the contrib/dhcp-lease-list.pl script is great! unfortunately, it seems
it trims the MAC addresses when the oui lookup is enabled, probably
because of garbage in the oui.txt file. For example:

MAC                IP              hostname       valid until         manufacturer
===============================================================================================
80:6c:1b:2e:54:f0  192.168.0.186   android-4e25a30330d9195a2015-12-12 17:41:18 Motorola Mobility LLC, a Lenovo Company
        :f9:9d:d7  192.168.0.182   iMac-de-mac-4962015-12-12 18:22:02 Apple, Inc.
        :35:24:50  192.168.0.189   SimonVV        2015-12-12 18:06:01 Apple, Inc.
e8:9a:8f:6e:0f:60  192.168.0.127   angela         2015-12-12 17:42:52 Quanta Computer Inc.
ec:55:f9:c5:f2:55  192.168.0.179   angela         2015-12-12 17:40:18 Hon Hai Precision Ind. Co.,Ltd.
            9e:dc  192.168.0.183   -NA-           2015-12-12 17:42:59 Private
f4:ec:38:e2:f9:67  192.168.0.185   -NA-           2015-12-12 17:41:31 TP-LINK TECHNOLOGIES CO.,LTD.
f8:d1:11:b7:5a:62  192.168.0.184   -NA-           2015-12-12 17:43:05 TP-LINK TECHNOLOGIES CO.,LTD.

notice the blank spaces with some manufacturers. i suspect some control
characters are garbling the display. The following patch cleans up the
whitespace on both sides of the manufacturer string, which fixes the
problem for me. It also fixes the width of the hostname field which was
garbling the display above:

--- dhcp-lease-list.pl.orig	2015-12-12 12:30:00.000000000 -0500
+++ dhcp-lease-list.pl	2015-12-12 12:54:31.000000000 -0500
@@ -41,7 +41,7 @@
     if (defined $oui) {
 	$manu = join('-', ($_[0] =~ /^(..):(..):(..):/));
 	$manu = `grep -i '$manu' $oui | cut -f3`;
-	chomp($manu);
+	$manu =~ s/^\s+|\s+$//g;
     }
 
     return $manu;
@@ -142,7 +142,7 @@
     }
     foreach (@leases) {
        if ($opt_format eq 'human') {
-	   printf("%-19s%-16s%-15s%-20s%-20s\n",
+	   printf("%-19s%-16s%-14.14s %-20s%-20s\n",
 		  $_->{'mac'},       # MAC
 		  $_->{'ip'},        # IP address
 		  $_->{'hostname'},  # hostname

The resulting output looks much better:

MAC                IP              hostname       valid until         manufacturer
===============================================================================================
80:6c:1b:2e:54:f0  192.168.0.186   android-4e25a3 2015-12-12 17:55:44 Motorola Mobility LLC, a Lenovo Company
90:27:e4:f9:9d:d7  192.168.0.182   iMac-de-mac-49 2015-12-12 18:22:02 Apple, Inc.
b8:8d:12:35:24:50  192.168.0.189   SimonVV        2015-12-12 18:06:01 Apple, Inc.
e8:9a:8f:6e:0f:60  192.168.0.127   angela         2015-12-12 17:55:45 Quanta Computer Inc.
ec:55:f9:c5:f2:55  192.168.0.179   angela         2015-12-12 17:58:25 Hon Hai Precision Ind. Co.,Ltd.
f0:4f:7c:3f:9e:dc  192.168.0.183   kindle-6814334 2015-12-12 17:58:05 Private
f4:ec:38:e2:f9:67  192.168.0.185   -NA-           2015-12-12 17:56:31 TP-LINK TECHNOLOGIES CO.,LTD.
f8:d1:11:b7:5a:62  192.168.0.184   -NA-           2015-12-12 17:58:05 TP-LINK TECHNOLOGIES CO.,LTD.

Thanks!

A.

-- 
N'aimer qu'un seul est barbarie, car c'est au détriment de tous les
autres. Fût-ce l'amour de Dieu.
                        - Nietzsche, "Par delà le bien et le mal"