MAC Address Lookup

Cisco Systems, Inc 00:21:A1

00:21:A1 is a 24-bit MA-L MAC address block registered to Cisco Systems, Inc in US.

Vendor

Cisco Systems, Inc

MA-L · 24-bit
00:21:A1

Unicast · Universally administered (U/L bit clear)

Matched prefix
00:21:A1
Match
MA-L assignment
Address range
00:21:A1:00:00:00 – 00:21:A1:FF:FF:FF
Addresses in block
16,777,216
Country
US
Organization address
80 West Tasman Drive San Jose CA US 94568
First registered
Jun 18, 2008

Formats

  • Plain hex 0021A1
  • Colon-separated 00:21:A1
  • Hyphen-separated 00-21-A1
  • Cisco dot notation 0021.A1

Prefix lineage

This prefix has changed hands. Dates are when each change was first observed in public registration data (runZero mac-tracker).

  1. Cisco Systems Jun 18, 2008
  2. CISCO SYSTEMS, INC. Jan 30, 2013
  3. Cisco Systems Jan 31, 2013
  4. CISCO SYSTEMS, INC. Feb 14, 2013