Cisco Serial Number Decoder: How to Identify Cisco Manufacturing Date and Factory Location
For enterprise IT teams, Cisco resellers, and network engineers, the Cisco serial number contains far more information than just a device identifier.
A single serial number can reveal:
- Manufacturing date
- Production week
- Factory location
- Hardware lifecycle stage
- Warranty and support eligibility
Because of this, understanding how to decode Cisco serial numbers is an essential part of network asset management and procurement evaluation.
If you are looking for a complete guide on how Cisco serial numbers work — including authenticity verification, warranty checks, and hardware identification — start with our full Cisco serial number lookup guide.
This article focuses on one of the most requested topics from enterprise buyers and network engineers: how to decode Cisco serial numbers to determine the manufacturing date, factory location, and country of origin.
Why Cisco Manufacturing Date Matters for Enterprise Networks
For enterprise environments, knowing the manufacturing date of network hardware is more than curiosity. It directly impacts operational reliability and upgrade planning.
1. Hardware Lifecycle Planning
Enterprise network equipment typically has a 5–10 year operational lifecycle. Knowing when a device was manufactured helps IT teams determine whether it is approaching End-of-Life (EOL) or End-of-Support (EOS).
2. Failure Risk Assessment
Older devices have a higher probability of component failure, particularly:
- Power supplies
- Cooling fans
- Capacitors on switching boards
A switch manufactured 8 years ago statistically carries higher risk than one produced 2 years ago.
3. Refurbished Equipment Evaluation
When purchasing refurbished Cisco equipment, the manufacturing date helps evaluate:
- Remaining hardware lifespan
- Asset depreciation
- Maintenance planning
4. Compliance and Asset Tracking
Large enterprises often track device origin and manufacturing location for procurement compliance and supply-chain auditing.
Cisco Serial Number Format Explained
Most modern Cisco hardware uses an 11-character alphanumeric serial number format.
Example serial number: FOC1835ABCD
This serial number follows a specific structure:
| Segment | Example | Meaning |
|---|---|---|
| LLL | FOC | Manufacturing location code |
| YY | 18 | Cisco internal year code |
| WW | 35 | Week of manufacturing (01-52) |
| SSSS | ABCD | Unique device identifier |
The two most important sections for identifying device origin and age are:
- LLL → Manufacturing location
- YY + WW → Production date
How to Find Cisco Manufacturing Date from Serial Number
Cisco does not directly encode the calendar year in the serial number. Instead, Cisco uses an internal year code system, which must be mapped to the actual manufacturing year.
Example serial number: FOC1940ABCD
Breakdown:
| Segment | Meaning |
|---|---|
| FOC | Foxconn manufacturing site |
| 19 | Cisco year code |
| 40 | Week 40 of production |
Using the year code mapping table below, year code 19 maps to 2015. Therefore, this device was manufactured approximately in Week 40 of 2015 (around October 2015).
Cisco Manufacturing Year Code Reference
Quick rule: subtract 4 from the two-digit year code to read it as a 20xx year — for example, code 18 → 18 − 4 = 14 → 2014, and code 28 → 24 → 2024. (Equivalently, add 1996: 1996 + 18 = 2014.) The reference table below lists the year codes you will most often see on enterprise Cisco equipment.
Below is a simplified reference table commonly encountered in enterprise Cisco equipment.
| Year Code | Manufacturing Year |
|---|---|
| 16 | 2012 |
| 17 | 2013 |
| 18 | 2014 |
| 19 | 2015 |
| 20 | 2016 |
| 21 | 2017 |
| 22 | 2018 |
| 23 | 2019 |
| 24 | 2020 |
| 25 | 2021 |
| 26 | 2022 |
| 27 | 2023 |
| 28 | 2024 |
| 29 | 2025 |
Example: a serial number of FGL2844XXXX breaks down as:
| Segment | Meaning |
|---|---|
| FGL | Manufacturing location |
| 28 | Year code |
| 44 | Production week |
Result: manufactured in Week 44 of 2024.
How to Identify Cisco Manufacturing Location from Serial Number
The first three characters of a Cisco serial number represent the manufacturing location code. These codes identify the contract manufacturer or production facility responsible for assembling the device.
Understanding the manufacturing location can be useful for:
- Supply chain verification
- Asset tracking
- Refurbished hardware inspection
- Enterprise procurement audits
Cisco Serial Number Prefix Database (Common Manufacturing Location Codes)
Cisco serial numbers begin with a three-character prefix that identifies the manufacturing location or contract manufacturer responsible for assembling the device.
These prefixes are commonly used across Cisco products such as:
- Catalyst switches
- Nexus switches
- ISR / ASR routers
- Firepower security appliances
- UCS servers
Understanding the prefix can help enterprises identify the production facility, supply chain origin, and manufacturing batch of their network hardware. Below is a reference database of common Cisco serial number prefixes observed in enterprise equipment.
