64:31:39:40:00:00 to 64:31:39:4F:FF:FF
Active Brains
Inspect this prefixRegistered address
Yokohama Mitsui Bldg.12F, 1-1-2 Takashima, Nishi-ku
Yokohama Kanagawa 220-0011
Block details
- Registry
- MA-M, MAC Address Block Medium (OUI-28)
- Prefix
- 64:31:39:4 /28
- Addresses in block
- 1,048,576
- Decimal range
- 110,162,576,670,720 to 110,162,577,719,295
- Address type
- Unicast, universally administered
What this block covers
A 28 bit block. Sixteen of these fit inside one 24 bit prefix, so the first three octets are shared with other registrants.
Any MAC address between 64:31:39:40:00:00 and 64:31:39:4F:FF:FF belongs to this assignment. The registrant chooses the remaining 20 bits, so the same prefix can appear on very different products from the same company.