DHCP is the automatic address service that lets a phone, laptop, smart TV, or console join a network without you typing IP settings by hand. Your router normally runs DHCP for the whole home.
Does this affect you?
Use this if you saw DHCP in router settings, device settings, or a connection error. DHCP stands for Dynamic Host Configuration Protocol, and it hands each device an IP address plus the related details it needs, including subnet mask, gateway, and DNS servers.
Check that DHCP is set up correctly
On a normal home network, the router DHCP server should be on and devices should be set to automatic.
Confirm the device is using DHCP:
- Windows: open Settings > Network & internet, choose the active connection, and check IP assignment. It should say Automatic (DHCP), not Manual.
- Mac: open System Settings > Network, select the connection, click Details > TCP/IP, and confirm Configure IPv4 is set to Using DHCP.
- iPhone or Android: open Settings > Wi-Fi, tap the network details, and check that IPv4 is Automatic or DHCP instead of Manual or Static.
Confirm DHCP on the router:
- Log into the router app or admin page.
- Open LAN Setup, Network Settings, or DHCP Settings.
- Find DHCP Server and make sure it is enabled.
- Check the address pool if many devices are connected. A very small pool can run out of available addresses.
Understand common DHCP clues
A few signs tell you whether DHCP is working.
- An address beginning with 169.254 means the device could not get an address from DHCP and assigned itself a temporary local address. It will not reach the internet that way.
- A lease time is how long the router lets a device keep an address before renewing it. This is why local IP addresses can change over time.
- Unplugging and reconnecting Wi-Fi, or restarting a device, forces a new DHCP request and can clear a stuck address.
- If several devices fail at once, check the router DHCP server rather than troubleshooting each device separately.
More control
Use DHCP reservation for important devices
Printers, cameras, NAS drives, and home servers often need a stable local address. A DHCP reservation tells the router to give one device the same address every time, without manually entering gateway and subnet details on the device.
Manual IP is rarely needed
Manual static IP settings can work, but one wrong gateway, DNS server, or duplicate address can break the connection. For most homes, automatic DHCP plus reservations is cleaner.
Sources
- Cloudflare Learning Center – What Is DHCP? (2025)
- Microsoft Support – How DHCP assigns IP addresses (2025)
- Netgear Support – What is DHCP and how does it work? (2025)