Your Wi-Fi password hasn’t changed since the technician set up your router. You gave it to your neighbour when their internet was down. You shared it with the plumber when he was working in the house for three days. Your kids have given it to friends who’ve come over, and those friends have given it to their phones, which have probably shared it with other devices automatically.
At some point — and it’s hard to say exactly when — your home network stopped being exclusively yours.
This isn’t a paranoid scenario. It’s the quiet reality of how home networks drift over time, and most people only notice it when their internet starts slowing down for no apparent reason.
What’s Actually on Your Network Right Now
According to research by Paessler, the average household now connects around 22 devices to their home network. That’s a lot of devices to keep track of — and a lot of opportunity for something to slip in that shouldn’t be there.
Unknown devices on a home network generally fall into three categories. The first is harmless: a device you forgot about, a smart plug you set up two years ago, a smart TV that appears under a cryptic manufacturer name. The second is inconvenient: a neighbour or former visitor whose phone still automatically connects whenever they’re in range. The third is a genuine security concern: someone who has deliberately accessed your network and is sitting on it without your knowledge.
The distinction matters. An old forgotten smart speaker isn’t a threat. An unknown device actively browsing your network traffic is a different matter entirely — and from the outside, they can look identical on your router’s device list.
Why It’s Not Just About Speed
Most people who discover an unknown device on their network are initially annoyed about one thing: their internet feels slower. And yes, extra devices consume bandwidth. But the security implications go further than that.
According to a 2024 IoT Security report conducted by Bitdefender and NETGEAR, home network devices see an average of 10 attacks every 24 hours. This isn’t theoretical — home networks are actively and continuously probed. An unauthorised device already inside your network is significantly more dangerous than an attack from outside it, because it sits behind your router’s defences rather than in front of them.
What can an uninvited device on your network do? Depending on how your network is configured, it could potentially see traffic from other devices on the same network, access shared files or printers, and observe which sites your devices are visiting. In a worst case — and this does happen — it could be used to intercept unencrypted communications.
Most of the time, the reality is less dramatic. It’s a neighbour downloading large files on your line, or an old device creating unnecessary load. But “usually harmless” isn’t a security policy.
How to Check Who’s on Your Network
The good news is that checking your network for unknown devices doesn’t require any technical expertise. Here’s how to do it:
Log into your router. On most home routers, you type 192.168.0.1 or 192.168.1.1 into a browser — the address is usually printed on a sticker on the router itself. From there, look for a section called “Connected Devices,” “DHCP Clients,” or “Device List.” This will show you every device currently connected.
Go through the list. Most devices show up with a name — “iPhone,” “Samsung TV,” “Andrew’s laptop.” Some show up with cryptic codes. For anything you don’t recognise, note the manufacturer listed alongside the device — this can help identify whether it’s a device you own (a smart home gadget from a brand you’ve forgotten about) or something genuinely unknown.
Use a free scanning app. Tools like Fing — available for free on iOS and Android — make this process much more visual and intuitive. It scans your network and gives you a clear list of every connected device with as much identification detail as it can find.
What to Do If You Find Something You Don’t Recognise
If you find a device you can’t identify:
Change your Wi-Fi password immediately. This boots every device off the network. Your own devices will reconnect once you enter the new password. Anything that shouldn’t be there won’t get back in.
Set up a guest network for visitors. Most modern routers support a separate guest network — a secondary Wi-Fi connection that gives internet access without access to the devices on your main network. This is how you give visitors connectivity without giving them permanent access to your home network.
Check your router password too. The login to your router’s admin panel is separate from your Wi-Fi password. If it’s still set to the factory default — which is often just “admin” and “password” — anyone who can reach your router can change your settings. Update it.
The Bigger Picture: Network Hygiene as a Habit
Checking what’s on your network isn’t something you do once and forget. It’s a reasonable habit — like checking that your doors are locked — to run every few months. Networks accumulate devices. Passwords get shared. Firmware goes out of date. A periodic check keeps things tidy.
The goal isn’t to become paranoid about your home network. It’s to know what’s on it — which is a reasonable thing for any household to want.
At Dial a Nerd, we can run a full home network audit, set up a secure guest network, and make sure your router is properly configured. If you’re not sure what’s on your network, we’ll find out — and sort it out.
