Cisco Router ISR 4000 License

 

Cisco ISR 4000 Router Licenses — Buy Genuine Security, HSEC, UC, AppX, Boost & Performance Keys

Genuine Cisco ISR 4000 licenses for 4221, 4321, 4331, 4351, 4431, and 4451 routers. Instant e-delivery worldwide · 100% working guarantee · Free installation support. Security (SEC), High Security (HSEC), Unified Communications (UC), AppX, Boost, and Performance — all license types in stock starting from $20.

E-delivery within 24h License file sent by email
100% working guarantee Full refund if activation fails
Free install support Step-by-step activation help
Secure checkout PayPal & Shopify Payments
Security (SEC)
IPsec VPN, zone-based firewall, SSL VPN, intrusion prevention
High Security (HSEC)
Removes crypto limits, higher VPN throughput
Unified Comm. (UC)
CME, voicemail, SIP/H.323, SRST telephony
AppX (APP)
All-in-one: SEC + UC + routing + WAN optimization
Boost
Increases aggregate router throughput, no hardware change
Performance
Bandwidth tier upgrade (35M→1G depending on model)

Cisco ISR 4000 Series Integrated Services Routers are the next-generation branch platform succeeding the ISR G2 family. Models include the ISR 4221, 4321, 4331, 4351, 4431, and 4451 — spanning entry-level to high-performance branch routers with modular service capabilities, embedded security, and application-aware routing.

Unlike the ISR G2 series, ISR 4000 routers use a single universal IOS XE image with software-activated feature licenses. The base IP Base license is included with the hardware. Additional technology packages unlock advanced networking, security, voice, and performance capabilities without replacing hardware or reloading software.

This collection covers all ISR 4000 license types — Security (SEC), High Security (HSEC), Unified Communications (UC), Application Experience (AppX), Boost (throughput upgrade), and Performance (bandwidth tier upgrade). All licenses are delivered electronically via email within 24 hours.

Not sure which license you need? Select your router and requirements:
My router model
I need to enable
Browse all 29 Cisco ISR 4000 license products by model
L-SL-4220-SEC-K9 — ISR 4221 Security L-SL-4220-APP-K9 — ISR 4221 AppX L-FL-4220-BOOST-K9 — ISR 4221 Boost L-FL-4220-PERF-K9 — ISR 4221 Performance L-SL-4320-SEC-K9 — ISR 4321 Security L-FL-4320-HSEC-K9 — ISR 4321 HSEC L-SL-4320-UC-K9 — ISR 4321 UC L-SL-4320-APP-K9 — ISR 4321 AppX L-FL-4320-BOOST-K9 — ISR 4321 Boost L-FL-4320-PERF-K9 — ISR 4321 Performance L-SL-4330-SEC-K9 — ISR 4331 Security L-FL-4330-HSEC-K9 — ISR 4331 HSEC L-SL-4330-UC-K9 — ISR 4331 UC L-SL-4330-APP-K9 — ISR 4331 AppX L-FL-4330-BOOST-K9 — ISR 4331 Boost L-FL-4330-PERF-K9 — ISR 4331 Performance L-SL-4350-SEC-K9 — ISR 4351 Security L-FL-4350-HSEC-K9 — ISR 4351 HSEC L-SL-4350-UC-K9 — ISR 4351 UC L-SL-4350-APP-K9 — ISR 4351 AppX L-FL-4350-BOOST-K9 — ISR 4351 Boost L-FL-4350-PERF-K9 — ISR 4351 Performance L-SL-44-SEC-K9 — ISR 4431/4451 Security L-FL-44-HSEC-K9 — ISR 4431/4451 HSEC L-SL-44-UC-K9 — ISR 4431/4451 UC L-SL-44-APP-K9 — ISR 4431/4451 AppX L-FL-44-BOOST-K9 — ISR 4431/4451 Boost L-FL-44-PERF-K9 — ISR 4431/4451 Performance L-FL-4430-BOOST-K9 — ISR 4431 Boost

Supported Router Models

  • Cisco ISR 4221
  • Cisco ISR 4321
  • Cisco ISR 4331
  • Cisco ISR 4351
  • Cisco ISR 4431
  • Cisco ISR 4451

