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Mac Address Validator - Free Online Tool

Last updated March 22, 2026

Validating a Standard MAC Address

Enter a MAC address to validate its format and structure:

Input: 00:1A:2B:3C:4D:5E

Validation Result: ✓ VALID

Details:
  Format: Colon-separated (Linux/macOS standard)
  Length: 12 hex digits (48 bits) ✓
  Characters: All valid hexadecimal ✓
  Type: Unicast (LSB of first octet = 0)
  Scope: Globally unique (bit 1 of first octet = 0)

OUI Lookup:
  OUI: 00:1A:2B
  Manufacturer: Cisco Systems, Inc.
  Location: San Jose, CA, US

Detecting Invalid MAC Addresses

The validator catches various types of errors:

Input: 00:1A:2B:3C:4D:5G

Result: ✗ INVALID
Error: Invalid hexadecimal character 'G' at position 17
Valid hex characters are: 0-9, A-F (case insensitive)

─────────────────────────────────────────────────────────────────────
Input: 00:1A:2B:3C:4D

Result: ✗ INVALID
Error: Incorrect length — found 10 hex digits, expected 12
A MAC address must be exactly 48 bits (12 hexadecimal digits)

─────────────────────────────────────────────────────────────────────
Input: 00:1A:2B:3C:4D:5E:6F

Result: ✗ INVALID
Error: Too many octets — found 7 groups, expected 6
A MAC address consists of exactly 6 octets

Identifying Special MAC Address Types

The validator identifies broadcast, multicast, and locally administered addresses:

Input: FF:FF:FF:FF:FF:FF

Result: ✓ VALID (Special address)
Type: BROADCAST
Description: Sent to all devices on the local network segment.
Not a unicast device address — do not use as a device identifier.

─────────────────────────────────────────────────────────────────────
Input: 01:00:5E:00:00:01

Result: ✓ VALID (Special address)
Type: MULTICAST (IPv4)
Description: IPv4 multicast address for group 224.0.0.1 (All Hosts)
LSB of first octet = 1 → multicast

─────────────────────────────────────────────────────────────────────
Input: 02:A4:7F:3B:9C:E1

Result: ✓ VALID
Type: Locally administered (not globally unique)
Description: Bit 1 of first octet is set — this is a locally
administered address, likely generated by software or OS
MAC randomization. Not assigned by a hardware manufacturer.

Batch Validation of Multiple Addresses

Validate a list of MAC addresses from a network scan or DHCP lease file:

Input (one per line):
00:1A:2B:3C:4D:5E
AA:BB:CC:DD:EE:FF
00-11-22-33-44-55
001A.2B3C.4D5E
INVALID_MAC
00:1A:2B:3C:4D
3C:22:FB:12:34:56

Batch Validation Results:
─────────────────────────────────────────────────────────────────────
✓ 00:1A:2B:3C:4D:5E  — Valid (Cisco Systems)
✓ AA:BB:CC:DD:EE:FF  — Valid (Unknown OUI)
✓ 00-11-22-33-44-55  — Valid (Windows format, Cimsys Inc.)
✓ 001A.2B3C.4D5E     — Valid (Cisco format, Cisco Systems)
✗ INVALID_MAC        — Invalid: not a MAC address format
✗ 00:1A:2B:3C:4D     — Invalid: only 5 octets (missing 1)
✓ 3C:22:FB:12:34:56  — Valid (Apple, Inc.)

Summary: 5 valid, 2 invalid

Validating All Common Formats

The validator accepts MAC addresses in any standard format:

All of these represent the same address and are all valid:

00:1A:2B:3C:4D:5E  ✓ Colon-separated (Linux/macOS)
00-1A-2B-3C-4D-5E  ✓ Hyphen-separated (Windows)
001A.2B3C.4D5E     ✓ Dot-separated (Cisco)
001A2B3C4D5E       ✓ No separator (raw hex)
00:1a:2b:3c:4d:5e  ✓ Lowercase colon
00-1a-2b-3c-4d-5e  ✓ Lowercase hyphen

OUI Manufacturer Identification

The validator identifies the manufacturer for any valid MAC address:

MAC: 3C:22:FB:12:34:56
  OUI: 3C:22:FB → Apple, Inc.

MAC: 00:50:56:AA:BB:CC
  OUI: 00:50:56 → VMware, Inc.

MAC: B8:27:EB:12:34:56
  OUI: B8:27:EB → Raspberry Pi Foundation

MAC: DC:A6:32:12:34:56
  OUI: DC:A6:32 → Raspberry Pi Trading Ltd

MAC: 00:0C:29:12:34:56
  OUI: 00:0C:29 → VMware, Inc. (virtual machines)

MAC: 08:00:27:12:34:56
  OUI: 08:00:27 → PCS Systemtechnik GmbH (VirtualBox)

Detecting MAC Address Randomization

Identify whether a MAC address is a real hardware address or a randomized one:

Input: 02:A4:7F:3B:9C:E1

Analysis:
  First octet: 02 = 0000 0010
  Bit 0 (LSB): 0 → Unicast ✓
  Bit 1: 1 → Locally administered

Result: This is a LOCALLY ADMINISTERED address.
It was likely generated by OS MAC randomization
(iOS, Android, Windows 10+, macOS Catalina+).

Implication for network access control:
  This device is using MAC randomization. If your network
  uses MAC-based access control, this device may appear
  as a new unknown device on each connection.
  Consider using 802.1X authentication instead.

Validating for DHCP Reservation

Validate a MAC address before adding it to a DHCP reservation:

Input: 00:1A:2B:3C:4D:5E

Pre-reservation validation:
  ✓ Valid format
  ✓ Correct length (48 bits)
  ✓ Valid hex characters
  ✓ Unicast address (can be used as device identifier)
  ✓ Globally unique (hardware-assigned, not randomized)
  ✓ Manufacturer: Cisco Systems, Inc.

Safe to add as DHCP reservation.

Generated reservation entries:
  Windows DHCP: 001A2B3C4D5E
  Linux dhcpd:  00:1a:2b:3c:4d:5e
  Cisco IOS:    001a.2b3c.4d5e

MAC Address Validator Free Online Tool 2026

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