
Letting the router manage addresses, and refreshing them, usually ends the conflict.
What Usually Triggers It
Address conflicts happen for these reasons:
- The PC or another device has a manually set IP address inside the router’s automatic range.
- The router’s DHCP service has handed out the same address twice after a restart or fault.
- A second router or access point is also handing out addresses.
- A device returned from sleep still using an old address.
Mesh systems and extra routers set up incorrectly can create two separate address pools on one network.
First Steps to Try
Refresh the address.
- Restart the router and the PC.
- Open Command Prompt as administrator and run ipconfig /release, then ipconfig /renew.
- Press Windows + R, type ncpa.cpl, open your adapter’s IPv4 properties, and choose “Obtain an IP address automatically.”
- Do the same check on printers and other devices with network settings.
- Watch whether the conflict message returns.
If the PC had a manual address, switching it to automatic usually solves the problem immediately.
If the Problem Continues
Fix the network’s address plan.
- Log in to the router and look at the list of connected devices to find duplicates.
- Instead of manual addresses on devices, create DHCP reservations in the router for printers or servers.
- Make sure only one router hands out addresses. Put extra routers into access point or bridge mode.
- Update the router firmware.
- Run netsh int ip reset on the PC and restart.
Reserving addresses in the router keeps devices on fixed addresses without risking conflicts.
Protect Your Data First
Write down any manual network settings before changing them, especially on work devices or servers. Changing router settings affects every device in the house, so make one change at a time.
The Bottom Line
IP conflicts occur when two devices share an address. Set devices to obtain addresses automatically, renew the address, and use router reservations for devices that need fixed addresses.
Note which devices have fixed addresses in a small list, so future changes to the network do not create new conflicts.
