HPE 811546-B21 — Ethernet 1Gb 4-Port 366FLRT Adapter
What it is
811546-B21 is an HPE enterprise Ethernet network adapter designed for HPE ProLiant servers.
It’s a 4-port 1GbE adapter in the FlexibleLOM (FLR-T) form factor, providing dependable copper LAN connectivity for general-purpose and business workloads.
Why buyers pick 811546-B21 (plain English)
Multiple 1Gb ports in one card
Four Gigabit Ethernet ports offer flexibility for link aggregation, redundancy, and traffic segmentation.
FlexibleLOM form factor
Installs in the server’s FlexibleLOM slot, leaving PCIe slots free for storage, accelerators, or other expansion cards.
Reliable connectivity
1GbE remains a solid choice for management networks, VM traffic, backup links, and standard server uplinks.
Driver and firmware optimized for ProLiant
Firmware and drivers are validated by HPE, ensuring compatibility and predictable operation.
Copper Ethernet simplicity
RJ-45 connectivity works over standard copper infrastructure without optics.
60-second spec box (811546-B21)
Adapter type
Ethernet network adapter
Ports
4 × 1GbE BASE-T (RJ-45)
Speed
1GbE
Form factor
FlexibleLOM (FLR-T)
Host interface
FlexibleLOM slot
Media supported
Copper Ethernet (Cat5e/Cat6/Cat6a)
Platform
HPE ProLiant servers with FlexibleLOM support
Use case
General server networking, VLAN segmentation, redundant uplinks.
Where it fits (and when to choose something else)
Perfect for:
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ProLiant servers with FlexibleLOM slots
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General-purpose and management networks
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Redundant 1Gb uplinks
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Virtualization traffic and backup lanes
Choose something else if:
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You need higher bandwidth → 10/25/40Gb adapters
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You need fiber optics → SFP/SFP+ NICs
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You want to preserve FlexibleLOM for other uses → PCIe expansion adapters
TL;DR
811546-B21 is HPE’s 4-port 1Gb FlexibleLOM Ethernet adapter:
a reliable, ProLiant-validated NIC that delivers flexible 1Gb connectivity while keeping PCIe slots free.
