diff --git a/sys/pci/if_rl.c b/sys/pci/if_rl.c
index 6d2c59e11e57..58e998ef790c 100644
--- a/sys/pci/if_rl.c
+++ b/sys/pci/if_rl.c
@@ -158,6 +158,8 @@ static struct rl_type rl_devs[] = {
 		"Corega FEtherII CB-TXD" },
 	{ PEPPERCON_VENDORID, PEPPERCON_DEVICEID_ROLF,
 		"Peppercon AG ROL-F" },
+	{ PLANEX_VENDORID, PLANEX_DEVICEID_FNW3800TX,
+		"Planex FNW-3800-TX" },
 	{ 0, 0, NULL }
 };
 
@@ -987,7 +989,8 @@ rl_attach(dev)
 	    rl_did == RT_DEVICEID_8138 || rl_did == DLINK_DEVICEID_530TXPLUS ||
 	    rl_did == DLINK_DEVICEID_690TXD ||
 	    rl_did == COREGA_DEVICEID_FETHERCBTXD ||
-	    rl_did == COREGA_DEVICEID_FETHERIICBTXD)
+	    rl_did == COREGA_DEVICEID_FETHERIICBTXD ||
+	    rl_did == PLANEX_DEVICEID_FNW3800TX)
 		sc->rl_type = RL_8139;
 	else if (rl_did == RT_DEVICEID_8129)
 		sc->rl_type = RL_8129;
diff --git a/sys/pci/if_rlreg.h b/sys/pci/if_rlreg.h
index 7fca3cabc73c..3cf5a7c49533 100644
--- a/sys/pci/if_rlreg.h
+++ b/sys/pci/if_rlreg.h
@@ -500,6 +500,16 @@ struct rl_softc {
  */
 #define PEPPERCON_DEVICEID_ROLF			0x8139
 
+/*
+ * Planex Communications, Inc. vendor ID
+ */
+#define PLANEX_VENDORID                      0x14ea
+
+/*
+ * Planex FNW-3800-TX device ID
+ */
+#define PLANEX_DEVICEID_FNW3800TX                 0xab07
+
 /*
  * PCI low memory base and low I/O base register, and
  * other PCI registers.