Many wireless network users are familiar with the situation where a smartphone or laptop gets stuck at the "Obtaining IP address" stage or displays the message "No IP address assigned." This means your device has successfully connected to the router but was unable to obtain the digital ID required to access the internet. Without this unique number, data exchange between the device and the router is impossible, and the network remains unavailable.
This problem can be caused by a software glitch in the smartphone or tablet itself, or by a malfunctioning DHCP service on the router. Often, the conflict arises due to previously configured static settings or an address pool overflow if too many clients are connected to the network. In some cases, the culprit is antivirus software or a VPN service blocking the standard authorization process.
Don't panic and immediately take your equipment to a service center, as in most cases, the problem can be resolved independently in a few minutes. Below, we'll cover effective diagnostic methods, from simple reboots to manually configuring network protocols. Understanding how DHCP works will help you not only fix the current error but also prevent it from recurring.
Reasons for failure to obtain an IP address
The fundamental cause of the error is the inability to establish a proper dialogue between the client device and the DHCP (Dynamic Host Configuration Protocol) server. The router acts as such a server and must assign each connecting device a unique IP address from its own range. If this process is interrupted, the device remains "unknown" to the network and is unable to access the gateway.
One of the common reasons is IP address conflictWhen two devices on the same network are assigned the same identifier, this can happen if you manually assigned a static address that is already taken by someone else, or if the router's address lease table was corrupted after a power surge. As a result, the router cannot map your device's MAC address to the new IP address.
⚠️ Note: A common, but overlooked, cause is the "Random MAC Address" (Private Wi-Fi Address) feature enabled in modern versions of Android and iOS. The router may detect this as a new device each time and exhaust the connection limit or block it due to filtering.
The problem could also be caused by incompatible encryption protocols or channel congestion. If the router is running an older standard, 802.11b/g, and the device is trying to connect via WPA3The handshake may be successful, but the address assignment may not. Furthermore, the router's memory may be full, preventing it from processing new requests from clients.
Technical details of the DHCP process
The IP address acquisition process consists of four stages: Discovery, Offer, Request, and Acknowledge. The "IP address not assigned" error most often occurs during the Request or Acknowledge stage, when the router ignores the request or is unable to allocate a free resource from the pool.
Initial diagnostics and equipment reboot
The simplest and most often overlooked step is a full hardware reboot. This clears the router's RAM and resets any frozen network processes that could be blocking address distribution. Don't just turn off your smartphone's screen; you need to perform a full system reboot.
For a router, the procedure is as follows: turn off the power, wait at least 30 seconds, and then turn it back on. This time is necessary for the capacitors to fully discharge and the cache to be cleared. Also, reboot your smartphone, first turning the Wi-Fi module off and on again in the settings.
After turning on the equipment, wait 2-3 minutes for the router to fully boot up and stabilize the signal. Try connecting to the network again. If the "No IP address assigned" error persists, proceed to more advanced settings. It's important to ensure that the date and time on the device are set correctly, as some security certificates can block the connection if they become out of sync.
Setting up a static IP address on Android
If automatic address acquisition (DHCP) doesn't work, manually assigning a static IP address is an effective solution. This circumvents potential glitches in the dynamic configuration protocol. On Android devices, this can be done through the advanced settings of a specific Wi-Fi network.
Go to Wi-Fi settings, tap on the desired network and select "Edit" or "Delete network" (then reconnect). In the advanced settings, find "IP settings" and toggle it off. DHCP on StaticYou will need to enter the data manually, taking into account the structure of your network.
☑️ Parameters for static IP
Pay attention to the "Gateway" field—this is your router's address. If you haven't changed the default settings, it's usually 192.168.1.1 or 192.168.0.1The phone's IP address must differ from the gateway's only in the last digit (for example, 192.168.1.15). You can specify public DNS servers from Google (8.8.8.8) for more stable operation.
Troubleshooting for iOS and Windows devices
On Apple devices, the steps are similar, but the interface is different. Go to Settings → Wi-Fi, click the blue "i" icon next to your network name. At the bottom of the screen, find the "IP Configuration" button and switch the mode from "Automatic" to "Manual." You'll also need to enter your IP address, subnet mask, and router.
