| Server Type | |
| Lot Quantity | |
| Warranty | 30 Days |
| Brand | Cisco |
| Manufacturer Part Number | ISR4431/K9 |
| Identifier | ISR4431/K9 |
| Series | Cisco 4000 Series Integrated Services Routers |
| Model Number | ISR4431/K9 |
| Form Factor | 1U Rackmount |
| Form | 1U |
| Bracket Size | |
| Network Interface | Ethernet (RJ-45), SFP (Combo) |
| Interface | Ethernet, SFP, USB, Console (RJ-45 & Mini-USB), Aux |
| Watts | 1x 400W PWR-4430-AC |
| Chassis | |
| Battery | |
| AC Adapter | Internal Power Supply (100–240 VAC auto-ranging) |
| Motherboard Support | |
| Expansion Slots | 4x NIM slots, 1x SM, 1x Onboard ISC slot |
| Dimms per Channel | |
| Socket | |
| Processor | Multicore Processor Architecture |
| Processors Installed | 1 |
| Processor Speed | |
| Speed | N/A |
| Processor Max Speed (Turbo Boost) | |
| CPU Brand | Cisco (Proprietary Data Plane Engine + Control Processor) |
| Processor Cores | |
| Number of Threads | |
| Hyper Threading | |
| Cache Per Processor | |
| Processor Main Features | |
| CPU Installed | |
| Compatible RAM | |
| FSB | |
| CPU Cache | |
| CPU Cooling System | |
| CPU Cooling System Brand | |
| CPU Cooling System Details | |
| Number of Fans | N/A |
| Fan Model | |
| Fan Support | |
| Fan Speed | |
| Fan Airflow | |
| Fan Noise | |
| Memory (RAM) | |
| Memory Size | |
| RAM Details | |
| RAM Type | |
| RAM Type | |
| RAM Speed | |
| Ram Speed | |
| Maximum RAM | |
| RAM Brand | |
| RAM/Rank | |
| Rank | |
| Module Type | |
| Module QTY | |
| ECC/FF | |
| Speed & ECC | |
| RAM Installed | |
| 1.8" Drive Bays | |
| 2.5" Drive Bays | |
| 3.5" Drive Bays | |
| M.2 Slots | |
| Storage | |
| HDD | |
| HDD Installed | |
| SSD | N/A |
| SSD Installed | N/A |
| Storage Type | |
| Storage Capacity | |
| Hard Disk Rotational Speed | |
| Read Speed | |
| Storage Cache | |
| Sector Size | |
| Hard Drive Trays | |
| Drive Blanks | |
| In tray | |
| Graphics Card | |
| Graphics Coprocessor | |
| Graphics Card Brand | |
| Graphics Card Series | |
| Graphics Card Memory | |
| Graphics Card Memory Type | |
| Graphics Card Clock Speed | |
| Graphics Card Boost Clock Speed | |
| Graphics Card CUDA Cores | |
| Graphics Card Memory Bus Width | |
| Graphics Card Interface | |
| Graphics Card Video Outputs | |
| Power Connectors | IEC C14 |
| GPU Installed | |
| Cache | |
| Transfer Rate | |
| Power Supply | Internal |
| PSU Type | AC, DC, or PoE |
| PSU Brand | Cisco |
| PSU QTY | 1 |
| PSU Form Factor | Internal Plug-in Module |
| PSU Features | Hot-swappable, Redundant options, PoE support |
| PSU Installed | 1x 400W PWR-4430-AC |
| Operating System | Cisco IOS XE |
| Software | |
| Software Features | |
| COA | |
| Battery Installed | |
| Bluetooth Installed | |
| Cabling Installed | |
| Camera Installed | |
| Media Drive Installed | |
| Heatsinks Installed | |
| RAID Controller | |
| Raid Installed | |
| Network Controller | Integrated Multicore Data Plane Processor |
| Rail Kit | |
| Bezel | |
| Optical Drive | |
| Special Features | |
| Package Contents | |
| Onboard GPU | |
| Bluetooth | |
| Wifi Installed | |
| WLAN | |
| LAN Speed | |
| Case Material | |
| Colors | |
| Drive Bays | |
| Maximum CPUs | |
| Max CPU's | |
| Number of Memory Slots | |
| DIMM Slots | |
| Memory Channels | |
| I/O Slots | |
| Ports | 4 x GE (Onboard), 1 x Console, 1 x Aux, 2 x USB |
| Front USB | |
| Front Audio Ports | |
| Rear USB | |
| Rear Audio Ports | |
| Video Ports | |
| RJ45 | |
| Power Consumption | |
| Keyboard | |
| Mouse | |
| Monitor | Not Included |
| Refresh Rate | |
| Screen Size | |
| Ears Included | No |
| Feature Sets | IP Base (Security, UC, AppX Licenses Optional) |
