MAC 주소 생성기
테스트 및 개발용 랜덤 MAC 주소를 생성합니다
다음 단계
관련된 다음 작업으로 흐름을 이어가세요.
Privacy & Trust
생성
Addresses are generated with `crypto.getRandomValues`, not predictable math-based randomness.
유니캐스트만
Optionally clear the multicast bit for interface-style test addresses.
로컬 관리
Set the locally administered bit when you need synthetic, non-vendor hardware identifiers.
생성된 MAC 주소
Generate at least one address to enable export.
사용 방법
값 입력
입력 필드에 숫자나 매개변수를 입력하세요.
즉시 결과 확인
입력하는 즉시 결과가 자동으로 업데이트됩니다 — 제출 버튼이 필요 없습니다.
복사 또는 저장
결과를 클립보드에 복사하거나 작업 흐름에 활용하세요.
이 도구를 사용하는 이유
100% 무료
숨겨진 비용도, 프리미엄 등급도 없습니다 — 모든 기능이 무료입니다.
설치 불필요
브라우저에서 완전히 실행됩니다. 소프트웨어를 다운로드하거나 설치할 필요가 없습니다.
프라이빗 & 안전
데이터가 기기 밖으로 나가지 않습니다. 어떤 서버에도 업로드되지 않습니다.
모바일 지원
완전 반응형 — 스마트폰, 태블릿, 데스크톱에서 사용할 수 있습니다.
MAC Addresses: Hardware Identification in Networks
Key Takeaways
- MAC (Media Access Control) addresses are 48-bit hardware identifiers assigned to network interface cards for Layer 2 communication.
- The first 3 bytes (OUI) identify the manufacturer, while the last 3 bytes are device-specific — except in randomly generated addresses.
- All MAC address generation is performed in your browser — no addresses are stored or transmitted.
MAC addresses are the physical identity of network devices, operating at Layer 2 of the OSI model. Every Ethernet frame and WiFi packet uses MAC addresses for local network delivery. Understanding MAC address structure is essential for network administration, security (MAC filtering), virtualization (VM network config), and troubleshooting connectivity issues at the data link layer.
The 48-bit MAC address space supports 281 trillion unique addresses — enough for every networked device on Earth.
Address Space
Key Concepts
MAC Address Structure
A MAC address has 6 octets (e.g., AA:BB:CC:DD:EE:FF). The first 3 octets form the OUI (Organizationally Unique Identifier) assigned to manufacturers. The last 3 are device-specific.
Unicast vs. Multicast Bit
The least significant bit of the first octet determines if the address is unicast (0, single device) or multicast (1, group of devices). Randomly generated addresses should set this bit to 0.
Local vs. Universal Bit
The second least significant bit of the first octet indicates whether the address is universally administered (0, manufacturer-assigned) or locally administered (1, custom/random).
MAC Address Randomization
Modern operating systems (iOS, Android, Windows) randomize MAC addresses when scanning for WiFi networks to prevent tracking. This uses the locally administered bit to distinguish from real hardware addresses.
Pro Tips
Set the locally administered bit (second-least significant bit of first octet) when generating random MAC addresses to avoid conflicting with real hardware.
Use consistent MAC addresses for VMs and containers in development to avoid DHCP lease issues when recreating environments.
MAC filtering provides minimal security — MAC addresses can be easily spoofed. Use 802.1X authentication for real network access control.
Common MAC address formats include colon-separated (AA:BB:CC:DD:EE:FF), hyphen-separated (AA-BB-CC-DD-EE-FF), and Cisco format (AABB.CCDD.EEFF).
All MAC address generation is performed entirely in your browser. No generated addresses are stored, logged, or transmitted to any server. Generated addresses are random and not associated with any real hardware.