MAC address 74:25:84:D details

Assigned Prefix
74:25:84:D

28-bit Prefix (MA-M)

Block Base Allocation
74:25:84:D0:00:00

Hardware Interface 0x00000 (Min)

Block Top Boundary
74:25:84:DF:FF:FF

Hardware Interface 0xFFFFF (Max)

Network Addressing & Host Scope

MA-M

This assignment represents an IEEE MA-M allocation, granting a dedicated boundary of 1,048,576 unique host MAC addresses.

START: 74:25:84:D0:00:00 1,048,576 Total Addresses END: 74:25:84:DF:FF:FF
Lower Bound (Base Host 0) Upper Bound (Top Boundary)
IEEE Registry Tier MA-M Universally Administered (UAA)
Total Host Capacity 1,048,576 Exact binary space: 220 addresses
Derived IPv6 Link-Local SLAAC Base RFC 4291 EUI-64
fe80::7625:84ff:fed0:0000

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

28-Bit Architecture
Allocation Spread 28-BIT PREFIX (58%) + 20-BIT HOST (42%)
28-Bit Prefix
20-Bit Host
Bit 0 [74:25:84:D]
Bit 28
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 74 0111 01 0 0
Octet 1 25 0010 0101
Octet 2 84 1000 0100
Octet 3 (high nibble) D_ 1101 [Host]
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
Display Filter: eth.addr[0:3] == 74:25:84 && (eth.addr[3] & 0xf0) == 0xd0
No custom Wireshark manufacturer alias overrides registered for this prefix.

REST API v2

200 OK
CLI curl -s https://api.maclookup.app/v2/macs/742584d -H 'Accept: application/json'
{
  "success": true,
  "found": true,
  "macPrefix": "742584D",
  "company": "Shenzhen smart-core technology co.,ltd.",
  "address": "10th Floor, Building A, Chuangyi Kexing Science Park, No. 198, Keji Zhongyi Road, Yuehai Street 10th Floor, Building A, Chuangyi Kexing Science Park, No. 198, Keji Zhongyi Road, Yuehai Street Nanshan District, Shenzhen Guangdong 518057, CN",
  "country": "CN",
  "blockStart": "742584D00000",
  "blockEnd": "742584DFFFFF",
  "blockSize": 1048575,
  "blockType": "MA-M",
  "updated": "2026-05-05",
  "isRand": false,
  "isPrivate": false
}