What Is a MAC Address? Find It on Any Device
A MAC address is the hardware ID of your network adapter. Here is what it does, how it differs from an IP, and how to find it.
A MAC address (Media Access Control address) is a hardware identifier built into every network adapter, WiFi or Ethernet. It looks like 3C:22:FB:9A:10:4E: six pairs of letters and numbers.
A MAC address is a hardware identifier built into every network adapter. It looks like six pairs of letters and numbers, such as 3C:22:FB:9A:10:4E.
Your router uses it to recognize devices on the local network. This guide explains what it is, how it differs from an IP address and how to find it.
MAC address vs IP address
| MAC address | IP address | |
|---|---|---|
| Identifies | The network adapter | The device on a network |
| Format | 3C:22:FB:9A:10:4E | 192.168.1.25 |
| Set by | Manufacturer (or randomized) | Router or ISP |
| Scope | Local network only | Local or internet |
| Changes | Rarely, except private MAC | Often, with DHCP |
When I explain the difference, the scope row is the one that makes it click.
What a MAC address is used for
- DHCP reservations: give a device the same IP every time.
- MAC filtering: allow or block devices on the router.
- Parental controls: identify a child device.
- Network troubleshooting: tell devices apart in the router list.
DHCP reservations are the use I come back to most, since a fixed address keeps everything else simple.
Private or random MAC addresses
iPhone, Android and Windows can use a private MAC for each WiFi network, which stops tracking across hotspots. At home it can confuse reservations and parental controls. I keep private MAC on for public WiFi and switch it off at home.
You can turn it off per network: iPhone Settings, Wi-Fi, (i), Private Wi-Fi Address. Android: WiFi network, Privacy, Use device MAC.
How to find your MAC address
- Windows: run
ipconfig /alland read Physical Address. - Mac: System Settings, Network, your connection, Details, Hardware.
- iPhone: Settings, General, About, Wi-Fi Address.
- Android: Settings, About phone, Status, Wi-Fi MAC address.
- Router: the connected devices list shows every MAC on your network.
My first stop is the router’s device list, since it shows every MAC in one place.
Is MAC filtering good security?
Not on its own. MAC addresses are visible in the air and easy to copy. Use WPA2 or WPA3 with a strong password, and treat MAC filtering as an extra layer only. I treat it as a convenience, never as a lock.
Reading a MAC address
A MAC address is six pairs of characters, like A4:83:E7:1C:2B:9F. The first three pairs usually identify the maker of the network chip, and the last three identify the individual device. I read the first half first, since that is the part that names the maker.
That’s how router apps sometimes guess a device is “Apple” or “Samsung” even before you rename it. With private MAC addresses turned on, phones use a random first half, so the maker guess may be blank or wrong.
Turn private MAC off for one network
- iPhone: Settings, WiFi, tap (i), turn off Private WiFi Address (or set it to Off on iOS 18).
- Android: tap the network, Privacy or MAC address type, choose Use device MAC.
- Windows: Settings, Network & internet, WiFi, Random hardware addresses.
Only do this on your own home network if a router feature, like MAC filtering or a DHCP reservation, needs the real address. I leave it on everywhere except my own network, where a reservation needs the real address.
Where MAC addresses show up in daily life
- Router device lists: each connected device is listed by MAC, which is how routers tell them apart.
- DHCP reservations: the router links a fixed IP to a MAC address.
- Parental controls: schedules and blocks often target a device’s MAC.
- ISP activation: cable providers register your modem’s MAC to your account.
- Hotel and campus WiFi: some sign-in systems remember your device by MAC.
That’s why switching on private MAC can sometimes make a device lose its reserved IP or parental control rule. If something stops working after a phone update, check whether its MAC changed. I have seen a phone update break a reservation this way.
MAC address vs serial number
A device can have several MAC addresses, one for each network interface: WiFi, Ethernet and Bluetooth each have their own. A serial number, on the other hand, identifies the whole device for warranty and support. When a form asks for a MAC, make sure you copy the one for the connection you’re actually using.
When a form asks for a MAC, I check the connection first, since each one has its own address.
Can MAC addresses identify a device brand?
Yes, usually. The first half of a real MAC address (the OUI) is assigned to the manufacturer, so online lookup tools can tell you whether a device is made by Apple, Samsung, Espressif (common in smart plugs) and so on.
That’s a handy trick for identifying unknown devices in your router’s list, though it won’t work for phones using private MACs.
I use this trick whenever a mystery device shows up on my network.
