MAC Address vs IP Address: Hardware Identity vs Network Location

Sat, 01 Aug 2026 20:11:00 +0900

Overview

A MAC address is a hardware identifier burned into a network interface card and used to move frames across a single local link. An IP address is a logical network address assigned to a device and used to route packets across interconnected networks, including the internet. They operate at different OSI layers, working together to get data from one physical wire to a destination anywhere in the world.

Comparison Diagram

Comparison Table

Aspect	MAC Address	IP Address
OSI layer	Layer 2 (Data Link)	Layer 3 (Network)
Format	48-bit hex, e.g. 00:1A:2B:3C:4D:5E	32-bit (IPv4) or 128-bit (IPv6) dotted/colon notation
Assignment	Burned in by the NIC manufacturer at production	Assigned by a network admin or DHCP server
Structure	Flat, no hierarchy — vendor prefix plus serial	Hierarchical — network portion plus host portion for routing
Persistence	Fixed to the physical interface (though spoofable)	Can change when a device moves to a different network
Role in delivery	Identifies the next-hop device on the local link	Identifies source and destination across the whole path
Behavior across hops	Rewritten by every router at each hop	Preserved end-to-end (barring NAT)
Resolution mechanism	Discovered via ARP (IPv4) or NDP (IPv6)	Discovered via DNS for hostnames

Key Differences

MAC address operates at Layer 2 while IP address operates at Layer 3.
MAC is burned into hardware by the manufacturer, whereas IP is assigned by the network.
A frame’s MAC addresses are rewritten at every hop, but the packet’s IP addresses stay end-to-end constant.
ARP maps an IP address to the MAC address needed for delivery on the local segment.
MAC addresses are flat with no structure, while IP addresses are hierarchical to support routing.

When to Use Each

MAC Address

Mac-Address on IT Comparison

MAC Address vs IP Address: Hardware Identity vs Network Location

Overview

Comparison Diagram

Comparison Table

Key Differences

When to Use Each