diff --git a/sbin/sysctl/sysctl.8 b/sbin/sysctl/sysctl.8
--- a/sbin/sysctl/sysctl.8
+++ b/sbin/sysctl/sysctl.8
@@ -28,7 +28,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd August 18, 2023
+.Dd October 14, 2024
 .Dt SYSCTL 8
 .Os
 .Sh NAME
@@ -111,6 +111,8 @@
 .Nm
 for collecting data from a variety of machines (not all of which
 are necessarily running exactly the same software) easier.
+.It Fl J
+Display only VNET sysctl variables (CTLFLAG_VNET).
 .It Fl l
 Show the length of variables along with their values.
 This option cannot be combined with the
diff --git a/sbin/sysctl/sysctl.c b/sbin/sysctl/sysctl.c
--- a/sbin/sysctl/sysctl.c
+++ b/sbin/sysctl/sysctl.c
@@ -63,7 +63,7 @@
 
 static int	aflag, bflag, Bflag, dflag, eflag, hflag, iflag;
 static int	Nflag, nflag, oflag, qflag, tflag, Tflag, Wflag, xflag;
-static bool	Fflag, lflag;
+static bool	Fflag, Jflag, lflag;
 
 static int	oidfmt(int *, int, char *, u_int *);
 static int	parsefile(const char *);
@@ -136,7 +136,7 @@
 	setbuf(stdout,0);
 	setbuf(stderr,0);
 
-	while ((ch = getopt(argc, argv, "AabB:def:FhilNnoqtTwWxX")) != -1) {
+	while ((ch = getopt(argc, argv, "AabB:def:FhiJlNnoqtTwWxX")) != -1) {
 		switch (ch) {
 		case 'A':
 			/* compatibility */
@@ -169,6 +169,9 @@
 		case 'i':
 			iflag = 1;
 			break;
+		case 'J':
+			Jflag = true;
+			break;
 		case 'l':
 			lflag = true;
 			break;
@@ -1052,6 +1055,10 @@
 	if (Tflag && (kind & CTLFLAG_TUN) == 0)
 		return (1);
 
+	/* if Jflag then only list sysctls that are vnet variables. */
+	if (Jflag && (kind & CTLFLAG_VNET) == 0)
+		return (1);
+
 	if (Nflag) {
 		printf("%s", name);
 		return (0);