Many users are familiar with the situation when a mobile device or laptop endlessly hangs on the phrase "Obtaining IP address." The screen goes blank, the connection is dropped, and you are again presented with the familiar password prompt. This is a classic sign that the process DHCP request cannot complete successfully, and your gadget does not receive a digital pass to the local network.
The problem could be due to a software glitch in the smartphone itself, or an overcrowded address table in your router. Often, the cause is a conflict in encryption versions or simple channel congestion in an apartment building. Understanding why exactly If a failure occurs during the address assignment stage, it allows you to fix the problem in a couple of minutes, without resorting to complex manipulations.
In this article, we'll detail the mechanics of the connection process and offer step-by-step solutions for various operating systems. You'll learn how to diagnose router issues and manually configure static settings if automatic mode stops working correctly.
Failure mechanics: what happens when you connect
When you select a network from the list of available connections, your device sends a broadcast request. The router, upon receiving this signal, must allocate a free network. IP address from its pool and notify the client about it. If this dialogue is interrupted or the response is not received in a timely manner, the system reports that the address is being obtained and ultimately terminates the connection.
The main protocol responsible for this procedure is DHCP (Dynamic Host Configuration Protocol). This is what controls the allocation of addresses. If the router's DHCP server is frozen, has exhausted its limit of allocated addresses, or is malfunctioning due to a firmware bug, new devices simply can't get through the door.
⚠️ Important: If your router only assigns IP addresses to certain devices and rejects others, MAC address filtering may be enabled. Check the list of allowed clients in your security settings.
It's also worth considering that modern routers operate in two ranges: 2.4 GHz And 5 GHzThe problem is often observed in the congested 2.4 GHz band, where numerous neighboring networks create interference, preventing the handshake between the client and the access point from completing.
Restart and reset the device's network settings
The simplest and often most effective solution is a full reboot cycle. This clears the network module cache and clears temporary stack errors. TCP/IPOn Android and iOS smartphones, this is done through the settings menu, not simply by turning off the screen.
On Android you need to go to Settings → System → Reset settings → Reset Wi-Fi, mobile data, and Bluetooth settingsThis operation will delete all saved passwords and Bluetooth settings, but is guaranteed to clear configuration errors that prevent the address from being obtained.
☑️ Quick Reset Checklist
For iPhone owners, the procedure is different: Settings → General → Transfer or reset iPhone → Reset → Reset Network SettingsAfter this operation, the phone will reboot, and you will have to re-enter the Wi-Fi password, but this often solves the problem of freezing at the IP acquisition stage.
If a soft reset doesn't help, check the date and time. Incorrectly set time can cause security certificate conflicts, causing the router to reject the connection request. Make sure the "Use network time" option is selected.
Router diagnostics and settings
If the problem occurs on all devices in the house, the router itself is the cause. It's possible the DHCP address pool has run out. By default, a router can only allocate, for example, 50 addresses. If you have a smart home with dozens of sensors, light bulbs, and gadgets, this limit may be reached.
Log into your router's web interface (usually at 192.168.0.1 or 192.168.1.1) and find the section DHCP ServerIncrease the address range (Start IP and End IP). For example, set the range from 192.168.1.2 to 192.168.1.254. This is guaranteed to solve the address shortage problem.
td>192.168.1.254
| Parameter | Recommended value | Description |
|---|---|---|
| DHCP Server | Enable | Must be active for automatic IP allocation. |
| Start IP Address | 192.168.1.2 | Start of the range of addresses issued |
| End IP Address | End of range (maximum clients) | |
| Address Lease Time | 120 minutes | Address lease time before renewal |
Another common cause is a conflict between encryption types. Some older devices don't work well with this mode. WPA3 or mixed mode WPA2/WPA3Try forcing the security mode into your wireless network settings. WPA2-PSK (AES)This is the most compatible standard.
What should I do if the router interface won't open?
If you can't access your router settings, try connecting to it via a LAN cable. Sometimes the router's wireless module freezes, but the wired connection remains functional, allowing you to configure it.
⚠️ Note: Router interfaces vary from manufacturer to manufacturer (Asus, TP-Link, Keenetic, Xiaomi). Menu item names may vary, but the logic for setting up DHCP remains the same.
Android Solution: Static IP
If automatic address acquisition doesn't work, you can try entering the parameters manually. This will bypass the router's DHCP server and force the phone to use a specific address you specify.
