MAC Address Formatter Free Online Tool 2026

Last updated March 22, 2026

Converting Between Common MAC Address Formats

The same MAC address in all four common formats:

Input: 00:1A:2B:3C:4D:5E (Linux/macOS colon format)

Output in all formats:
─────────────────────────────────────────────────────────────────────
Colon-separated (Linux/macOS):  00:1A:2B:3C:4D:5E
Hyphen-separated (Windows):     00-1A-2B-3C-4D-5E
Dot-separated (Cisco):          001A.2B3C.4D5E
No separator (raw hex):         001A2B3C4D5E
Lowercase colon:                00:1a:2b:3c:4d:5e

Windows to Linux Format Conversion

Convert a MAC address from Windows Device Manager format to Linux format for use in iptables or network configuration:

Input (Windows format):  00-1A-2B-3C-4D-5E
Target format: Linux colon-separated

Output: 00:1A:2B:3C:4D:5E

Use in Linux iptables:
iptables -A INPUT -m mac --mac-source 00:1A:2B:3C:4D:5E -j ACCEPT

Cisco Dot Notation Conversion

Convert a MAC address from Cisco IOS format to standard colon format:

Input (Cisco format):  001A.2B3C.4D5E
Target format: Colon-separated

Output: 00:1A:2B:3C:4D:5E

Use in Cisco ACL:
mac access-list extended ALLOW-DEVICE
  permit host 001A.2B3C.4D5E any

Batch Conversion of Multiple MAC Addresses

Convert a list of MAC addresses from mixed formats to a consistent format. Input (mixed formats):

00-1A-2B-3C-4D-5E
aa:bb:cc:dd:ee:ff
001A.2B3C.4D5E
001A2B3C4D5F
00:11:22:33:44:55

Settings: Convert all to uppercase colon-separated format

Output:

00:1A:2B:3C:4D:5E
AA:BB:CC:DD:EE:FF
00:1A:2B:3C:4D:5E
00:1A:2B:3C:4D:5F
00:11:22:33:44:55

OUI Manufacturer Lookup

After formatting, the tool identifies the manufacturer from the OUI prefix:

MAC Address: 00:1A:2B:3C:4D:5E

OUI Lookup:
  OUI: 00:1A:2B
  Manufacturer: Cisco Systems, Inc.
  Address: San Jose, CA, US
  Assignment type: MA-L (MAC Address Large)

MAC Address: 3C:22:FB:12:34:56

OUI Lookup:
  OUI: 3C:22:FB
  Manufacturer: Apple, Inc.
  Address: Cupertino, CA, US

Case Conversion

Some systems require uppercase hex digits, others lowercase:

Input: aa:bb:cc:dd:ee:ff (lowercase)

Uppercase output: AA:BB:CC:DD:EE:FF
Lowercase output: aa:bb:cc:dd:ee:ff

Use case: Windows DHCP reservations require uppercase.
Linux systems typically use lowercase.
Cisco IOS uses uppercase without separators in some contexts.

IPv6 EUI-64 Address Generation

Generate the IPv6 link-local address from a MAC address using the EUI-64 process:

MAC Address: 00:1A:2B:3C:4D:5E

EUI-64 Process:
1. Split MAC in half: 00:1A:2B | 3C:4D:5E
2. Insert FF:FE in middle: 00:1A:2B:FF:FE:3C:4D:5E
3. Flip universal/local bit (bit 7 of first octet):
   00 = 0000 0000 → flip bit 7 → 0000 0010 = 02
4. Result: 02:1A:2B:FF:FE:3C:4D:5E

IPv6 Link-Local Address: fe80::021a:2bff:fe3c:4d5e/64

Use in network planning:
  This is the link-local address the device will use
  for IPv6 neighbor discovery on the local network segment.

DHCP Reservation Format

Generate MAC address entries in the format required for DHCP reservations:

MAC Address: 00:1A:2B:3C:4D:5E

Windows DHCP Server (PowerShell):
Add-DhcpServerv4Reservation -ScopeId 192.168.1.0 `
  -IPAddress 192.168.1.100 `
  -ClientId "001A2B3C4D5E" `
  -Description "Printer-Floor2"

Linux ISC DHCP (dhcpd.conf):
host printer-floor2 {
  hardware ethernet 00:1a:2b:3c:4d:5e;
  fixed-address 192.168.1.100;
}

Cisco IOS:
ip dhcp pool PRINTER-FLOOR2
  host 192.168.1.100 255.255.255.0
  client-identifier 001a.2b3c.4d5e