Network & IP Tool
Identify the vendor behind any MAC address. Paste any format — colon, hyphen or plain hex — and the tool returns the OUI prefix, manufacturer name, address type and administration scope.
Quick Answer
Enter a full or partial MAC address in any standard format. The calculator normalises it and looks up the IEEE OUI prefix to return the registered vendor name, address type and scope.
Inputs
Paste a MAC in any format. Results replace this view after lookup.
00:1A:2B:3C:4D:5E, hyphens 00-1A-2B-3C-4D-5E, dots 001A.2B3C.4D5E or plain hex 001A2B3C4D5E. Only the first 6 hex digits (OUI) are needed for vendor lookup.Method
Every IEEE-registered MAC address begins with a 24-bit Organizationally Unique Identifier (OUI) assigned to the hardware manufacturer. This tool normalises the entered address and compares the first three bytes against a bundled OUI table to return the registered vendor name.
Inputs
Enter any full or partial MAC address. At least six hex characters (the OUI) are required for vendor identification. The full 12-character address unlocks type and scope analysis.
Uses
Useful for network inventory, ARP table analysis, switch port security, rogue device detection, DHCP lease review and physical asset identification during site audits.
FAQ
An Organizationally Unique Identifier is the first 24 bits (three bytes) of a MAC address, assigned by the IEEE to hardware manufacturers. It uniquely identifies the company that produced the network interface.
This tool bundles a curated OUI table covering the most common manufacturers. Some OUIs — especially recently assigned ones, private ranges or virtualisation vendors — may not be included. Check the IEEE OUI registry for the full database.
Bit 1 of the first byte indicates whether the address was assigned by the manufacturer (globally administered) or manually set/randomised by software (locally administered). Many modern operating systems randomise MAC addresses for privacy.
Bit 0 of the first byte marks the address as multicast (1) or unicast (0). Multicast MACs are used to deliver frames to a group of devices simultaneously — for example, IGMP or spanning tree protocol traffic.
Learn More
Project
For network audits, switch port documentation, MAC-based access control and structured cabling handover records, ITCOREOPS can help.
Disclaimer
OUI assignments change over time and manufacturers may reuse prefixes across product lines. This tool uses a bundled table and may not reflect the latest IEEE registry. Always verify against the official IEEE OUI database for security-critical decisions.
Related
Use the IP Subnet Calculator to define network ranges, usable host counts and broadcast addresses before documenting your VLAN or firewall rules.
Support
For network documentation, rack environments, structured cabling and DCIM workflows, visit ITCOREOPS.
Feedback
Report lookup errors, missing vendors, display problems or suggestions for improving this tool.
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