00:21:3A Winchester Systems Inc.
Every MAC address from 00:21:3A:00:00:00 to 00:21:3A:FF:FF:FF belongs to a block the IEEE assigned to Winchester Systems Inc.. Network cards, phones and other devices it makes carry addresses from here.
Assignment
Who 00:21:3A belongs to
Written 00:21:3A, 00-21-3A or 00213A, depending on the system. Look up a full address.
Prefix
00:21:3A
Organization
Winchester Systems Inc.
Registry
MA-L (a 24-bit OUI)
Addresses
16,777,216
First address
00:21:3A:00:00:00
Last address
00:21:3A:FF:FF:FF
Address type
Globally unique, unicast
Registered address
101 Billerica Avenue Billerica, MA US 01862