--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utils/themwi-check-own.c	Sun Jun 26 14:17:26 2022 -0800
@@ -0,0 +1,35 @@
+/*
+ * This utility performs a lookup in ThemWi number database to see
+ * if a given NANP number is owned by us.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <syslog.h>
+
+main(argc, argv)
+	char **argv;
+{
+	char nanp[11];
+
+	if (argc != 2) {
+usage:		fprintf(stderr, "usage: %s 10-digit-number\n", argv[0]);
+		exit(1);
+	}
+	if (grok_number_string(argv[1], 1) != 10)
+		goto usage;
+	dehyphen_number_string(argv[1], nanp);
+	if (!is_nanp_valid_prefix(nanp)) {
+		fprintf(stderr, "error: number violates NANP rules\n");
+		exit(1);
+	}
+	openlog("themwi-check-own", 0, LOG_LOCAL5);
+	if (read_number_db() < 0) {
+		fprintf(stderr, "error reading number database\n");
+		exit(1);
+	}
+	printf("+1-%.3s-%.3s-%s is %s\n", nanp, nanp+3, nanp+6,
+		is_nanp_locally_owned(nanp) ? "locally owned"
+					    : "NOT owned by us");
+	exit(0);
+}