| Prefix | Manufacturer | Country / Region | Notes |
|---|---|---|---|
| FOC | Foxconn | China | Common for Catalyst switches |
| FNS | Foxconn | China | Network equipment production |
| FCH | Foxconn | China | Frequently used in routers |
| FGL | Foxconn | China | Seen on many modern Cisco devices |
| FDO | Foxconn | China | Often used on server hardware |
| FPR | Foxconn | China | Firepower appliance manufacturing |
| FJC | Foxconn | China | Network device assembly |
| FCL | Foxconn | China | Networking hardware |
| FRT | Foxconn | China | Enterprise switching platforms |
| FTS | Foxconn | China | Hardware assembly facility |
| JAE | Jabil | Mexico / USA | Contract manufacturing |
| JAB | Jabil | Mexico | Networking equipment |
| JAF | Jabil | Mexico | Cisco routers and switches |
| JAD | Jabil | Mexico | Contract electronics manufacturing |
| JAZ | Jabil | Mexico | Enterprise hardware |
| CAT | Celestica | Canada / Mexico | Enterprise equipment |
| CTH | Celestica | Thailand | Cisco networking hardware |
| CTC | Celestica | Canada | Network hardware manufacturing |
| CTP | Celestica | Thailand | Switching platforms |
| CTI | Celestica | Thailand | Enterprise networking devices |
| PEN | Solectron / Flex | Malaysia | Legacy Cisco manufacturing |
| PEA | Flextronics | China | Contract electronics |
| PEI | Flextronics | China | Network hardware |
| PEM | Flextronics | Malaysia | Enterprise networking equipment |
| PET | Flextronics | Thailand | Cisco assembly site |
| SAL | Sanmina | Malaysia | Networking equipment |
| SAI | Sanmina | Malaysia | Enterprise hardware |
| SAN | Sanmina | Mexico | Contract manufacturing |
| SFT | Sanmina | Thailand | Cisco production facility |
| SFC | Sanmina | China | Networking device assembly |
| LFO | Cisco / Foxconn | China | Seen on Catalyst devices |
| LFD | Cisco / Foxconn | China | Enterprise switching |
| LFS | Cisco / Foxconn | China | Networking hardware |
| LFT | Cisco / Foxconn | China | Assembly plant |
| LFC | Cisco / Foxconn | China | Hardware manufacturing |
| WMX | Wistron | Taiwan | Contract electronics |
| WMS | Wistron | Taiwan | Networking hardware |
| WMT | Wistron | Taiwan | Enterprise equipment |
| WMC | Wistron | Taiwan | Cisco devices |
| WMP | Wistron | Taiwan | Contract manufacturing |
| KTN | Kaohsiung / Taiwan manufacturing | Taiwan | Networking equipment |
| KTS | Taiwan manufacturing | Taiwan | Assembly site |
| KTT | Taiwan manufacturing | Taiwan | Hardware assembly |
| KTC | Taiwan manufacturing | Taiwan | Enterprise network devices |
| KTP | Taiwan manufacturing | Taiwan | Cisco equipment |
How to Use Cisco Serial Number Prefixes
When reviewing Cisco hardware inventory, the prefix allows IT teams to quickly determine:
Manufacturing origin
The contract manufacturer and its typical facility region. For example, a serial number beginning with JAE points to a Jabil facility (Mexico / USA), while FOC points to Foxconn (China).
Production batch tracking
Manufacturing prefixes help identify devices produced within the same supply chain batch or factory line.
Procurement validation
Enterprises buying refurbished Cisco equipment sometimes verify:
- Production facility
- Manufacturing timeline
- Hardware authenticity indicators
Important Notes About Cisco Manufacturing Prefixes
Cisco does not publicly publish a complete official list of all serial number prefixes. Because Cisco hardware is produced through multiple contract manufacturers worldwide, new prefixes may appear over time depending on supply chain changes. However, the prefixes listed above cover the most commonly observed production codes across enterprise Cisco equipment.
Where Are Cisco Products Manufactured? (Country of Origin)
Cisco does not manufacture in a single country. It uses global contract manufacturers across several regions — Foxconn, Jabil, Celestica, Flex, Sanmina, Wistron, and others, as the prefix table above shows — so a product’s country of origin varies by model and even by production run. You cannot reliably infer it from the model number, and two identical units can ship from different facilities.
Cisco does maintain an official Country of Origin (COO) list, but it is Cisco-confidential — available only to authorized U.S. Federal sales teams, channel partners, and distributors, largely for U.S. Federal and TAA compliance. There is no public, per-model country-of-origin lookup.
So to confirm where a specific unit was made, use one of these:
- The product packaging and unit label. Country of origin (“Made in …”) is printed on the box and the chassis label. This is the authoritative source for a physical unit.
- The serial number prefix. As shown above, the first three characters identify the contract manufacturer and its typical region — the closest indicator you can read straight from the serial number.
- Your vendor or Cisco. For procurement or TAA compliance, request the country of origin from your supplier or an authorized Cisco partner, who can reference the official COO list.
The practical takeaway for procurement and compliance teams: do not rely on a generic “Cisco is made in country X” claim. The prefix tells you the likely manufacturing region, but confirm the official country of origin per unit from the packaging or your vendor before it matters for a contract or customs.
Example: Decoding a Cisco Serial Number Step-by-Step
Example device serial number: FGL2844L830
Breakdown:
| Segment | Meaning |
|---|---|
| FGL | Foxconn manufacturing facility |
| 28 | Cisco year code |
| 44 | Production week |
| L830 | Unique identifier |
Conclusion: this device was built by Foxconn in Week 44 of 2024. That information helps determine:
- Hardware lifecycle stage
- Remaining service lifespan
- Upgrade planning timeline
Why Manual Cisco Serial Number Decoding Is Inefficient
While manual decoding is possible using charts, it becomes inefficient in real-world environments. Network teams managing large infrastructures may need to check hundreds of devices. Manual decoding introduces several problems:
Time-consuming
Checking serial numbers one by one slows down inventory audits.
Error-prone
Using incorrect year mappings or reading serial numbers incorrectly can produce inaccurate results.
Difficult at scale
Large enterprises often manage thousands of network devices across multiple sites.
Instantly Decode Cisco Serial Numbers
To simplify this process, use a free Cisco serial number checker that instantly analyzes a Cisco serial number and returns:
- Manufacturing date
- Production week
- Factory location
- Estimated hardware age
Free Cisco Serial Number Checker
Try the Cisco serial number checker and warranty lookup tool to decode any Cisco serial number instantly — no manual chart lookups required.
