MAC address 8C:1F:64:87:8 details

Assigned Prefix
8C:1F:64:87:8

36-bit Prefix (MA-S)

Block Base Allocation
8C:1F:64:87:80:00

Hardware Interface 0x000 (Min)

Block Top Boundary
8C:1F:64:87:8F: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:64:87:80:00 4,096 Total Addresses END: 8C:1F:64:87:8F: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:fe87:8000

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:64:87:8]
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 87 1000 0111
Octet 4 (high nibble) 8_ 1000 [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:64:87 && (eth.addr[4] & 0xf0) == 0x80
No custom Wireshark manufacturer alias overrides registered for this prefix.

REST API v2

200 OK
CLI curl -s https://api.maclookup.app/v2/macs/8c1f64878 -H 'Accept: application/json'
{
  "success": true,
  "found": true,
  "macPrefix": "8C1F64878",
  "company": "Green Access Ltd",
  "address": "Unit 1 Kensworthgate  200-204 High Street South, Dunstable Bedfordshire  LU6 3HS, GB",
  "country": "GB",
  "blockStart": "8C1F64878000",
  "blockEnd": "8C1F64878FFF",
  "blockSize": 4095,
  "blockType": "MA-S",
  "updated": "2021-05-18",
  "isRand": false,
  "isPrivate": false
}