When a device displays the message "Unable to obtain an IP address" when attempting to connect to a wireless network, it's one of the most common problems with home internet connections. The user sees a familiar network name and enters the correct password, but the process doesn't progress past the "Obtaining an IP address" step. This means the router or access point is unable to assign your device a unique identifier on the local network, without which data transfer is impossible.
In most cases, the failure occurs on the protocol side DHCP, which is responsible for automatically distributing addresses. The problem could be caused by an overflowing router address pool or a conflicting static settings on the phone or laptop itself. Sometimes, the cause is a simple software glitch in the operating system's network module. Android or Windows, which is resolved by simply restarting the services.
Don't panic and rush to a service center. Often, the solution lies in properly configuring TCP/IP settings or clearing the network connection cache. In this article, we'll cover all the effective methods, from simple reboots to manually entering addresses, that will help you restore internet access as quickly as possible.
Causes of DHCP error
Dynamic Host Configuration Protocol (DHCP) works on a request-response principle. When your device attempts to connect, it broadcasts a request, waiting for a response from the server (router). If there is no response or it comes with an error, the system displays a warning. One common cause is IP address conflict, when two devices on the network are assigned the same ID, which blocks both from working.
Another common scenario is exhausting the router's address pool. Many home routers are configured by default to distribute a limited number of addresses (e.g., from 192.168.1.100 to 192.168.1.110). If you have many guests or smart devices connected to your network at the same time, there may simply be no free addresses left for a new client.
⚠️ Attention: If you're using a public Wi-Fi network in a cafe or shopping mall, the error may mean that your provider has limited the number of simultaneous connections from a single MAC address or has exhausted the limit of available slots for visitors.
Software bugs in the wireless adapter drivers or the operating system itself also shouldn't be discounted. Updating router firmware or smartphone OS sometimes introduces changes to network stack algorithms, leading to incompatibility with old security or encryption settings.
Basic steps: reboot and network reset
Before delving into complex settings, it's necessary to perform a standard network "healing" procedure. First, completely power off the router by unplugging the power cable. Wait at least 30 seconds for the capacitors to discharge and the device's RAM to clear any temporary errors. Then power on the router and wait for the indicators to fully load.
On the client side (smartphone or tablet), perform the "Forget Network" operation. This will delete the saved connection profile along with any erroneous security settings. Afterwards, try connecting again, carefully entering the password. In the operating system Android This is done through the Wi-Fi menu by clicking on the network name and selecting the appropriate item.
If a simple reboot doesn't help, try a more radical method: resetting network settings. This will reset all network settings to factory defaults and delete saved Bluetooth and Wi-Fi passwords, but it often resolves the issue when the system is stuck in an error loop. The path to this function is usually located in the Settings → System → Reset settings → Reset Wi-Fi, mobile data, and Bluetooth.
☑️ Primary diagnostic checklist
Manually setting an IP address on Android
When automatic IP address distribution doesn't work, the best solution is to manually enter the parameters. Go to your Wi-Fi settings, click on your network name (or the gear icon), and select "Advanced" or "Advanced Settings." Find "IP Settings" and toggle it off. DHCP on Static (Static).
In the fields that open, you must enter the correct information corresponding to your local network. Typically, the gateway (router) has an address of 192.168.0.1 or 192.168.1.1. The device's address must be different from the router's address and other devices located on the same subnet. For example, if the gateway is 192.168.1.1, then the phone can be assigned 192.168.1.150.
IP address: 192.168.1.150Gateway: 192.168.1.1
Network prefix length: 24
DNS 1: 8.8.8.8
DNS 2: 8.8.4.4
Please note the "Network Prefix Length" field. Most home networks use the value 24, which corresponds to a subnet mask of 255.255.255.0. Using an incorrect prefix will result in the device formally connecting, but the internet will not work. It is also recommended to specify Google's DNS servers (listed above), as this often speeds up network response.
What to do if static IP doesn't work?
If manual configuration doesn't help, MAC address filtering may be enabled on your router. Check the list of blocked devices in the router's admin panel. Also, try changing your phone's MAC address in the Wi-Fi settings (set "Use randomized MAC" to Off).
