Cisco ISR4431/K9 End of Life & End of Support
Cisco ISR 4431 Integrated Services Router
Supported through Nov 30, 2028The ISR4431 was a mid-to-high tier branch router for higher-throughput WAN aggregation, SD-WAN and security services beyond what the 4331/4351 could handle. Cisco's migration path is the Catalyst 8300 edge platform, with the fiber-uplink configuration matching its throughput class.
Cisco ISR4431/K9 lifecycle milestone dates
- End-of-Sale Date
- Nov 7, 2023
- Last Date of Support (LDoS)
- Nov 30, 2028
Dates per Cisco’s official End-of-Sale/End-of-Life bulletin. Verify against your support contract before acting.
Running past End-of-Sale or Last Date of Support means no new Cisco TAC, hardware replacement, or security fixes. Uniqcli, an authorized Cisco partner, scopes a like-for-like or better replacement, confirms TAA compliance, accepts the Government Purchase Card (GPC), and plans a low-risk cutover.
Prefer to keep it running? Renew SmartNet / support instead →
Replacement backordered or budget not ready? See extended support options →
Not sure this is your exact unit? Look it up by serial number →
Related end-of-life Cisco products
Frequently asked questions
When is the Cisco ISR4431/K9 end of life?
Cisco announced End-of-Sale for the ISR4431/K9 effective Nov 7, 2023. The Last Date of Support (LDoS) is Nov 30, 2028, after which Cisco no longer provides support. Check the milestone dates on this page and plan your refresh accordingly.
What replaces the Cisco ISR4431/K9?
Cisco's recommended migration is the Cisco Catalyst C8300-2N2S-4T2X Edge Platform. Uniqcli, an authorized Cisco partner, can quote the replacement TAA-compliant and GPC-payable, and help plan the cutover.
Can I still get support for the ISR4431/K9?
Yes, until the Last Date of Support (Nov 30, 2028) with an active SmartNet/Solution Support contract. After LDoS, independent third-party maintenance can extend hardware coverage. Uniqcli can review your install base, confirm coverage, and quote extended support or a refresh side by side.