Networking · 9 min read · April 28, 2026 · IPLocatorTools

MAC Address vs IP Address — What's the Difference?

MAC addresses and IP addresses both identify devices on networks but work completely differently. Here is exactly what each one does and why both matter.

If you have ever looked at your network settings, you have probably seen two different types of identifiers: an IP address and a MAC address. They look completely different, they work at different levels of the network stack, and they serve different purposes. Understanding the distinction helps you troubleshoot network problems, understand how your devices communicate, and make sense of network security concepts.

What is a MAC Address?

A MAC address (Media Access Control address) is a unique identifier permanently assigned to a network interface card (NIC) by its manufacturer. Every device that connects to a network — your laptop's Wi-Fi card, your phone's network chip, your router's ethernet ports — has a MAC address burned into its hardware at the factory.

A MAC address looks like this: 00:1A:2B:3C:4D:5E

Six groups of two hexadecimal digits separated by colons (or sometimes hyphens). Some systems display them without separators: 001A2B3C4D5E.

The first three groups (00:1A:2B) are called the OUI (Organizationally Unique Identifier) — they identify the manufacturer. The last three groups (3C:4D:5E) are assigned by the manufacturer to uniquely identify the specific device. This combination makes every MAC address globally unique — no two network interfaces should share the same MAC address.

Key characteristics of MAC addresses:

• Assigned at manufacturing time, stored in hardware
• Operates at Layer 2 (Data Link Layer) of the network model
• Used only within a local network segment — never routed across the internet
• 48 bits long (6 bytes), displayed in hexadecimal
• Also called a physical address, hardware address, or burned-in address

What is an IP Address?

An IP address (Internet Protocol address) is a logical address assigned to a device by the network it connects to. Unlike a MAC address (which is fixed in hardware), an IP address is assigned by software and can change depending on which network you are connected to.

An IPv4 address looks like this: 192.168.1.42 An IPv6 address looks like this: 2001:db8::1

Key characteristics of IP addresses:

• Assigned dynamically by a DHCP server (or manually configured)
• Operates at Layer 3 (Network Layer) of the network model
• Used for routing traffic across networks and the internet
• Changes when you connect to a different network
• Has two scopes: private (local network) and public (internet-facing)

You can see your current public IP address at IPLocatorTools.

The Core Difference: Local vs Global

This is the most important distinction:

MAC addresses work only on your local network segment. When your laptop sends data to your router, it uses MAC addresses. When your phone communicates with a smart speaker on the same Wi-Fi, MAC addresses are used. Once data crosses outside your local network — to the internet — MAC addresses are irrelevant. Routers strip the MAC address information when forwarding packets across network boundaries.

IP addresses work across the internet. When you request a webpage, your IP address travels with the request from your device, through your router, across your ISP's network, and to the destination web server. The web server uses your IP address to send the response back to you.

Think of it this way: your MAC address is like your name — it identifies you specifically. Your IP address is like your current mailing address — it tells the postal system where to deliver mail right now, but it changes if you move.

How They Work Together: ARP

When your device wants to send data to another device on the same local network, it needs to know that device's MAC address (for the local delivery) but only has its IP address. This is where ARP (Address Resolution Protocol) comes in.

ARP resolves IP addresses to MAC addresses within a local network:

1. Your device broadcasts an ARP request: "Who has IP address 192.168.1.1? Tell 192.168.1.42"
2. The device with that IP responds: "I have 192.168.1.1, my MAC address is 00:11:22:33:44:55"
3. Your device caches this mapping and uses the MAC address for local delivery

This ARP table (a mapping of IP addresses to MAC addresses) is maintained by every device on the network. You can see yours by running arp -a in Command Prompt (Windows) or Terminal (Mac/Linux).

Side-by-Side Comparison

| Feature | MAC Address | IP Address | |---------|-------------|------------| | Full name | Media Access Control | Internet Protocol | | Assigned by | Manufacturer (hardware) | Network/DHCP server (software) | | Changes? | No (usually fixed) | Yes (dynamic, or changes per network) | | Format | 00:1A:2B:3C:4D:5E (hex) | 192.168.1.1 (IPv4) or 2001:db8::1 (IPv6) | | Network layer | Layer 2 (Data Link) | Layer 3 (Network) | | Scope | Local network only | Local or global (internet) | | Purpose | Hardware identification | Logical addressing and routing | | Visible to websites? | No | Yes | | Used by internet routers? | No | Yes |

Why MAC Addresses Do Not Travel the Internet

Many people wonder: if MAC addresses are globally unique, why do websites not see your MAC address instead of your IP address?

