PCI\VEN_10EC&DEV_8125
RTL8125 2.5GbE Controller driver
PCI\VEN_10EC&DEV_8125 is the Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller, an Ethernet device. Without it the wired port shows as an Ethernet Controller under Other devices and the cable does nothing. Get it from Windows Update or your PC maker first; the chip maker's own package is on intel.com.
Device details
| Hardware ID | PCI\VEN_10EC&DEV_8125 |
|---|---|
| Device name | RTL8125 2.5GbE Controller |
| Maker | Realtek Semiconductor Co., Ltd. (PCI vendor ID 10EC) |
| Device type | Ethernet |
| Driver guide | Fix Ethernet Controller driver |
| Latest official package | Intel Ethernet Adapter Complete Driver Pack 31.3, October 16, 2026 |
| Known OEM variants | 1 |
PCs and boards that use this chip
Each line is a subsystem ID: the full hardware ID ends in SUBSYS_ plus these eight characters when the RTL8125 2.5GbE Controller is built into that maker's product.
| Full hardware ID ending | Maker | Product |
|---|---|---|
SUBSYS_20224C52 | LR-LINK | LRES2022PT Single-port 2.5Gb Ethernet Network Adapter |
If your SUBSYS matches a laptop or board maker in this list, that maker's support page has the version tested for your model.
How to install the driver for RTL8125 2.5GbE Controller
- Confirm the ID. In Device Manager, right-click the device, open Properties, then Details, and pick Hardware Ids. The first line should start with
PCI\VEN_10EC&DEV_8125. - Try Windows Update. Settings, Windows Update, Advanced options, Optional updates. Network drivers may appear here once another connection works, such as Wi-Fi or a phone hotspot.
- Check your PC maker. Enter your model or serial number on its support site and look under Networking or LAN.
- Use the chip maker's package. Intel Ethernet Adapter Complete Driver Pack on intel.com. Our fix ethernet controller driver guide explains which package fits.
- Restart and check. Plug in the cable and check that Windows shows a wired connection.
Other Realtek ethernet IDs
Device names: The PCI ID Repository, public data. We never host driver files: downloads come from the maker.