# StarTech USB 2.0 to Gigabit Ethernet NIC Network Adapter (USB21000S2)

- Category: Wired Network Adapter
- Brand: StarTech
- Model: USB21000S2
- Part number: USB21000S2
- Price (US): $49.75
- Price last checked: 2026-08-05
- Rating: 3.9/5 from 105 Amazon reviews
- Warranty: 2 years
- Product page: https://buildmypc.net/component-details/wired-network-adapter/startech-usb21000s2/

## Specifications

| Spec | Value |
| --- | --- |
| Brand | StarTech |
| Model | USB21000S2 |
| Ports | 1 x 1000 Mbit/s |
| Interface | USB 2.0 |
| Color | Black |

## Key Features

- Compatible with Gigabit Ethernet networks and powered via USB for versatility and portability as an add-on or replacement
- The Gigabit USB adapter helps conserve system resources, using built-in NDIS6 Checksum and Large Send Offload support and Jumbo Frames
- The USB Gigabit Ethernet adapter is backed by a StarTech 2-year warranty and free lifetime technical support, ensuring reliability
- USB to RJ45 adapter supports Gigabit networking over USB 2.0 with up to 480 Mbps of bandwidth
- IEEE 802.3, 802.3u and 802.3ab (10BASE-T, 100BASE-TX, and 1000BASE-T) compatible
- Jumbo Frame support up to 9 KB
- Powered directly from the USB ports
- Supports Microsoft NDIS 6.2 Checksum Offload (IPv4, IPv6, TCP, UDP) and Large send Offload

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