ASUS Router DHCP Error — What It Means & How to Fix It

What Does This Error Mean?

A DHCP error on an ASUS router means devices on your network can't get an IP address. Without an IP address, devices show 'Limited connectivity' or 'No internet' even though the router is working. This is usually caused by a misconfigured DHCP range, an exhausted IP pool, or the DHCP server being accidentally disabled.

Affected Models

ASUS RT-AX88U
ASUS RT-AX86U
ASUS RT-AX58U
ASUS RT-AC68U
ASUS ZenWiFi and most ASUS router models

Common Causes

The DHCP server on the router has been accidentally turned off in the settings
The DHCP IP address pool has run out because too many devices are connected
The lease time is set too short and devices lose their IP before renewing
A conflicting DHCP server (another router on the network) is assigning different IP addresses
The router firmware has a bug causing the DHCP server to crash or behave incorrectly

How to Fix It

Log into the ASUS admin panel at 192.168.1.1. Go to LAN > DHCP Server. Make sure 'Enable the DHCP Server' is set to Yes.

The DHCP server can be accidentally disabled when exploring settings or when another router is added to the network.
Check the IP Pool Start and End addresses. A typical range should be something like 192.168.1.2 to 192.168.1.254 — this provides up to 253 IP addresses.

If your range is something like 192.168.1.2 to 192.168.1.10, you have only 9 available addresses. A household with 10+ devices will run out immediately.
Check for a second router on your network. If a modem-router combo from your ISP is also handing out IP addresses, you have two DHCP servers fighting each other. Put the ISP's device in bridge mode or disable its DHCP server.

Two active DHCP servers on the same network cause unpredictable connectivity — some devices work and some don't.
Restart the router. Unplug it for 30 seconds and plug it back in. Connected devices should automatically get new IP addresses within a minute of the router starting up.

A restart clears any DHCP server glitches caused by memory overflow or firmware bugs.
Update the router firmware. DHCP server bugs are sometimes fixed in firmware updates. Log into the admin panel, go to Administration > Firmware Upgrade, and install any available update.

If DHCP keeps failing after a firmware update, perform a factory reset and reconfigure the router from scratch.

When to Call a Professional

DHCP configuration is handled entirely within the router's admin panel. You do not need a technician for this issue. If the DHCP server keeps failing after correct configuration, a firmware update or factory reset will resolve it.

Frequently Asked Questions

What does 'DHCP' stand for and what does it do?

DHCP stands for Dynamic Host Configuration Protocol. It automatically assigns an IP address to each device when it joins your network. Think of it like a hotel receptionist assigning room numbers. Without DHCP, you would have to manually set an IP address on every device — phone, laptop, tablet, smart TV, etc. The router's built-in DHCP server handles this automatically.

My device shows 169.254.x.x instead of 192.168.x.x. What does that mean?

A 169.254.x.x address (called APIPA) means the device could not get an IP from the DHCP server. The device assigned itself a fallback address to indicate the failure. Check that the router's DHCP server is enabled and the IP pool is not exhausted.

How many devices can connect to an ASUS router?

The default ASUS DHCP pool supports around 253 devices (192.168.1.2 to 192.168.1.254). However, most homes never exceed 30 to 50 devices. If you are running a small office with many devices, make sure the DHCP pool is large enough and consider using static IP assignments for servers and printers.