License Comparison — What Each Package Unlocks

Package Part numbers Key features unlocked
SEC Security L-SL-4220-SEC-K9 L-SL-4320-SEC-K9 L-SL-4330-SEC-K9 L-SL-4350-SEC-K9 L-SL-44-SEC-K9 IPsec VPN (site-to-site & remote access) · Zone-based firewall (ZFW) · SSL VPN · GET VPN · IOS IPS intrusion prevention
HSEC High Security L-FL-4320-HSEC-K9 L-FL-4330-HSEC-K9 L-FL-4350-HSEC-K9 L-FL-44-HSEC-K9 Removes crypto throughput restrictions · Enables higher IPsec VPN throughput · Supports maximum tunnel count for the platform · Required for regulatory compliance in certain regions
UC Unified Comm. L-SL-4320-UC-K9 L-SL-4330-UC-K9 L-SL-4350-UC-K9 L-SL-44-UC-K9 Cisco CME (Unified Communications Manager Express) · Unity Express voicemail · SIP & H.323 gateway · SRST survivable telephony · Conferencing & transcoding
APP AppX L-SL-4220-APP-K9 L-SL-4320-APP-K9 L-SL-4330-APP-K9 L-SL-4350-APP-K9 L-SL-44-APP-K9 All SEC + UC + DATA features · Application Experience (AX) · Full WAAS WAN optimization · Application visibility & control · Best value — single license for all advanced features
BOOST Throughput L-FL-4220-BOOST-K9 L-FL-4320-BOOST-K9 L-FL-4330-BOOST-K9 L-FL-4350-BOOST-K9 L-FL-44-BOOST-K9 L-FL-4430-BOOST-K9 Increases aggregate router throughput beyond base level · Adds headroom for concurrent services · No hardware upgrade required · License activation via Cisco Smart Licensing
PERF Performance L-FL-4220-PERF-K9 L-FL-4320-PERF-K9 L-FL-4330-PERF-K9 L-FL-4350-PERF-K9 L-FL-44-PERF-K9 Upgrades performance license tier: 4221 35M→75M · 4321 50M→100M · 4331 100M→300M · 4351 200M→400M · 4431/4451 500M→1G · No hardware module required

Frequently Asked Questions

What license types are available for Cisco ISR 4000 routers?
Six license types are available for Cisco ISR 4000 routers: Security (SEC) for VPN/firewall/IPS, High Security (HSEC) to remove crypto throughput limits, Unified Communications (UC) for voice/CME/SRST, AppX (APP) — an all-in-one bundle of SEC+UC+DATA+WAAS, Boost for aggregate throughput upgrade, and Performance for bandwidth tier upgrade (e.g., 35M→75M on 4221, 200M→400M on 4351).
Which Cisco ISR 4000 router models are supported?
All six ISR 4000 models are supported: ISR 4221, 4321, 4331, 4351, 4431, and 4451. Each license SKU is model-specific — for example, L-SL-4220-SEC-K9 for ISR 4221 and L-SL-44-SEC-K9 for ISR 4431/4451.
How are Cisco ISR 4000 licenses delivered after purchase?
All licenses are genuine Cisco license files delivered electronically via email within 24 hours. After purchase, run show license udi on your router, send us the output, and you'll receive the .LIC file for instant CLI activation. We provide free installation support if needed.
What is the difference between ISR 4000 and ISR G2 licensing?
Unlike the ISR G2 series which required separate IOS images per feature set, ISR 4000 routers use a single universal IOS XE image with software-activated feature licenses. You can add Security, UC, or AppX features without replacing hardware or reloading software — simply install the license file and activate the new capabilities.
Are these genuine Cisco licenses? What is the refund policy?
Yes, all licenses are genuine Cisco-issued licenses sourced through authorized channels. We are an independent reseller (not affiliated with Cisco Systems). Every license comes with a 100% working guarantee — full refund if activation fails. Cisco, IOS, ISR 4000, and related marks are registered trademarks of Cisco Systems, Inc.
Place order
Secure checkout via PayPal or card
Send device info
Run show license udi on your router
Receive license
License file emailed within 24 hours
Install on router
One CLI command — instant activation
Free support
We help if anything goes wrong
Disclaimer: This is an independent reseller. We are not affiliated with Cisco Systems. All licenses are genuine Cisco licenses issued through authorized channels. Cisco, IOS, ISR, ISR 4000, and related marks are registered trademarks of Cisco Systems, Inc.