IP Address Conflict — How to Fix

by Marcus Reed Updated Apr 12, 2026

An IP address conflict occurs when two devices on your network are assigned the same IP address. This causes one or both devices to lose network connectivity, showing an error like "Windows has detected an IP address conflict."

Figure 1 — IP Address Conflict — How to Fix

Step-by-Step Guide

Restart your router — this reassigns IP addresses via DHCP, usually resolving the conflict.
Release and renew IP — on Windows, run ipconfig /release then ipconfig /renew.
Check for static IPs — if a device has a manually set IP that matches a DHCP-assigned one, change one of them.
Expand DHCP range — login to your router and increase the DHCP address pool.
Check for rogue DHCP servers — another device or router may be assigning conflicting IPs.

Related Guides

Video Tutorial

For more information, see Google Android Support.

Pro Tip: 80% of WiFi problems are solved by a simple router restart. Before doing anything complex, unplug your router for 30 seconds.

Key Takeaways

Restart your router first — this fixes 80% of issues
Test with Ethernet to determine if the problem is WiFi-specific
Check your DNS settings if websites won't load
Contact your ISP if all devices are affected — it may be their issue

Frequently Asked Questions

What causes an IP address conflict?

It happens when two devices get the same IP, usually from a misconfigured static IP, a rogue DHCP server, or a router that failed to track assigned addresses.

How do I fix an IP conflict?

Restart your router to reassign IPs, or run ipconfig /release and ipconfig /renew on the affected device.

About Marcus Reed

Marcus Reed is a network technician and technical writer who has configured and troubleshot routers and modems across thousands of home and small business installations for major ISPs including Comcast, AT&T, and Spectrum. That field experience across different hardware, firmware versions, and ISP environments gives him a practical command of what goes wrong and why. At RouterHax, he covers brand-specific router setup guides, ISP modem compatibility, and step-by-step troubleshooting tutorials.