How to Identify Date Codes

Date Codes are used to identify the location and specific week in which a switch was manufactured. The Date Codes are integrated in the first 7 characters of an 11 character System Serial Number: CHK0624A275. The first three letters represent the manufacturing location (CHK). The four subsequent numbers are the year (06) and the week (24) a switch was manufactured (0624).
Where to Find Serial Number on Switch

Serial Numbers can be found in these locations.

1. The packout box
2. The back of the switch
3. If switch is already installed in network, Telnet to Unit, or Connect directly to switch console, and type the following command:

switch#show version | include serial
Motherboard serial number: CAT0625027D
Power supply serial number: LIT062103KJ
System serial number: CHK0625V224
Or use the following command, and the serial number is near bottom of output:

switch#show version
Cisco Internetwork Operating System Software
IOS ™ C3550 Software (C3550-I5Q3L2-M), Version 12.1(9)EA1c, RELEASE SOFTWARE (fc1)
Copyright © 1986-2002 by cisco Systems, Inc.
Compiled Tue 28-May-02 10:31 by antonino
Image text-base: 0x00003000, data-base: 0x00685778

ROM: Bootstrap program is C3550 boot loader

top_5 uptime is 1 minute
System returned to ROM by power-on
System image file is "flash:c3550-i5q3l2-mz.121-9.EA1c/c3550-i5q3l2-mz.121-9.EA1c.bin"

cisco WS-C3550-24 (PowerPC) processor (revision D0) with 65526K/8192K bytes of memory.
Processor board ID CHK0625V224
Last reset from warm-reset
Bridging software.
Running Layer2/3 Switching Image

Ethernet-controller 1 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 2 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 3 has 1 Gigabit Ethernet/IEEE 802.3 interface

Ethernet-controller 4 has 1 Gigabit Ethernet/IEEE 802.3 interface

24 FastEthernet/IEEE 802.3 interface(s)
2 Gigabit Ethernet/IEEE 802.3 interface(s)

The password-recovery mechanism is enabled.
384K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:0A:41:07:74:00
Motherboard assembly number: 73-5700-08
Power supply part number: 34-0966-02
Motherboard serial number: CAT0625027D
Power supply serial number: LIT062103KJ
Model revision number: D0
Motherboard revision number: C0
Model number: WS-C3550-24-EMI
System serial number: CHK0625V224
Configuration register is 0x10F 

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