The Quick Answer
An IP address identifies your connection to the internet. It is assigned by your network router or ISP and changes depending on where you connect.
A MAC address (Media Access Control) identifies your physical device hardware. It is permanently burned into your network card by the manufacturer and never changes (unless spoofed).
Think of it like the postal system:
- MAC Address: Your physical house (the permanent structure)
- IP Address: Your street address (can change if the city rezones, or if you move)
What is a MAC Address?
Every piece of hardware that connects to a network (Wi-Fi card, Ethernet port, Bluetooth chip) has a unique 48-bit identifier called a MAC address.
It looks like this: 00:1A:2B:3C:4D:5E
Key characteristics of MAC addresses:
- Permanent: Assigned at the factory.
- Local only: MAC addresses are only used on your local network (LAN). Once your traffic hits your router and goes out to the internet, your MAC address is stripped away.
- Format: 6 pairs of hexadecimal digits.
What is an IP Address?
An IP address (Internet Protocol) is a logical address used to route data across networks and the internet.
It looks like this: 192.168.1.5 (IPv4) or 2001:0db8:85a3:0000:0000:8a2e:0370:7334 (IPv6).
Key characteristics of IP addresses:
- Dynamic: Your IP address changes when you move from your home Wi-Fi to a coffee shop Wi-Fi.
- Global (Public IPs): Public IP addresses are routed across the entire global internet.
- Hierarchical: IP addresses are grouped into blocks and subnets, allowing routers to know which general direction to send data.
How They Work Together (ARP)
When you type a website address into your browser, your computer needs to send a request to your router.
- Your computer knows the router's IP address (usually
192.168.1.1). - But to physically send the data packet over the Wi-Fi or Ethernet cable, it needs the router's MAC address.
- Your computer uses ARP (Address Resolution Protocol) to shout on the local network: "Who has IP 192.168.1.1? Tell me your MAC address!"
- The router replies with its MAC address.
- Your computer can now package the data and send it.
Can Someone Track Me Using My MAC Address?
On the internet? No. Websites you visit (like Facebook, Google, or our IP Lookup tool) can never see your MAC address. They only see your public IP address. Your router strips your MAC address off the data packets before sending them to the internet.
Locally? Yes. If you connect to a public Wi-Fi network at an airport or coffee shop, the network administrator can see your MAC address.
To protect your privacy, modern smartphones (iOS and Android) and operating systems (Windows 11) use MAC Randomization. They generate a fake, temporary MAC address when connecting to public networks so you cannot be tracked across different locations.
Summary
Both MAC and IP addresses are essential for networking. MAC addresses handle the physical, local delivery of data (like handing a letter to your neighbor). IP addresses handle the logical, global delivery of data (like mailing a letter across the world).
To learn more about your network connection, check out our guide on Public vs Private IP Addresses or see what your current public IP is using our What's My IP tool.