MAC address CA:12:5C (Microsoft Corporation)

MAC address prefix CA:12:5C is registered to Microsoft Corporation, located at One Microsoft Way, Redmond 98052-6399, US. This registration is classified as CID (Company Identifier), not for globally unique applications. The prefix was initially registered on 13 September 2017, with the most recent update made on 28 October 2025.

Vendor & Registry Dossier

Public Allocation
Assigned Prefix
CA:12:5C
Registrant / Organization
Microsoft Corporation
Registry Chronology
Initial registration: 13 September 2017
Last updated: 28 October 2025
Assignment Classification
CID

(Company Identifier), not for globally unique applications

Registered Location

MAC Address Vendor Country United States (US) map
Country: United States (US)
Headquarters Registered Facility 🇺🇸 US
One Microsoft Way
Redmond 98052-6399
US.

REST API v2

200 OK
CLI curl -s https://api.maclookup.app/v2/macs/ca125c -H 'Accept: application/json'
{
  "success": true,
  "found": true,
  "macPrefix": "CA125C",
  "company": "Microsoft Corporation",
  "address": "One Microsoft Way, Redmond  98052-6399, US",
  "country": "US",
  "blockStart": "CA125C000000",
  "blockEnd": "CA125CFFFFFF",
  "blockSize": 16777215,
  "blockType": "CID",
  "updated": "2025-10-28",
  "isRand": true,
  "isPrivate": false
}