Router DHCP IP Address Pool Exhaustion and Static IP Allocation
Diagnose network connections failing due to router DHCP lease scope exhaustion from smart home and mobile devices, and assign static IP leases.
Internal desktop parts run on harmless 12V DC voltage and cannot shock you. Simply unplug the wall power cable first, then touch the unpainted metal case frame to ground static electricity.
Common Symptoms & Tells
- Newly connected or rebooted PC cannot get an IP address, while already-connected devices work fine
- Wi-Fi connects but states: Connected, no internet, obtaining IP address stuck
- Router administrative log contains warnings: DHCP pool exhausted
Interactive Fix Checklist
0 of 4 steps completedCheck active DHCP leases in router portal
Open web browser, navigate to router gateway IP (usually 192.168.1.1 or 192.168.0.1), log in with admin credentials, and open DHCP Client List / Connected Devices.
Widen DHCP IP address range
In router LAN / DHCP settings, expand the starting and ending IP pool range (e.g. expand from 192.168.1.100-192.168.1.150 up to 192.168.1.20-192.168.1.240) to accommodate more client devices.
Reduce DHCP lease duration
Shorten DHCP lease time setting from default 7 days to 24 hours or 12 hours so abandoned leases from guest phones and transient devices are reclaimed promptly.
Create static DHCP reservation for PC
In router DHCP reservation table, add your computer MAC address and bind it to a dedicated static IP address outside the dynamic pool (e.g. 192.168.1.50).
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