In the list of available networks, tap the name of your Wi-Fi network and select "Forget network" or "Delete." Then tap it again to connect. In the password entry window that appears, select "More" or "Advanced settings."
Find the line "IP Settings" and toggle it off DHCP on Static (Static). You will need to enter the following information:
- 📱 IP address: Enter an address in the same subnet as your router (for example, if your router is 192.168.1.1, enter 192.168.1.155).
- 🌐 Gateway: your router's address (usually 192.168.0.1 or 192.168.1.1).
- 🔢 Network prefix length: usually 24.
- 🖥 DNS 1: You can specify 8.8.8.8 (Google) or the gateway address.
After entering the data, save the settings. If the address is correct and isn't already in use by another device, the connection will be established instantly. This method is especially useful for older devices that don't work well with new router protocols.
Connection Features on iOS and macOS
Apple devices have their own networking quirks. If your iPhone or MacBook displays "Obtaining IP address" and then drops the connection, first check to see if "Private Wi-Fi Address" is enabled. This feature changes the device's MAC address for each network, and some routers may block such changes.
Go to Settings → Wi-Fi, click the blue "i" icon next to your network. Find the "Private Address" toggle and try disabling it. The network will then reconnect.
On iOS, resetting network settings, as mentioned above, can also help, but there's a more sophisticated solution. In the "IP Settings" section (the same as on Android, if you tap "Configure IP"), you can try switching the mode from "Automatic" to "Manual" and entering a static address, similar to the instructions for Android.
On macOS, it's worth checking the service mDNSResponder, which is responsible for name resolution. Sometimes restarting it via the terminal helps restore the connection, but most often the problem is solved by deleting the network configuration profile or creating a new location in the network settings.
Driver and hardware issues on Windows
On Windows laptops, the "Unable to obtain an IP address" error is often related to the wireless adapter driver. The driver may have crashed after a system update or may be malfunctioning.
Open device Manager (Press Win+X and select the appropriate option.) Find the "Network adapters" section, select your Wi-Fi module (often with "Wireless" or "802.11" in the name). Right-click and select "Uninstall device." Don't worry, Windows will reinstall the driver after rebooting.
netsh winsock resetnetsh int ip reset
ipconfig /release
ipconfig /renew
ipconfig /flushdns
This sequence of commands can be entered in a command prompt running as administrator to completely reset the Windows network stack. This is a powerful tool that resolves 90% of software failures.
If reinstalling drivers and resetting the stack doesn't help, the laptop's Wi-Fi module may be faulty or making poor contact with the motherboard. In this case, try connecting via a USB Wi-Fi adapter.
When the culprit is the provider or external factors
Sometimes the problem lies outside your local network. If the router can't obtain a WAN IP from the ISP or its DHCP client is frozen, it may also be interacting with local clients. Check the indicators on the router: if the error indicator (often a red exclamation point or globe icon) is lit or flashing, the problem is on the ISP's end.
Electromagnetic interference should also be considered. Microwave ovens, baby monitors, and high-power Bluetooth devices operate at 2.4 GHz. If the router is located near the microwave, the Wi-Fi connection may be completely disrupted while the microwave is in use, and devices will be stuck obtaining an IP address.
⚠️ Note: If you live in a high-density apartment building, Wi-Fi channels may be heavily polluted. Use analyzer apps (such as Wi-Fi Analyzer) to find a clear channel and switch your router to it.
In rare cases, outdated router firmware is the cause. Manufacturers regularly release updates that fix issues with the DHCP server and wireless module stability. Check for updates in the "System Tools" or "Administration" sections.
Why doesn't the router assign an IP address to a new device, even though others are working?
Most likely, MAC address filtering (blacklist/whitelist) has been triggered, or the DHCP address pool has been exhausted. It's also possible that the device is attempting to connect using an old security profile, which the router is now rejecting.
Can an antivirus block the receipt of an IP address?
Yes, some third-party firewalls and antiviruses (Kaspersky, ESET, Avast) have network protection modules. If they detect a network as "public" or unsafe, they may block DHCP requests. Try temporarily disabling the network protection.
What does the "IP address not obtained" error mean after resetting the router?
After a reset, the router returns to factory settings. If your ISP uses MAC address binding, you won't be able to connect to the internet until you clone your computer's MAC address in the router settings or call your ISP.
How do I know how many devices are connected to my Wi-Fi?
Access your router's web interface. The main page or the "Client List" (DHCP Client List) section displays all devices currently assigned an IP address. If there are a large number of devices, your neighbors may be stealing your Wi-Fi.