Random MAC Address Generator

How to use

1. 1️⃣
   Choose your options above
2. 2️⃣
   Click Generate
3. 3️⃣
   Copy your result

Detailed instructions

1. Set the count field to how many MAC addresses you need, from 1 up to the maximum.
2. Choose a format (colon, dash, dot, or plain) that matches your target platform or config file syntax.
3. Select a vendor prefix if you need OUI-specific addresses, or leave it on random for fully arbitrary output.
4. Click Generate to produce the batch of addresses.
5. Copy individual addresses or the full list and paste them into your config file, test fixture, or code.

Use Cases

• •Populating ARP table fixtures for network protocol unit tests in Python or Go
• •Assigning custom MACs to virtual NICs in VMware, VirtualBox, or Hyper-V
• •Testing MAC-based ACLs on managed switches with vendor-specific OUI addresses
• •Generating Cisco dot-notation addresses for IOS configuration scripts and GNS3 labs
• •Seeding a Postgres or MongoDB dev database with realistic device identifiers for demo UIs

Tips

• →Use the Cisco dot format when copying addresses directly into IOS show commands or expect scripts to avoid manual reformatting.
• →When testing OUI lookup libraries, generate addresses from several different vendors in one session to cover multiple lookup paths.
• →For VM labs with multiple nodes, generate the full batch at once rather than one at a time to ensure no accidental duplicates.
• →The plain (no separator) format is easiest to parse programmatically; use it when feeding addresses into scripts or test fixtures.
• →Locally administered bit: if your test checks the LA bit, confirm the first octet manually — random generation doesn't guarantee a specific value.
• →Generate more addresses than you need (e.g., 20 instead of 10) and keep a few in reserve for expanding your lab topology later.

FAQ