Approaching EOSL · 30 months remaining
Cisco Isr 4351 Router (ISR4351/K9)
End of Life, End of Sale, and End of Service Life dates for the ISR4351/K9. Replacement options, third-party support, and hardware migration paths.
EOL, EOS, and EOSL data for ISR4351/K9
All dates are pulled from the manufacturer's official End-of-Life bulletin. End of Service Life is the date that matters for your support contract.
- Release Date
- 16 Sep 2014
- End of Life (EOL)
- Not announced
- End of Sale (EOS)
- 20 Jan 2025
- End of Service Life (EOSL)
- 30 Nov 2028
- Part Number
- ISR4351/K9
- Part Name
- Cisco Isr 4351 Router
- Product Series
- ISR 4000 Series
- Category
- Networking
- Brand
- Cisco
- Official OEM Notice
- View Cisco source →
Networking hardware commonly stays in service for 8–12 years — past End of Sale and into End of Service Life. Without OEM hardware support, security patches and firmware updates stop. Third-party hardware maintenance and extended support can keep ISR4351/K9 and similar hardware operational for another 3–5 years past EOL. OEM‑sourced data: Need confirmation or help planning next steps? Contact us
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Other ISR 4000 Series part numbers
19 other part numbers in the ISR 4000 Series family.
| Product Name | Part Number | EOSL |
|---|---|---|
| Cisco ONE ISR 4321 (2GE,2NIM,4G FLASH,4G DRAM,IPB) (C1-CISCO4321/K9) | C1-CISCO4321/K9 | 31 Oct 2027 |
| Cisco ONE ISR 4331 (3GE,2NIM,1SM,4G FLASH,4G DRAM,IPB) (C1-CISCO4331/K9) | C1-CISCO4331/K9 | 31 Oct 2027 |
| Cisco ONE ISR 4351 (3GE,3NIM,2SM,4G FLASH,4G DRAM,IPB) (C1-CISCO4351/K9) | C1-CISCO4351/K9 | 31 Oct 2027 |
| Cisco ONE ISR 4431 (4GE,3NIM,8G FLASH,4G DRAM,IPB) (C1-CISCO4431/K9) | C1-CISCO4431/K9 | 31 Oct 2027 |
| Cisco ONE ISR 4451 (4GE,3NIM,2SM,8G FLASH,4G DRAM, IPB) (C1-CISCO4451/K9) | C1-CISCO4451/K9 | 31 Oct 2027 |
| Cisco Isr 4321 Service Router (ISR4321/K9) | ISR4321/K9 | 30 Nov 2028 |
| Cisco 4331 Integrated Services Sec Router (ISR4331-AX/K9) | ISR4331-AX/K9 | 30 Nov 2028 |
| Cisco 4331 Sec Integrated Services Router (ISR4331-SEC/K9) | ISR4331-SEC/K9 | 30 Nov 2028 |
| Cisco 4331 Integrated Services Uc Router Bundle (ISR4331-V/K9) | ISR4331-V/K9 | 30 Nov 2028 |
| Cisco 4331 Integrated Services Router (ISR4331/K9) | ISR4331/K9 | 30 Nov 2028 |
| Cisco Isr 4351 Uc Router Bundle (ISR4351-V/K9) | ISR4351-V/K9 | 30 Nov 2028 |
| Cisco Isr 4431 Ax Security Service Router (ISR4431-AX/K9) | ISR4431-AX/K9 | 30 Nov 2028 |
| Cisco Isr 4431 Security Service Router (ISR4431-SEC/K9) | ISR4431-SEC/K9 | 30 Nov 2028 |
| Cisco Isr 4431 Service Router Bundle (ISR4431-V/K9) | ISR4431-V/K9 | 30 Nov 2028 |
| Cisco Isr 4431 Integrated Services Router (ISR4431/K9) | ISR4431/K9 | 30 Nov 2028 |
| Cisco 4451-X Integrated Services Router Ax Bundle (ISR4451-X-AX/K9) | ISR4451-X-AX/K9 | 30 Nov 2028 |
| Cisco Isr 4451 Sec Router Bundle (ISR4451-X-SEC/K9) | ISR4451-X-SEC/K9 | 30 Nov 2028 |
| Cisco 4451-X Integrated Services Router (ISR4451-X/K9) | ISR4451-X/K9 | 30 Nov 2028 |
| Cisco Isr4461 4-Port Gbe Router (ISR4461/K9) | ISR4461/K9 | 31 Jan 2030 |