Index: usr.sbin/arp/arp.8
===================================================================
--- usr.sbin/arp/arp.8
+++ usr.sbin/arp/arp.8
@@ -28,7 +28,7 @@
 .\"     @(#)arp.8	8.1 (Berkeley) 6/6/93
 .\" $FreeBSD$
 .\"
-.Dd July 13, 2020
+.Dd August 2, 2021
 .Dt ARP 8
 .Os
 .Sh NAME
@@ -37,12 +37,12 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl -libxo Ar options
-.Op Fl n
+.Op Fl Dn
 .Op Fl i Ar interface
 .Ar hostname
 .Nm
 .Op Fl -libxo Ar options
-.Op Fl n
+.Op Fl Dn
 .Op Fl i Ar interface
 .Fl a
 .Nm
@@ -92,6 +92,10 @@
 flag, deletes all of the current
 .Tn ARP
 entries.
+.It Fl D
+Display route cache statistics for each
+.Tn ARP
+entry.
 .It Fl d
 A super-user may delete an entry for the host called
 .Ar hostname
Index: usr.sbin/arp/arp.c
===================================================================
--- usr.sbin/arp/arp.c
+++ usr.sbin/arp/arp.c
@@ -100,6 +100,7 @@
 static int valid_type(int type);
 
 static int nflag;	/* no reverse dns lookups */
+static int Dflag;
 static char *rifname;
 
 static time_t	expire_time;
@@ -129,11 +130,14 @@
 	if (argc < 0)
 		exit(1);
 
-	while ((ch = getopt(argc, argv, "andfsSi:")) != -1)
+	while ((ch = getopt(argc, argv, "andDfsSi:")) != -1)
 		switch(ch) {
 		case 'a':
 			aflag = 1;
 			break;
+		case 'D':
+			Dflag = 1;
+			break;
 		case 'd':
 			SETFUNC(F_DELETE);
 			break;
@@ -677,6 +681,11 @@
 		break;
 	}
 
+	if (Dflag) {
+		xo_emit(" lookup-count {:lookup-count/%lu}", rtm->rtm_rmx.rmx_recvpipe);
+		xo_emit(" cache-hit {:cache-hit/%lu}", rtm->rtm_rmx.rmx_sendpipe);
+	}
+
 	xo_emit("\n");
 
 	xo_close_instance("arp-cache");