From f29f5b82a458901bd0e591d6968fb8bdb4e3b0d9 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Einar=20J=C3=B8rgen=20Haraldseid?= <einar@haraldseid.net>
Date: Sat, 18 Apr 2026 12:05:05 +0200
Subject: [PATCH 1/1] Kjapt lite MAC-vendor-oppslagscript

---
 macvendor.sh | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100755 macvendor.sh

diff --git a/macvendor.sh b/macvendor.sh
new file mode 100755
index 0000000..c4dd1b2
--- /dev/null
+++ b/macvendor.sh
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+prefixesfile=/home/einar/ownCloud/Datadumper/master_oui.txt
+
+if [[ ! -f $prefixesfile ]]; then
+  echo "Could not find MAC prefixes file $prefixesfile, please download from https://raw.githubusercontent.com/Ringmast4r/OUI-Master-Database/main/LISTS/master_oui.txt and save to some suitable "
+  exit 1
+fi
+
+hexregex="^[[:xdigit:]]{6,12}$"
+
+prefix=${1//:/}      # strip :
+prefix=${prefix//-/} # strip -
+prefix=${prefix//./} # strip .
+prefix=${prefix^^}   # uppercase
+
+if [[ $prefix =~ $hexregex ]]; then
+  prefix=${prefix:0:6} # we only need first 6 chars
+  grep "$prefix" "$prefixesfile"
+else
+  echo "Input parameter does not resemble a MAC address"
+  exit 1
+fi
-- 
2.47.3