Free tool
NetworkingMAC Address Lookup
Look up the manufacturer of any device from its MAC address. Free, instant OUI lookup tool, useful for network troubleshooting and security audits.
Runs in your browser — your data stays on your device
Free toolEvery network interface has a MAC address burned in at manufacture, and the first half of that address identifies who made it. This is called the OUI (Organisationally Unique Identifier). Paste in a MAC address and this tool tells you the registered manufacturer instantly.
How to use the MAC address lookup tool
- 1
Find the MAC address you want to check, for example from your router's connected devices list or a switch MAC address table.
- 2
Enter it in any common format, with colons, hyphens, or no separators at all.
- 3
The tool returns the manufacturer registered to that address block.
Why MAC lookups matter for network admins and students
A MAC address is structured in two halves: the first 24 bits (the OUI) identify the manufacturer, and the last 24 bits are a unique identifier assigned by that manufacturer. When you're troubleshooting a network and see an unfamiliar device, checking the OUI tells you immediately whether you're looking at an Apple device, a Cisco switch, or a Raspberry Pi.
Worked example
A MAC address like 3C:5A:B4:12:34:56 has an OUI of 3C:5A:B4. Looking that block up tells you which manufacturer registered it with the IEEE, which, combined with other clues like open ports or hostname, helps you identify unknown devices during a network audit.
Guides and next steps
Privacy note
MAC lookups use a local OUI database loaded into your browser. Addresses you search are not sent to our servers or logged.
Frequently asked questions
Explore more
Related free tools
More subnetting and IP addressing calculators for CCNA practice, Cisco labs, and day-to-day admin work.
IPv6 EUI-64
Free IPv6 to EUI-64 calculator. Convert a MAC address to modified EUI-64, build the fe80:: link-local address, or pull the interface ID out of an IPv6 address, CCNA-friendly and runs in your browser.
Open toolIP Converter
Convert any IPv4 address between decimal, binary, and hexadecimal instantly. Free browser-based tool for subnetting practice and networking students.
Open toolWildcard Mask Calculator
Free online wildcard mask calculator for CCNA students and Cisco networking. Convert subnet mask or CIDR to a wildcard mask and see ACL/OSPF examples.
Open toolIPv4 Subnet Calculator
Free online IPv4 subnet calculator for CCNA students and network engineers. Enter an IP with CIDR or mask to get network, broadcast, and usable host ranges.
Open toolCIDR Calculator
Free online CIDR calculator for beginners, CCNA students, and network engineers. Enter IPv4 CIDR notation to get subnet mask, network, broadcast, and usable hosts.
Open toolNetwork Address Calculator
Free network address calculator for CCNA and IT students. Enter an IPv4 address and mask or CIDR to find the network ID, and see how it differs from host addresses.
Open toolReady to go beyond free tools?
Live mentor-led courses turn calculator practice into real networking and IT skill.