TYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, sc, 0,
+	    vtnet_sysctl_features, "A", "Features");
 	SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "flags",
 	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, sc, 0,
 	    vtnet_sysctl_flags, "A", "Flags");
diff --git a/sys/dev/virtio/network/virtio_net.h b/sys/dev/virtio/network/virtio_net.h
index e61a4a993052..f4256664fba8 100644
--- a/sys/dev/virtio/network/virtio_net.h
+++ b/sys/dev/virtio/network/virtio_net.h
@@ -57,6 +57,14 @@
 #define VIRTIO_NET_F_CTRL_MAC_ADDR	 (1ULL << 23) /* Set MAC address */
 #define VIRTIO_NET_F_SPEED_DUPLEX	 (1ULL << 63) /* Device set linkspeed and duplex */
 
+/* virtio net feature flag descriptions for use with printf(9) %b identifier. */
+#define VIRTIO_NET_FEATURE_BITS \
+    "\20\200CSUM\201GUEST_CSUM\202CTRL_GUEST_OFFLOADS\203MTU\205MAC\206GSO" \
+    "\207GUEST_TSO4\210GUEST_TSO6\211GUEST_ECN\212GUEST_UFO\213HOST_TSO4" \
+    "\214HOST_TSO6\215HOST_ECN\216HOST_UFO\217MRG_RXBUF\220STATUS\221CTRL_VQ" \
+    "\222CTRL_RX\223CTRL_VLAN\224CTRL_RX_EXTRA\225GUEST_ANNOUNCE\226MQ" \
+    "\227CTRL_MAC_ADDR\277SPEED_DUPLEX"
+
 #define VIRTIO_NET_S_LINK_UP	1	/* Link is up */
 #define VIRTIO_NET_S_ANNOUNCE	2	/* Announcement is needed */