The answer is how routing works. When a packet travels from your device to a website:

1. Your device sends the packet to your router using your router's MAC address (local delivery)
2. Your router strips the MAC address header and forwards the packet to the next hop using IP routing
3. At every hop across the internet, routers forward packets based purely on IP addresses
4. The destination web server receives a packet with your IP address — the original MAC address is long gone

MAC addresses only survive within a single network segment. Every time a packet crosses a router boundary, the MAC address is replaced with the MAC address of the next hop. By the time your data reaches a web server in another country, there is no trace of your original MAC address.

How to Find Your MAC Address

Windows

1. Press Windows + R, type cmd, press Enter
2. Type ipconfig /all and press Enter
3. Find your active network adapter (Wi-Fi or Ethernet)
4. Look for "Physical Address" — this is your MAC address

Or in PowerShell: Get-NetAdapter | Select-Object Name, MacAddress

Mac

1. Open System Settings → Network
2. Select your active connection → Details
3. Click the Hardware tab — your MAC address is shown as "MAC Address"

Or in Terminal: ifconfig | grep ether

iPhone

Settings → General → About → Wi-Fi Address

Android

Settings → About Phone → Status → Wi-Fi MAC Address (path varies by manufacturer)

Your Router's MAC Address

Your router has multiple MAC addresses — one for each network interface (WAN, LAN, Wi-Fi 2.4GHz, Wi-Fi 5GHz). Log into your router's admin panel (usually 192.168.1.1) to see all of them.

MAC Address Spoofing

Although MAC addresses are burned into hardware, software can override the address your device broadcasts — this is called MAC address spoofing.

Common uses:

• Privacy — Some operating systems (iOS, Android, Windows, macOS) randomise MAC addresses when scanning for Wi-Fi networks to prevent location tracking by Wi-Fi access points
• Network troubleshooting — Testing how a network behaves with a different hardware identity
• Bypassing MAC-based access controls — Some networks restrict access to known MAC addresses; spoofing a known MAC address bypasses this
• Security research — Testing network security configurations

Modern mobile operating systems use randomised MAC addresses by default when connecting to Wi-Fi networks as a privacy feature. This means the MAC address your router sees for your phone changes with each connection, preventing coffee shops and retailers from tracking your device across visits.

MAC Address Privacy Implications

While MAC addresses do not travel the internet, they do have privacy implications on local networks:

Wi-Fi tracking — Before MAC randomisation became standard, retail stores and venues used Wi-Fi probe requests (which include the device's MAC address) to track customer movement and dwell time. A customer's phone would emit probe requests searching for known networks, and sensors could track that specific MAC address as it moved through a store.

Network fingerprinting — Within your home network, your router logs which MAC addresses have connected. This is used for device management (assigning consistent IP addresses to specific devices) but could theoretically be used to track device usage.

Corporate network monitoring — In workplace networks, IT departments use MAC addresses for device inventory, network access control, and security monitoring.

IP Addresses and MAC Addresses in Security

DHCP reservation — You can configure your router to always assign the same IP address to a specific device based on its MAC address. This is called a DHCP reservation or static DHCP assignment. It gives a device a consistent private IP without manually configuring a static IP on the device itself.

MAC address filtering — Some routers offer MAC address filtering, which only allows devices with pre-approved MAC addresses to connect. This provides a weak security benefit — since MAC addresses can be spoofed, a determined attacker can clone an approved device's MAC address. It is useful as one layer of security but should not be relied upon alone.

ARP spoofing attacks — ARP has no authentication. A malicious device on a local network can broadcast false ARP responses, claiming to be another device (like the router). This is called an ARP spoofing or ARP poisoning attack and is used for man-in-the-middle attacks on local networks. This is one reason why networks with sensitive traffic should use network segmentation and encryption.

Frequently Asked Questions

Can someone find my MAC address from the internet? No. MAC addresses are stripped before data leaves your local network. The only people who can see your MAC address are devices and systems on your local network (your router, other devices on your Wi-Fi).

Does changing my IP address change my MAC address? No. They are completely independent. Your MAC address is fixed in your network hardware. Your IP address is assigned by software and changes independently.

Why does my IP address change but my MAC address stays the same? Your MAC address is a permanent hardware identifier set by the manufacturer. Your IP address is a temporary logical assignment made by your router's DHCP server, which may assign different addresses at different times.

Can websites ban me by MAC address? No. Websites only see your IP address, not your MAC address. IP bans are the mechanism websites use, not MAC bans.

What does the manufacturer OUI in a MAC address reveal? The first three bytes identify the manufacturer. You can look up any OUI in public databases to find which company made the network hardware. This is used for network inventory and security analysis. For example, if a corporate network sees an unknown device with an Apple OUI, IT knows it is an Apple product.

Related Tools

Check your public IP address (not your MAC address) at IPLocatorTools. Use the DNS Lookup tool for domain queries. Use Domain Tools for network and IP ownership lookups.