MAC address 68:FF:7B details

Assigned Prefix
68:FF:7B

24-bit Prefix (MA-L)

Block Base Allocation
68:FF:7B:00:00:00

Hardware Interface 0x000000 (Min)

Block Top Boundary
68:FF:7B:FF:FF:FF

Hardware Interface 0xFFFFFF (Max)

Network Addressing & Host Scope

MA-L

This assignment represents an IEEE MA-L allocation, granting a dedicated boundary of 16,777,216 unique host MAC addresses.

START: 68:FF:7B:00:00:00 16,777,216 Total Addresses END: 68:FF:7B:FF:FF:FF
Lower Bound (Base Host 0) Upper Bound (Top Boundary)
IEEE Registry Tier MA-L Universally Administered (UAA)
Total Host Capacity 16,777,216 Exact binary space: 224 addresses
Derived IPv6 Link-Local SLAAC Base RFC 4291 EUI-64
fe80::6aff:7bff:fe00:0000

Base address derived from the allocation start, not a network prefix or a verified configured address. The link-local subnet is fe80::/64.

RFC 4291 (Modified EUI-64): This example derives an interface identifier from a 48-bit MAC address by inserting ff:fe and inverting the universal/local bit. An interface can use a different IPv6 identifier.

Octet & Bit Architecture

24-Bit Architecture
Allocation Spread 24-BIT PREFIX (50%) + 24-BIT HOST (50%)
24-Bit Prefix
24-Bit Host
Bit 0 [68:FF:7B]
Bit 24
Bit 47 [Host Top]

OUI / Prefix OUI means Organizationally Unique Identifier. MA-L uses a 24-bit prefix; MA-M and MA-S use 28-bit and 36-bit prefixes.

Host bits The remaining bits define the address space within the allocation.

Binary Octet Breakdown (Prefix)

Colored bits in Octet 0 (the first byte) match the I/G and U/L cards below. Octet indices start at zero.

Octet 0 68 0110 10 0 0
Octet 1 FF 1111 1111
Octet 2 7B 0111 1011
First octet, bit 1 (U/L) b1 = 0
Universally Administered (UAA)

Globally unique IEEE governed address.

First octet, bit 0 (I/G) b0 = 0
Unicast Transmission

Individual address destination (point-to-point transmission).

Wireshark Dissector Intel Matches Found
Display Filter: eth.addr[0:3] == 68:ff:7b
Vendor Tags: TpLinkTechnoTp-Link Technologies Co.,Ltd.

REST API v2

200 OK
CLI curl -s https://api.maclookup.app/v2/macs/68ff7b -H 'Accept: application/json'
{
  "success": true,
  "found": true,
  "macPrefix": "68FF7B",
  "company": "TP-LINK TECHNOLOGIES CO.,LTD.",
  "address": "Building 24(floors 1, 3, 4, 5)and 28(floors 1-4)Central Science and Technology Park, Shennan Road, Nanshan, Shenzhen Guangdong 518057, CN",
  "country": "CN",
  "blockStart": "68FF7B000000",
  "blockEnd": "68FF7BFFFFFF",
  "blockSize": 16777215,
  "blockType": "MA-L",
  "updated": "2018-11-16",
  "isRand": false,
  "isPrivate": false
}