Slow WiFi usually has one of a few causes: a crowded wireless channel, a weak signal from distance or obstacles, the wrong frequency band, or another device using all the bandwidth. The good news is that you can diagnose each of these from your phone in a few minutes and fix most of them without calling your provider.
WiFi is radio, and radio gets crowded. In a typical apartment building, many routers broadcast on the same frequencies at once, and they interfere with each other the way two people talking over each other become hard to understand. Walls, floors, and even microwave ovens weaken or disrupt the signal further.
Two details matter most. First, the frequency band: the older 2.4 GHz band reaches farther but is slower and far more congested; the 5 GHz band is faster and cleaner but has shorter range. Second, the channel: each band is divided into channels, and if your router shares a channel with several neighbours, everyone’s speed drops. On 2.4 GHz only channels 1, 6, and 11 do not overlap, so these are usually the safest choices.
Before changing anything, find out where the problem is. A slow connection on one device that is fine on others points to WiFi or that device; slow speed everywhere points to the internet line itself.
google.com.Ping measures the round-trip time for a small packet to reach a server and come back. A consistent result of a few to a few dozen milliseconds means packets travel cleanly; spikes and gaps mean some packets are delayed or lost and have to be sent again, and those retransmissions are exactly what make pages stall and video buffer.
This test isolates the problem because the very first leg of any ping is the hop between your device and your own router. If the round trip is already unstable on that local leg, the wireless link is the bottleneck and no faster internet plan will help until you fix it. If the local leg is clean but distant servers respond slowly, the delay lives out on the provider’s network, beyond your control.
If you are not sure what your addresses mean while testing, see how to find your IP address.
A channel is a slice of the frequency band, and devices on the same or overlapping channels must take turns transmitting. When several networks share one channel, each one waits longer for a clear moment to “speak”, so throughput falls even when your signal is strong. On the analyzer’s graph this appears as tall curves stacked over the same channel – that overlap is contention you can see.
Channel width matters too. Wider channels (40 or 80 MHz) carry more data per transmission but overlap more neighbours; narrower ones (20 MHz) move less per device but collide far less often. In a crowded building, a clean 20 MHz channel frequently beats a congested wide one, which is why “more width” is not always faster.
Signal strength is measured in dBm, a negative number where closer to zero is stronger – roughly, -50 dBm is excellent, -70 dBm is workable, and -80 dBm is barely usable. The WiFi Analyzer shows this value for each network, so you can walk around and watch it rise or fall to find dead spots and the best router placement.
The two bands trade range for speed because of physics. Higher-frequency 5 GHz waves carry more data but lose energy faster as they pass through walls and floors; lower-frequency 2.4 GHz waves penetrate obstacles better but cannot carry as much. Water absorbs 2.4 GHz especially well, which is part of why a room full of people, or a fish tank, can noticeably weaken the signal. Placing the router centrally and high simply reduces how many obstacles the signal must cross to reach you.
A single device downloading in the background can slow everyone down. To see what is connected to your own network:
For a closer look at any connected device, the LAN Scanner help page explains each field.
A home connection shares one pipe, so a single device uploading a backup or streaming in high definition can fill it and leave little for everyone else. This usually shows up as lag that comes and goes rather than a constant slowdown, which makes it hard to spot without looking at the device list.
A LAN scan helps because it reveals every device by IP address, name, and manufacturer, letting you match each entry to something you actually own. An unfamiliar device is worth investigating: besides using bandwidth, it may be connected without your knowledge. Changing the WiFi password is the surest way to remove it, but be aware that it disconnects every device at once – afterwards you will have to reconnect and reconfigure each one you own (phones, TVs, smart-home gadgets, printers) with the new password, and re-pair anything that syncs over the network. Reserve this step for when you genuinely suspect an unauthorised device.
Why is my WiFi slower than the speed I pay for?
WiFi speed is almost always lower than your wired plan speed because of signal loss, distance, and channel congestion. Test with a device next to the router to see the realistic maximum.
Is 2.4 GHz or 5 GHz better?
5 GHz is faster and less congested but covers less distance. 2.4 GHz reaches farther through walls but is slower. Use 5 GHz nearby and 2.4 GHz for far rooms.
Which WiFi channel is best?
On 2.4 GHz, channels 1, 6, and 11 do not overlap and are usually best. On 5 GHz there are many non-overlapping channels, so pick whichever the analyzer shows as least used.
Does restarting the router help?
It can clear temporary glitches, but if slowness returns regularly, the cause is usually channel congestion or signal, which the steps above address.
A guest network is a second WiFi name your router broadcasts for visitors, with its own password and no access to the rest of your network. It lets people get online without handing over your main password or letting their devices see yours. Almost every modern router can create one, and you can turn it on from your phone in a few minutes.
