MAC Address Analyzer: Decode & Identify Manufacturer
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About MAC Address Analyzer
The MAC Address Analyzer is a comprehensive tool for decoding, validating, and analyzing MAC (Media Access Control) addresses. Enter any MAC address to instantly identify the manufacturer, determine address type (unicast/multicast), check administration status (UAA/LAA), and view detailed binary breakdowns with format conversions.
What is a MAC Address?
A MAC address (Media Access Control address) is a unique 48-bit identifier assigned to network interface controllers (NICs) for communications on the physical network segment. It operates at the Data Link Layer (Layer 2) of the OSI model and is essential for local network communication.
MAC Address Structure
A MAC address consists of 6 octets (48 bits) typically displayed in hexadecimal format:
| Component | Bits | Description |
|---|---|---|
| OUI | Bits 0-23 | Organizationally Unique Identifier - identifies the manufacturer (first 3 octets) |
| NIC | Bits 24-47 | Network Interface Controller specific - unique device identifier (last 3 octets) |
Special Bits in the First Octet
The first octet contains two important flag bits:
| Bit | Value 0 | Value 1 |
|---|---|---|
| Bit 0 (LSB) | Unicast address | Multicast address |
| Bit 1 | Universally Administered (UAA) | Locally Administered (LAA) |
MAC Address Formats
MAC addresses can be written in several formats:
| Format | Example | Common Use |
|---|---|---|
| Colon-separated | 00:1A:2B:3C:4D:5E | Linux, macOS |
| Hyphen-separated | 00-1A-2B-3C-4D-5E | Windows |
| Dot-separated | 001A.2B3C.4D5E | Cisco devices |
| Plain | 001A2B3C4D5E | Programming, databases |
How to Use This Tool
- Enter a MAC address: Input the address in any common format (colon, hyphen, dot, or plain hex).
- Click Analyze: The tool validates and processes the address.
- Review results: View manufacturer info, address properties, structure breakdown, and format variants.
- Copy formats: Use the copy buttons to copy any format variant to your clipboard.
Understanding Unicast vs Multicast
- Unicast: Addresses a single network interface. Used for one-to-one communication between devices.
- Multicast: Addresses a group of devices. Used for one-to-many communication like streaming or network protocols.
- Broadcast: A special multicast address (FF:FF:FF:FF:FF:FF) that reaches all devices on the network segment.
UAA vs LAA Addresses
- UAA (Universally Administered Address): Assigned by the manufacturer and registered with IEEE. Guaranteed globally unique.
- LAA (Locally Administered Address): Assigned by network administrators or software. Common in virtual machines, containers, and privacy features.
Frequently Asked Questions
What is a MAC address?
A MAC (Media Access Control) address is a unique 48-bit identifier assigned to network interface cards. It consists of 6 octets (12 hexadecimal digits) and is used for communication on the physical network segment. The first 3 octets (OUI) identify the manufacturer, while the last 3 octets (NIC) are unique to the device.
What is the difference between OUI and NIC in a MAC address?
OUI (Organizationally Unique Identifier) is the first 24 bits (3 octets) of a MAC address, assigned by IEEE to identify the manufacturer. NIC (Network Interface Controller) specific portion is the last 24 bits (3 octets), uniquely assigned by the manufacturer to each device.
What is the difference between unicast and multicast MAC addresses?
A unicast MAC address identifies a single network interface and is used for one-to-one communication. A multicast address is used to send data to multiple devices simultaneously. The least significant bit of the first octet determines this: 0 for unicast, 1 for multicast.
What does UAA and LAA mean for MAC addresses?
UAA (Universally Administered Address) is assigned by the manufacturer and registered with IEEE, ensuring global uniqueness. LAA (Locally Administered Address) is assigned by a network administrator or software, overriding the burned-in address. The second bit of the first octet indicates this: 0 for UAA, 1 for LAA.
What MAC address formats are supported?
This tool supports all common MAC address formats including colon-separated (00:1A:2B:3C:4D:5E), hyphen-separated (00-1A-2B-3C-4D-5E), dot-separated Cisco format (001A.2B3C.4D5E), and plain hexadecimal (001A2B3C4D5E). Both uppercase and lowercase are accepted.
Additional Resources
Reference this content, page, or tool as:
"MAC Address Analyzer" at https://MiniWebtool.com/mac-address-analyzer/ from MiniWebtool, https://MiniWebtool.com/
by miniwebtool team. Updated: Jan 18, 2026