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Cisco ISR4451-X/K9 End of Life & End of Support

Cisco ISR 4451-X Integrated Services Router

Supported through Nov 30, 2028

The ISR4451-X was Cisco's high-end ISR 4000 branch and regional-aggregation router, commonly deployed at larger sites needing higher encrypted throughput. Cisco's own migration guidance flags it as a candidate for the Catalyst 8500 series rather than the smaller 8300, given its aggregation-router role.

Cisco ISR4451-X/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.

Upgrade or extend support on your schedule

Tell us what you run and a Cisco Solutions Specialist will map the replacement or support path with TAA-compliant, GPC-payable options. No obligation.

Authorized Cisco partner · TAA-compliant options · GPC accepted.

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

ISR4221/K9Cisco ISR 4221 Integrated Services RouterEoLISR4321/K9Cisco ISR 4321 Integrated Services RouterEoLISR4331/K9Cisco ISR 4331 Integrated Services RouterEoLISR4351/K9Cisco ISR 4351 Integrated Services RouterEoL

Frequently asked questions

When is the Cisco ISR4451-X/K9 end of life?

Cisco announced End-of-Sale for the ISR4451-X/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 ISR4451-X/K9?

Cisco's recommended migration is the Cisco Catalyst C8500-12X4QC 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 ISR4451-X/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.