A guest network is a separate, walled-off WiFi served by the same router. Devices that join it reach the internet normally, but they are kept apart from the devices on your main network – they cannot see your computer, your files, or your smart-home gadgets. It has its own name and password, so sharing access never means sharing the keys to your primary network.
Technically the router places guest devices in their own isolated zone. The internet connection is shared, but the local visibility between your private devices and the guest devices is removed. That separation is the whole point: a guest gets exactly what they need – a connection – and nothing else.
There are three solid reasons to run one:
The underlying value is containment. Your main network holds the things you care about – personal files, backups, work devices – while the guest network is a buffer for everything you do not fully control. If something on the guest side goes wrong, the damage cannot spread to your private side.
The exact menu name varies by brand, but the feature is in the same place on most routers: alongside the main wireless settings. Give the guest network a name that is obviously yours, such as “Smith-Guest”, so visitors know which one to pick. Use a password that is easy to read aloud but still strong, because you will share it more often than your main one.
These options decide how strictly the guest network is fenced off and how much of your connection it may use. Client isolation is the one that matters most for safety; the rest are about comfort and control. After saving, confirm everything works by joining the guest network from a phone, then run a quick scan as described in how to see who is connected to your WiFi to check that guest devices stay separate.
Does a guest network slow down my main WiFi?
It shares the same connection, so heavy guest use can compete for bandwidth. A bandwidth limit on the guest network prevents that.
Can guests see my devices on a guest network?
No, as long as client isolation is on. That is the setting that keeps guest devices from reaching your private ones.
Should I put smart-home devices on the guest network?
It is a common and sensible choice for gadgets that only need internet access, since it keeps a frequent weak point away from your main devices.
Is a guest network the same as a second router?
No. It is one router broadcasting a second, isolated WiFi name, so there is no extra hardware to buy or set up.
Two passwords get called “the router password”, and the first step is knowing which one you mean. One is the Wi-Fi password your devices use to join the network; the other is the admin password that logs you into the router’s settings. They are usually different, and you recover each one differently. Everything below assumes the router is your own – recovery comes down to information you already have access to, or a reset that only the owner can perform.
Working out which password is missing saves a lot of effort, because the easy fix for one does not touch the other.
The Wi-Fi password is usually the easier of the two to recover, because any device that is already connected is holding a copy:
Start with the simple possibilities. If the admin login was never changed, the default username and password are printed on the router’s label or listed in its manual – try those first. Many routers ship with something like “admin” in both fields.
If the admin password was changed and the new one is lost, there is no shortcut: the only way back in is a factory reset, which clears the password along with everything else. That is a real step with real consequences, so it is worth understanding before you press the button.
A factory reset returns the router to the state it left the shop in. Find the small recessed reset button, usually on the back, hold it in with a pin for about ten seconds while the router is powered on, then release; it restarts with all defaults restored.
This erases every setting, not just the password – and that is the part people underestimate:
For all those reasons, treat a factory reset as a last resort for the admin password, not a routine fix.
After a reset – or any time you need the settings page – you reach it through the router’s address in a browser. That address is your network’s gateway, and if you are not sure what it is, the Router Setup tool in IP Tools (Android) or WiFi Tools (iOS) shows it, as does the IP Info screen. Open it, log in with the now-default admin credentials, and set a new admin password straight away.
This time, write both passwords down somewhere you will find them again – a password manager is ideal. For a walkthrough of the settings page itself, see setting up your router from your phone; for what the gateway address is, see what is an IP address, subnet mask, and gateway.
Is the Wi-Fi password the same as the router password?
Not usually. The Wi-Fi password connects devices to the network; the admin (router) password logs into the settings page. They are separate and can be changed independently.
How do I find my Wi-Fi password without resetting?
View it on a device that is already connected – Windows, Mac, and phones can all show a saved Wi-Fi password – or read it from the router’s settings page, or its label if it was never changed.
What happens if I reset my router?
Everything returns to factory defaults: the Wi-Fi name and password, and all custom settings. Every device must reconnect, and you will need to set the router up again, so reset only as a last resort.
I reset the router and now my devices will not connect.
That is expected – the Wi-Fi password changed back to the default on the label. Reconnect each device using the default details, or set your own Wi-Fi name and password again in the settings.
Staying in a rental or a hotel, it is reasonable to want to know that no one is watching. Many hidden cameras connect to Wi-Fi to stream or store their footage, which means a scan of the network you are on can sometimes reveal one – it appears as just another connected device. It is a quick, practical check, but it has real limits, and knowing both sides keeps your expectations honest.
