Specific Dell Inc. devices show up as unknown

[L1-0]

Hello,

i am encountering the following issue:

on Version 1.10.0 whenever i scan my local device network a specific device by Dell with the vendor ID 28:00:af and ac:91:a1 show up as unknown, although they are in the ieee-oui.txt

References:
https://github.com/royhills/arp-scan/blob/master/ieee-oui.txt#L31862
https://github.com/royhills/arp-scan/blob/master/ieee-oui.txt#L31231

Here's the log:

$ arp-scan 10.1.69.36:255.255.255.0
Interface: eth0, type: EN10MB, MAC: d0:ad:08:b8:a8:b4, IPv4: 10.1.69.36
WARNING: host part of 10.1.69.36:255.255.255.0 is non-zero
Starting arp-scan 1.10.0 with 256 hosts (https://github.com/royhills/arp-scan)
10.1.69.1	3a:63:17:15:8e:68	(Unknown: locally administered)
10.1.69.12	00:be:43:d0:67:82	Dell Inc.
10.1.69.16	00:be:43:d0:67:87	Dell Inc.
10.1.69.21	98:e7:43:3c:c9:28	Dell Inc.
10.1.69.22	c4:5a:b1:91:b6:ac	Dell Inc.
10.1.69.23	c4:5a:b1:91:b9:2c	Dell Inc.
10.1.69.25	90:8d:6e:1f:15:3b	Dell Inc.
10.1.69.27	00:be:43:d0:67:38	Dell Inc.
10.1.69.30	90:8d:6e:1f:16:5e	Dell Inc.
10.1.69.41	00:be:43:8e:c1:e7	Dell Inc.
10.1.69.56	a0:29:19:cc:71:1a	Dell Inc.
10.1.69.57	28:00:af:17:89:7c	(Unknown)
10.1.69.62	90:8d:6e:20:06:62	Dell Inc.
10.1.69.67	70:b5:e8:2a:67:aa	Dell Inc.
10.1.69.77	6c:2b:59:39:70:c9	Dell Inc.
10.1.69.82	a0:29:19:b8:9e:1d	Dell Inc.
10.1.69.110	a0:29:19:bf:26:9f	Dell Inc.
10.1.69.115	00:be:43:d0:67:3b	Dell Inc.
10.1.69.132	c0:3e:ba:17:88:12	Dell Inc.
10.1.69.176	a4:bb:6d:14:ff:15	Dell Inc.
10.1.69.181	ac:91:a1:ae:71:5d	(Unknown)
10.1.69.182	ac:91:a1:ae:71:5e	(Unknown)

26 packets received by filter, 0 packets dropped by kernel
Ending arp-scan 1.10.0: 256 hosts scanned in 1.976 seconds (129.55 hosts/sec). 22 responded

This just jumped into my eye because that network is all Dell.

Greetings

[L1-0]

Ahh bugger i think i know whats happened here:

I got the latest release with the install of the operating system but never cared enough to manually update the ieee-oui.txt file.

Nevermind...