Diagnosing problems on Windows and macOS
On computers running Windows The problem is often resolved by resetting the TCP/IP stack and clearing the DNS cache. Open a command prompt as administrator (right-click Start and select "Terminal (Administrator)" or "Command Prompt"). Enter the command ipconfig /releaseto reset the current address, and then ipconfig /renew to request a new one.
If this does not help, perform a full reset of network settings using the command netsh int ip resetAfter running the command, be sure to restart your computer. In the system macOS Similar actions can be performed by creating a new network location: go to System Preferences → Network, click on the Location drop-down list and select New Location, naming it something like Home Fix.
Antivirus programs or firewalls are often the cause of blocking on PCs, as they can incorrectly classify DHCP requests as suspicious activity. Try temporarily disabling your third-party antivirus and checking your connection. You should also update your wireless adapter drivers by downloading them from the official website of your laptop or motherboard manufacturer.
Setting up a DHCP server in a router
If the problem occurs on all devices, the router itself is most likely the problem. You need to log into the router's web interface (usually at 192.168.0.1 or 192.168.1.1) and find the section DHCP ServerCheck if this feature is enabled. Sometimes, after a firmware update, the settings can become corrupted, and the IP address distribution server becomes disabled.
A critical parameter is the "Start Address" and "End Address" of the pool. Make sure the range is large enough for the number of devices you have. For example, a range of 100 to 200 will allow up to 100 devices to be connected simultaneously. If you have 10 devices connected and the range is set to 100 to 105, the eleventh device will not receive an IP address.
| Parameter | Recommended value | Description |
|---|---|---|
| Enabling DHCP | Enable | Enables automatic address distribution |
| Initial IP | 192.168.1.100 | The first address in the distribution queue |
| Final IP | 192.168.1.200 | Last available address |
| Lease Time | 120 minutes | The time for which the address is issued |
It's also a good idea to increase the address lease time. If set too low, devices will constantly request address renewals, creating unnecessary network load and increasing the risk of conflicts. The optimal value for a home network is considered to be 2 hours (120 minutes) or more.
⚠️ Attention: Don't set the DHCP pool starting address too low (for example, 192.168.1.2) if your router's address is 192.168.1.1. This may cause a conflict if you decide to assign a static address to any printers or cameras at the beginning of the range.
Advanced Techniques: MAC Filtering and Channels
In some cases, the router blocks IP address sharing due to security settings. Check the "Wireless" -> "MAC Filtering" section. If this feature is enabled, ensure your device's MAC address is whitelisted. You can find your device's MAC address in the "About Phone" section or on a sticker under the battery.
Another hidden cause could be interference in the airwaves. If you live in an apartment building, neighboring routers may be jamming your signal, causing packet loss during the handshake, which interrupts the IP acquisition process. Try changing the Wi-Fi channel in your router settings from "Auto" to a fixed channel (e.g., 1, 6, or 11 for 2.4 GHz).
For devices that support 5 GHz, switching to this band solves the problem. It's less noisy and provides a more stable connection. However, keep in mind that 5 GHz has a shorter range, so to successfully obtain an IP address, move closer to the router while connecting.
Secret command for Android
In the dialing menu, enter ##4636## to access the test menu. You can try resetting the radio module there, but only do this if you're confident in your actions.
Frequently Asked Questions (FAQ)
Why does the error only occur on one specific phone?
The problem is most likely with the network settings cache of this particular device or its MAC address. Try resetting the network settings on this phone or enabling the "Use randomized MAC address" option in the Wi-Fi network properties to make the router recognize it as a new device.
Can a virus block the receipt of an IP address?
In theory, yes, malware can change network configurations or block DHCP requests. However, most often, the cause lies in incompatible encryption protocols (WPA2/WPA3) or outdated Wi-Fi module drivers.
What if static IP doesn't work either?
If neither DHCP nor static is working, the problem is almost certainly hardware (a faulty Wi-Fi module in your phone) or a critical error in the router firmware. Try connecting to a different Wi-Fi network (for example, from a friend's phone) to rule out a problem with the device itself.
How do I find out how many devices are currently connected to my router?
Log into your router's web interface (usually 192.168.0.1). The number of active connections is displayed on the main page or in the "Network Map" / "Client List" section. If there are more than 10-15, the address pool may be exhausted.