A scan lists the devices currently connected to the same Wi-Fi as you, so it can surface a camera on that network – often with a manufacturer name that gives it away. What it cannot do is find every camera:
The scanner does the discovery for you; your job is to recognise what should be there and notice what should not. For a fuller explanation of reading a device list, see who is connected to your Wi-Fi.
The useful signal is a device you cannot explain. Manufacturer names are the biggest clue – well-known camera makers often show up by name, and a label like “camera” or “IPC” is an obvious flag. But names can also be generic or missing, so do not rely on them alone:
A single unexplained device is not proof of a camera, but it tells you where to look next.
Because not every camera is on the Wi-Fi, a network scan works best alongside a quick physical look:
Together, the network check and the physical check cover far more ground than either alone.
If you find a camera where there should not be one, your safety comes first: document what you found with a photo, avoid handling it more than necessary, and move out of its view. For a rental, report it to the booking platform and, where it involves a private space, to local authorities – recording guests in bedrooms or bathrooms is illegal in most places.
Can I really find a hidden camera by scanning Wi-Fi?
Sometimes. A scan reveals cameras connected to the same network, often by their manufacturer name, but it cannot find cameras on a separate network, ones with their own mobile connection, or ones that only record locally.
What does a hidden camera look like on a network scan?
Usually just another connected device, sometimes with a recognisable camera-maker name or a label like “camera” or “IPC”. A device you cannot otherwise account for is the one to investigate.
Does a clean scan mean there are no cameras?
No. It rules out the common Wi-Fi camera on that network, but a camera on another network, on cellular, or recording offline would not show. Combine the scan with a physical check.
Is it legal to scan the Wi-Fi I am using?
Looking at the devices on a network you are legitimately connected to is a normal diagnostic step. This article is about protecting your own privacy as a guest, not accessing anything that is not yours.
To see every device on your home network, run a network scan from your phone: it lists each connected device with its IP address, name, and manufacturer in seconds. This lets you confirm what belongs on your network, spot anything unexpected, and keep your connection working for the devices that should be using it.
Knowing exactly what is connected to your WiFi serves three practical purposes. It protects your bandwidth, since every active device shares the same connection and an unknown one can quietly slow everything down. It protects your security, because a device you did not add may have joined with a leaked or guessed password. And it gives you an inventory, which is useful when you set up a new gadget, troubleshoot a problem, or simply want to understand your own network.
Most people are surprised by how many devices appear. A modern home easily runs phones, laptops, a TV, a streaming stick, a game console, smart bulbs, a thermostat, a doorbell, and more – often a dozen or more entries. Recognising them all is the first step to noticing the one that does not belong.
A scan works by checking your local network – the private range your router hands out, usually something like 192.168.0.x. The app reaches across that range, sees which addresses respond, and then gathers extra details about each device it finds, such as its name, type, and manufacturer.
What makes a dedicated scanner thorough is that it looks for devices in several different ways at once rather than relying on a single check. Devices vary in how readily they reveal themselves – a smart speaker, a printer, and a phone each answer some prompts and stay quiet to others – so a good scanner builds a far more complete and accurate list than a basic check. That is why it often finds devices your router’s own admin page misses.
The scan must run from a device on the same network, because private addresses are only reachable from inside that network. If results look incomplete, run it again with Deep Scan on – some devices respond slowly or only on a second pass. For the meaning of each result field, see the LAN Scanner help page.
The manufacturer is your best clue. Every network device has a MAC address, and the first half of that address is an identifier registered to the company that made the network chip – so the scanner can show “Apple”, “Samsung”, or “TP-Link” even when the device has no friendly name. A generic or blank hostname is common for smart-home gadgets and is not suspicious by itself; what matters is whether the manufacturer and device type make sense for something you own.
The process of elimination is the reliable way to identify a mystery entry: when you power a device off and its line vanishes from the next scan, you have named it. If an entry remains after everything you recognise is accounted for, treat it as unauthorised. The surest fix is to change your WiFi password – but be aware this disconnects every device at once, so afterwards you must reconnect and reconfigure each one you own (phones, TVs, smart-home gadgets, printers) with the new password and re-pair anything that syncs over the network. For routine bandwidth questions rather than security, see how to speed up your home WiFi.
Can I see who is on my WiFi without an app?
Your router’s admin page lists connected devices, but it is often slower to load and shows less detail. A scanner app adds manufacturer and device-type information and works the same way on any network you join.
What is a MAC address?
It is a unique hardware identifier assigned to each network adapter. Its first half identifies the manufacturer, which is how a scanner labels devices that have no readable name.
A device shows no name – is it dangerous?
Not necessarily. Many smart-home devices report a blank or cryptic hostname. Judge it by whether the manufacturer and type match something you actually own.
How often should I check?
A scan every few weeks, plus one whenever your internet feels slower than usual or right after guests visit, is enough for most homes.