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UTM 9.353-4 SG230 DHCP with unknown hostname

From the DHCP Network Services IPv4 Lease Table, we found there is number of record without hostname.

Hostname MAC address IPv4 address Lease start Lease expiry Make static
[unknown] 7c:01:91:84:xx:xx 192.168.1.1x 2016/03/04 15:46:35 2016/03/05 15:46:35
Make static
[unknown] c4:9a:02:29:xx:xx 192.168.1.1x 2016/02/27 09:19:13 2016/02/28 09:02:18
Make static
[unknown] 04:1e:64:ef:xx:xx 192.168.1.1xx 2016/03/02 08:32:14 2016/03/03 08:32:14
Make static
[unknown] 5c:f8:a1:d1:xx:xx 192.168.1.1xx 2016/03/04 16:00:21 2016/03/05 13:46:57
Make static

For example to lookup the vendor code : http://aruljohn.com/mac/041E64

The device is Apple Inc.

http://aruljohn.com/mac/0018DE

This is Intel PC in Windows

http://aruljohn.com/mac/001D7D

This is GIGA-BYTE 

Is there anyone similar experience?



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