Intel 721383-009 10/100 PCI Network Card NIC RJ-45 Fast Ethernet LAN Adapter

Intel 721383-009 10/100 PCI Network Card NIC RJ-45 Fast Ethernet LAN Adapter

The Intel 721383-009 is a single-port 10/100 Mbps Fast Ethernet PCI network interface card (NIC) designed for desktop and workstation computers with a standard PCI slot. It provides a wired RJ-45 Ethernet connection supporting both 10BASE-T and 100BASE-TX speeds, with automatic speed and duplex negotiation. The card installs into a standard full-height PCI slot and uses a full-height bracket.

Specifications & What's Included

• Manufacturer Part Number: 721383-009
• Interface: PCI (standard 32-bit)
• Network Speed: 10/100 Mbps (Fast Ethernet — 10BASE-T and 100BASE-TX)
• Ports: 1x RJ-45
• Indicators: ACT/LINK and 100TX status LEDs on bracket
• Form Factor: Standard full-height PCI card
• Country of Manufacture: Philippines (per PCB markings)
• Included: Card only — no drivers, cables, or accessories

Applications

PCI Fast Ethernet NICs like the Intel 721383-009 were a standard wired networking solution for desktop PCs and workstations from the late 1990s through the mid-2000s, when PCI was the dominant expansion bus before PCIe became widespread. Cards of this type are still useful today for maintaining or upgrading older desktop systems that lack a built-in Ethernet port, or where the onboard NIC has failed. They are commonly used in legacy industrial PCs, older server platforms, and vintage computing setups that retain a PCI bus. Intel was one of the leading NIC manufacturers of the era, with their chips well-supported across Windows, Linux, and BSD operating systems. The single RJ-45 port connects to standard 10/100 Ethernet switches, hubs, and routers using a straight-through Cat5 or Cat5e cable.