| Fixed Uplinks | 4 x 10/100/1000 Onboard Ports |
| Total 10/100/1000 Ethernet Ports | 4 (Onboard) |
| Available PoE Power | N/A |
| Switching Capacity | N/A (Router throughput-based platform) |
| Stacking Bandwidth | N/A |
| Total number of MAC addresses | N/A |
| Total number of IPv4 routes | 800,000 - 1,000,000+ (DRAM dependent) |
| FNF entries | Supported |
| DRAM | 4 GB |
| Flash | 8 GB |
| VLAN IDs | 4094 |
| Total switched virtual interfaces (SVIs) | N/A (Router - uses routed subinterfaces) |
| Jumbo frame | 9216 Bytes |
| Total routed ports per stack | N/A |
| Number of access points per switch/stack | N/A |
| Number of wireless clients per switch | N/A |
| Total number of WLANs per switch | N/A |
| Wireless bandwidth per switch | N/A |
| Supported Aironet access point series | N/A |
| Forwarding Rate | 500 Mbps to 1 Gbps Aggregate |
| HSEC Appx Secruity9 License's | |
| ECC/FF | |
| Scalability | |
| Country of Origin | |
| PCSP SKU | NSB 443193 |
| Extended Warranty for this listing: | Click Here |
| Our other eBay listings: | Click Here |
The Cisco ISR4431/K9 is a modular 1U enterprise Integrated Services Router designed for WAN connectivity, branch networking, VPN, security, application services, and advanced routing deployments.
This configuration includes one Cisco PWR-4430-AC 400W AC power supply along with HSEC-K9, APPXK9, and SecurityK9 license functionality as specified for this unit.
The ISR4431 provides four onboard logical Gigabit Ethernet interfaces, three Network Interface Module slots, one Integrated Services Card slot, and Cisco IOS XE software architecture. The platform provides 500Mbps aggregate throughput at its base performance level and can be upgraded to 1Gbps with the appropriate Cisco Performance license.
Manufacturer: Cisco
Series: Cisco 4000 Series ISR
Model: ISR4431/K9
Product Type: Integrated Services Router
Onboard Ethernet: 4x Logical Gigabit Ethernet
Base Aggregate Throughput: 500Mbps
Performance Upgrade: Up to 1Gbps with FL-44-PERF-K9
Control-Plane DRAM: 4GB Default
Data-Plane DRAM: 2GB Default
Flash: 8GB Default
Power Supply: 1x PWR-4430-AC 400W AC
License Features: HSEC-K9, APPXK9, SecurityK9
Operating System: Cisco IOS XE
Form Factor: 1U Rackmount
PC Server & Parts (PCSP) is a refurbisher and seller of OEM and surplus technology hardware.
We have been doing business from our location in Michigan for over 25 years, and have served over 100,000 customers worldwide.
We are proud to offer our customers high-end IT hardware priced 50% to 90% less than new retail cost. All equipment that leaves our facility
has been refurbished and undergone a 24-point inspection by our expert staff. With our super-fast delivery and exceptional customer service, we look forward to serving you.
If you have a question or concern please contact us here.

PCSP specializes in obtaining large volumes of refurbished IT hardware. If your business requires a large order of servers, workstations, or other gear – let PCSP find the IT hardware your business needs, so you can focus on doing what you do best.
![]() |
![]() |
|
Forecast Needs |
Pricing Thresholds |
Dedicated Inventory |
| PCSP will develop a forecast of your needs to get your business ahead of the market. | Our pricing thresholds are designed to secure product within your timeframe. | All specified inventory goes towards fulfillment until your order is completed. |
We understand that from time to time the need to return an item may occur. Please read below for a detailed overview of our return policy:
If you have any questions, feel free to reach us: here
Our office hours are Monday through Friday - 9:00am to 5:00pm EST.