MAC Address Formatter & OUI Vendor Inspector
OUI LookupFormat MAC addresses and identify hardware manufacturers using an in-browser IEEE Organizationally Unique Identifier (OUI) database. Standardize MAC strings between colons, hyphens, and Cisco dot notation, inspect multicast/unicast bit flags, and validate hardware addresses with zero cloud uploads.
MAC Address Formatter & OUI Vendor Inspector
Format single and bulk MAC addresses to Cisco, colon, hyphen, or bare hex notation and lookup hardware vendors.
Interactive MAC Address Formatter & OUI Vendor Inspector Workspace
Sanitize, normalize, and format single or bulk MAC addresses into Cisco (xxxx.xxxx.xxxx), standard colon (xx:xx:xx:xx:xx:xx), or hyphen formats. Inspect hardware manufacturer OUI vendor data, multicast bits, and local administration flags in memory.
How This Tool Works (100% Client-Side Engine)
The tool strips non-hexadecimal characters using regex ([^0-9A-Fa-f]) and validates a 12-character hex sequence (48 bits). It inspects the first octet least significant bits to determine Unicast vs. Multicast (b0) and Universally vs. Locally Administered (b1). The first 24 bits (6 hex chars) are queried against an in-memory IEEE OUI database to resolve vendor identity.
Step-by-Step Guide
Paste MAC Address
Enter or paste any MAC address in any format (e.g. 00:1A:2B:3C:4D:5E or 001a.2b3c.4d5e).
Review Formats & Vendor Information
Inspect the standardized output in Colons, Hyphens, Cisco Dots, and Raw Hex, alongside detected vendor manufacturer.
Copy Desired Format
Click Copy next to your desired format for immediate pasting into your router or firewall configuration.
Why Use This Tool: Privacy & Performance
Network engineers and IT administrators frequently handle Media Access Control (MAC) addresses exported from diverse systems: switches outputting Cisco triple-dot format (0011.2233.4455), Linux tools using standard colons (00:11:22:33:44:55), Windows outputs using hyphens (00-11-22-33-44-55), or raw hexadecimal strings (001122334455). Standardizing these formats for DHCP static reservations, RADIUS authentication policies, or firewall white-lists is tedious. Furthermore, identifying the manufacturer of an unknown device connected to a switch port requires querying IEEE OUI registries. ToolByte MAC Address Formatter & OUI Inspector cleans and formats MAC addresses instantly. It converts between all standard notations, identifies the registered hardware vendor (Apple, Cisco, Intel, Samsung, Dell) using a local IEEE database, and decodes unicast/multicast and universally/locally administered bits with complete privacy.
Common Use Cases & Workflows
Standardizing MACs for DHCP Reservations
Convert mixed hyphen and dot formatted MAC addresses into standard colon notation for router DHCP static leases.
Identifying Rogue Devices on Switch Ports
Inspect unknown MAC addresses found in ARP tables to identify whether the connected device is an HP printer, Dell server, or Apple iPhone.
Configuring Cisco Network Equipment
Transform standard colon-delimited MAC strings into Cisco triple-dot format (xxxx.xxxx.xxxx) for switchport security commands.
Decoding Locally Administered MAC Addresses
Check whether a MAC address is a globally burned-in manufacturer address or a randomized private MAC generated by modern smartphones.
Technical Limitations & Operational Boundaries
Frequently Asked Questions
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