MAC address 8C:1F:64:51:9 details

Assigned Prefix
8C:1F:64:51:9

36-bit Prefix (MA-S)

Block Base Allocation
8C:1F:64:51:90:00

Hardware Interface 0x000 (Min)

Block Top Boundary
8C:1F:64:51:9F:FF

Hardware Interface 0xFFF (Max)

Network Addressing & Host Scope

MA-S

This assignment represents an IEEE MA-S allocation, granting a dedicated boundary of 4,096 unique host MAC addresses.

START: 8C:1F:64:51:90:00 4,096 Total Addresses END: 8C:1F:64:51:9F:FF
Lower Bound (Base Host 0) Upper Bound (Top Boundary)
IEEE Registry Tier MA-S Universally Administered (UAA)
Total Host Capacity 4,096 Exact binary space: 212 addresses
Derived IPv6 Link-Local SLAAC Base RFC 4291 EUI-64
fe80::8e1f:64ff:fe51:9000

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

36-Bit Architecture
Allocation Spread 36-BIT PREFIX (75%) + 12-BIT HOST (25%)
36-Bit Prefix
12-Bit Host
Bit 0 [8C:1F:64:51:9]
Bit 36
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 8C 1000 11 0 0
Octet 1 1F 0001 1111
Octet 2 64 0110 0100
Octet 3 51 0101 0001
Octet 4 (high nibble) 9_ 1001 [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[0:4] == 8c:1f:64:51 && (eth.addr[4] & 0xf0) == 0x90
No custom Wireshark manufacturer alias overrides registered for this prefix.

REST API v2

200 OK
CLI curl -s https://api.maclookup.app/v2/macs/8c1f64519 -H 'Accept: application/json'
{
  "success": true,
  "found": true,
  "macPrefix": "8C1F64519",
  "company": "SHENZHEN GW TECHNOLOGY CO.,LTD",
  "address": "1501, Building T2, Haigu Technology Building, 140 meters southeast of the intersection of Jianxing Road and Baoshi South Road, Shiyan Street, Bao'an District, Shenzhen City, Guangdong Province, Shenzhen GUANGDONG 518000, CN",
  "country": "CN",
  "blockStart": "8C1F64519000",
  "blockEnd": "8C1F64519FFF",
  "blockSize": 4095,
  "blockType": "MA-S",
  "updated": "2024-09-03",
  "isRand": false,
  "isPrivate": false
}