diff --git a/README.rst b/README.rst
index 8520dc0..09cc6e5 100644
--- a/README.rst
+++ b/README.rst
@@ -265,6 +265,12 @@ block. The value for each entry is a boolean, *i.e.*::
 Note that due to a limitation of the configuration parser, ':' byte separator
 in MAC addresses is not allowed, please use '-' separator.
 
+It is possible to use a mask syntax to specify a range of MACs addresses, for
+example:
+
+  AA-BB-CC/24 = enable
+
+Accepts all Ethernet addresses whose OUI is AA:BB:CC.
 
 ``[static_dhcp]`` section
 .........................
@@ -346,6 +352,8 @@ likely needed.
 Each entry is a MAC address, using the ``-`` byte separator, with a boolean
 value.
 
+This section also accepts mask syntax, see ``[mac]`` section for details.
+
 
 ``[tftpd]`` section
 ...................
diff --git a/pybootd/etc/pybootd.ini b/pybootd/etc/pybootd.ini
index 00b89e6..f57fdcc 100644
--- a/pybootd/etc/pybootd.ini
+++ b/pybootd/etc/pybootd.ini
@@ -32,11 +32,12 @@ default = pxelinux.0
 [buggy_clients]
 ; list of stupid clients (mostly Intel's) that ignores valid subnet broadcast
 ; and require global DHCP offer broadcast
-1C-69-7A-00-6F-4C = yes
+1C-69-7A/24 = yes
 
 [mac]
 ; see doc: byte separator should be defined with dash, not column
 00-AA-55-12-34-56 = enable
+1C-69-7A/24 = enable
 
 [uuid]
 12345678-abcd-ef00-1111-abcdefabcdef = enable