For Windows users experiencing the "No IP Address Assigned" issue when connecting to WiFi, the solution lies in the TCP/IPv4 protocol properties. Click Win + R, enter ncpa.cpl and find your wireless connection. Right-click, select "Properties," then "Internet Protocol Version 4 (TCP/IPv4)," and then "Properties" again.
| Parameter | Value for manual tuning | Default value (DHCP) |
|---|---|---|
| Obtain an IP automatically | Off | Included |
| IP address | 192.168.1.X (where X is from 2 to 254) | Determined by the router |
| Subnet mask | 255.255.255.0 | Determined by the router |
| Main gateway | 192.168.1.1 (router address) | Determined by the router |
After making changes, be sure to click "OK" in all windows. If the issue was an address conflict or a Windows DHCP client failure, the connection should be restored. In some cases, resetting the network settings with the command netsh winsock reset in the command line as administrator.
Reset network settings and clear configuration
If manual configuration doesn't help, the system may have accumulated configuration errors or corrupted system files responsible for the network stack. In this case, a full reset of network settings to factory defaults is the solution. This will delete all saved Wi-Fi passwords, Bluetooth settings, and VPN settings.
On Android, this feature is located along the path Settings → System → Reset settings → Reset Wi-Fi, mobile data, and BluetoothOn iPhone: Settings → General → Transfer or reset iPhone → Reset → Reset Network SettingsThe device will reboot, and you will have to re-enter passwords for all networks.
⚠️ Note: Resetting network settings does not affect your personal files, photos, or apps. However, if you have corporate Wi-Fi configured with complex certificates or static IP addresses, you will need to reconfigure them manually.
After resetting, try connecting to the problematic network. The system will create a new connection profile with clear parameters, which often resolves software conflicts. If this doesn't help, the problem may lie in the router's settings, specifically an overflowing DHCP pool or enabled MAC filtering.
Setting up a DHCP server on a router
When all client devices fail to obtain an IP address, the source of the problem is almost certainly the router. You will need to access the admin panel (usually via a browser at 192.168.0.1 or 192.168.1.1). Find the section LAN or DHCP Server.
Check if the DHCP server function is enabled. Make sure the address range (pool) is large enough. For example, if the range is set from 192.168.1.100 to 192.168.1.110, then only 10 devices can operate on the network at the same time. Expand the range, for example, to 192.168.1.200.
Also check the address lease time. If it's set too high (e.g., a week) and devices change frequently, the address table may become full of "dead" entries. Reduce the lease time to 120 minutes (2 hours) or 1 day. This will force devices to renew their leases more frequently and release addresses when disconnected.
Additional troubleshooting methods
There are a number of less obvious reasons that can block IP address acquisition. Antivirus applications on the phone (such as Kaspersky, Dr.Web or Avast) have built-in firewalls that may mistakenly block DHCP requests. Try temporarily disabling the protection or uninstalling the application to test.
Another method is changing the device's MAC address (MAC cloning). Some ISPs or network administrators block connections based on MAC addresses. In Android's Wi-Fi settings (under "Advanced" or "Privacy"), you can select "Use device MAC address" instead of the randomized one, or conversely, generate a new random address.
If all else fails, the router firmware or the phone's physical Wi-Fi module may be damaged. Try connecting to a different network (sharing from a different phone). If everything works there, the problem is with the router. If it works anywhere, the device's network card likely needs repair.
Why doesn't the router assign an IP address even after rebooting?
This may indicate a critical software error or hardware failure. Try performing a hard reset of the router using the reset button on the back panel and holding it for 10-15 seconds. This will restore the device to factory settings.
Can a virus on a phone block IP address acquisition?
Yes, malware can modify system hosts files or network stack settings, redirecting traffic or blocking DHCP requests. It is recommended to scan your device with a reliable antivirus or perform a factory reset.
Does internet speed affect obtaining an IP address?
No, your ISP's internet speed doesn't affect the process of obtaining a local IP address within the network. This process occurs between your device and the router and doesn't require access to the external network.