StarTech.com
StarTech USB 2.0 to Gigabit Ethernet NIC Network Adapter (USB21000S2)
*Price sourced from Amazon.com. Last updated 2026-05-26. Price and availability subject to change.
Bottom line: The StarTech USB 2.0 to Gigabit Ethernet NIC Network Adapter (USB21000S2) is a niche pick — read recent reviews before buying in the networking cards category, priced around $49.75, rated 3.6★ across 112 verified Amazon reviews. Read recent reviews carefully before committing.
SpecPicks Verdict
SpecPicks classifies StarTech USB 2.0 to Gigabit Ethernet NIC Network Adapter (USB21000S2) as a niche pick — read recent reviews before buying in the networking cards category, based on 112 verified Amazon reviews and our ranking model that weights rating × review-volume × price-fit. StarTech.com's positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for networking cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ IEEE 802.3, 802.3u and 802.3ab (10BASE-T, 100BASE-TX, and 1000BASE-T) compatible
- ✓ Backed by StarTech.com's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Below-average customer rating — read recent reviews before buying
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
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
Full Specifications
| Brand | StarTech.com |
|---|---|
| Color | Black |
| Unit Count | 1 Count |
| Connectivity | USB |
| Model Number | USB21000S2 |
| Mfr Part Number | USB21000S2 |
| Compatible Devices | Desktop |
| Data Link Protocol | Ethernet, Gigabit Ethernet, IEEE 802.1Q, IEEE 802.3 |
| Data Transfer Rate | 480 Megabits Per Second |
| Hardware Interface | Ethernet, USB 2.0 |
| Warranty Description | 2 year warranty |
| External Testing Certification | CE, FCC |
| Compatible Operating System Family | Windows |
| Global Trade Identification Number | 00065030847445, 00163120321131, 00778889503317 |
Ready to buy?
StarTech USB 2.0 to Gigabit Ethernet NIC Network Adapter (USB21000S2) is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-05-26. Price and availability subject to change.
Related Networking Cards
