Replacement for ISR4331-K9: Drop-In Alternatives We Stock
Looking for a replacement for the ISR4331-K9 (Cisco ISR4331/K9 ISR 3 x 10/100/1000 Ports Gigabit Ethernet Modular Router)? Pro Disk Network ships Cisco drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the ISR4331-K9
| SKU | ISR4331-K9 |
|---|---|
| Product | Cisco ISR4331/K9 ISR 3 x 10/100/1000 Ports Gigabit Ethernet Modular Router |
| Current price | $270.51 |
| Stock status | In Stock |
| Detail page | View ISR4331-K9 › |
Drop-in replacements for ISR4331-K9
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
C9300L-24T-4G-E - Cisco Catalyst C9300L-24T 24 x Ports 10/100/1000 + 4 x Uplink Ports Layer 3 Managed Gigabit Ethernet Switch
SKU: C9300L-24T-4G-E
Price: $1,199.63
C9300L-24P-4G-E - Cisco Catalyst C9300L-24P POE+ 24 x Ports 10/100/1000 + 4xUplink Ports Layer 3 Managed Gigabit Ethernet Switch
SKU: C9300L-24P-4G-E
Price: $2,861.83
Cisco ISR4321-SEC/K9 ISR 2-Port 4-Slot 10/100/1000Base-T Gigabit Ethernet Integrated Service Router
SKU: ISR4321-SEC-K9
Price: $404.22
IE-1000-4T1T-LM - Cisco Industrial Ethernet IE-1000-4T1T 4 x Ports 10/100Base-TX + 2 x SFP Layer 2 Managed Fast Ethernet Switch
SKU: IE-1000-4T1T-LM
Price: $1,046.86
PWR-4450-POE-AC - Cisco 1000-Watts 100 / 240V AC Redundant Hot-Pluggable Power Supply for ISR 4450 / 4350
SKU: PWR-4450-POE-AC
Price: $1,786.11
WS-C3560CG-8PC-S - Cisco Catalyst PoE RJ-45 8 x Ports 10/100/1000Base-TX + 2 x combo Gigabit SFP Gigabit SFP managed desktop Gigabit Ethernet Switch
SKU: WS-C3560CG-8PC-S
Price: $3,642.95
CBS350-24P-4X - Cisco Business 350 Series CBS350-24P-4X 24 x Ports 10/100/1000Base-T PoE+ + 4 x Ports 10 Gigabit SFP+ Rack-Mountable Layer 3 Managed Gigabit Ethernet Network Switch
SKU: CBS350-24P-4X
Price: $3,610.53
MS210-24P-HW - Cisco Meraki MS210-24P POE RJ-45 24 x Ports 10/100/1000Base-T + 4 x SFP Ports + 2 x Stack Ports Layer 2 Gigabit Ethernet Access Switch
SKU: MS210-24P-HW
Price: $3,168.42
C1111-4P - Cisco ISR 1100 4-Port Gigabit Ethernet WAN Integrated Service Router
SKU: C1111-4P
Price: $579.49
C1101-4P - Cisco ISR 1100 4-Port Gigabit Ethernet WAN Integrated Service Router
SKU: C1101-4P
Price: $1,237.89
C1111-8PWB - Cisco ISR 1100 8-Port IEEE 802.11ac Dual Gigabit Ethernet Router
SKU: C1111-8PWB
Price: $2,328.42
C1111-8P - Cisco ISR 1100 8-Port Gigabit Ethernet WAN Integrated Service Router
SKU: C1111-8P
Price: $3,136.89
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.