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diff --git a/stdnum/au/acn.py b/stdnum/au/acn.py
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+++ b/stdnum/au/acn.py
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+# acn.py - functions for handling Australian Company Numbers (ACNs)
+#
+# Copyright (C) 2016 Vincent Bastos
+# Copyright (C) 2016 Arthur de Jong
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+"""ACN (Australian Company Number).
+
+The Australian Company Number (ACN) is a company identifier issued by the
+Australian Securities and Investments Commission.
+
+More information:
+
+* https://en.wikipedia.org/wiki/Australian_Company_Number
+
+>>> validate('004 085 616')
+'004085616'
+>>> validate('010 499 966')
+'010499966'
+>>> validate('999 999 999')
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+>>> format('004085616')
+'004 085 616'
+>>> to_abn('002 724 334')
+'43002724334'
+"""
+
+from stdnum.exceptions import *
+from stdnum.util import clean
+
+
+def compact(number):
+    """Convert the number to the minimal representation. This strips the
+    number of any valid separators and removes surrounding whitespace."""
+    return clean(number, ' ').strip()
+
+
+def calc_check_digit(number):
+    """Calculate the checksum."""
+    return str((sum(int(n) * (i - 8) for i, n in enumerate(number))) % 10)
+
+
+def validate(number):
+    """Checks to see if the number provided is a valid ACN. This checks the
+    length, formatting and check digit."""
+    number = compact(number)
+    if not number.isdigit():
+        raise InvalidFormat()
+    if len(number) != 9:
+        raise InvalidLength()
+    if calc_check_digit(number) != number[-1]:
+        raise InvalidChecksum()
+    return number
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid ACN. This checks the
+    length, formatting and check digit."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+
+def format(number):
+    """Reformat the passed number to the standard format."""
+    number = compact(number)
+    return ' '.join((number[0:3], number[3:6], number[6:]))
+
+
+def to_abn(number):
+    """Convert the number to an Australian Business Number (ABN)."""
+    from stdnum.au import abn
+    number = compact(number)
+    return abn.calc_check_digits(number) + number