Last verified: 2026-10-20 The Cisco 4331 Integrated Services Router (ISR4331/K9) is past its End of Sale date and is no longer receiving standard software maintenance updates. As of October 2026, the hardware remains under routine vulnerability support until its final Last Date of Support (LDoS) on November 30, 2028, at which point all official manufacturer … Read more
The Cisco 4000 Series ISR is end of sale. Cisco’s official series page (checked October 2026) gives these dates: ISR 4221, 4321, 4331, 4351, 4431, 4451-X: Last Date of Support is 30 November 2028. ISR 4461: end of sale was 20 January 2025. Last Date of Support is 31 January 2030. Recommended replacement: Cisco Catalyst … Read more
Cisco 1000 Series Integrated Services Routers EOL Last verified: October 8, 2026 Cisco has not announced EOL for the Cisco 1000 Series Integrated Services Routers as a whole. It has announced it part number by part number, in seven hardware bulletins published between November 2022 and July 2026, so your dates depend on which bulletin … Read more
The Cisco 900 Series Integrated Services Routers are now End of Sale. Cisco’s last day to order the affected hardware and licenses through its normal point-of-sale channels was July 28, 2026. That does not mean Cisco 900 Series routers immediately stop working or that all support has ended. Cisco’s published lifecycle schedule extends much further: … Read more
Cisco 800 Series Routers EOL: End-of-Life and Support Information The Cisco 800 Series Integrated Services Routers (ISRs) have served as the standard fixed-configuration edge device for small offices, teleworkers, and enterprise branch locations for over a decade. Cisco has systematically phased out the majority of this family, transitioning customers to newer SD-WAN-capable platforms. Because the … Read more