diff --git a/share/man/man4/ddb.4 b/share/man/man4/ddb.4
--- a/share/man/man4/ddb.4
+++ b/share/man/man4/ddb.4
@@ -24,7 +24,7 @@
 .\" any improvements or extensions that they make and grant Carnegie Mellon
 .\" the rights to redistribute these changes.
 .\"
-.Dd May 24, 2025
+.Dd May 28, 2025
 .Dt DDB 4
 .Os
 .Sh NAME
@@ -604,6 +604,14 @@
 modifier will print command line arguments for each process.
 .\"
 .Pp
+.It Ic show Cm all tcpcbs Ns Op Li / Ns Cm l
+Show the same output as "show tcpcb" does, but for all
+TCP control blocks within the system.
+Using the
+.Cm l
+modifier will limit the output to TCP control blocks, which are locked.
+.\"
+.Pp
 .It Ic show Cm all trace
 .It Ic alltrace
 Show a stack trace for every thread in the system.
diff --git a/sys/netinet/tcp_usrreq.c b/sys/netinet/tcp_usrreq.c
--- a/sys/netinet/tcp_usrreq.c
+++ b/sys/netinet/tcp_usrreq.c
@@ -3222,4 +3222,27 @@
 
 	db_print_tcpcb(tp, "tcpcb", 0);
 }
+
+DB_SHOW_ALL_COMMAND(tcpcbs, db_show_all_tcpcbs)
+{
+	VNET_ITERATOR_DECL(vnet_iter);
+	struct inpcb *inp;
+	bool only_locked;
+
+	only_locked = strchr(modif, 'l') != NULL;
+	VNET_FOREACH(vnet_iter) {
+		CURVNET_SET(vnet_iter);
+		CK_LIST_FOREACH(inp, &V_tcbinfo.ipi_listhead, inp_list) {
+			if (only_locked &&
+			    inp->inp_lock.rw_lock == RW_UNLOCKED)
+				continue;
+			db_print_tcpcb(intotcpcb(inp), "tcpcb", 0);
+			if (db_pager_quit)
+				break;
+		}
+		CURVNET_RESTORE();
+		if (db_pager_quit)
+			break;
+	}
+}
 #endif