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diff --git a/rpkid/rpki/ipaddrs.py b/rpkid/rpki/ipaddrs.py
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+++ b/rpkid/rpki/ipaddrs.py
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+# $Id$
+
+# Copyright (C) 2007--2008  American Registry for Internet Numbers ("ARIN")
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND ARIN DISCLAIMS ALL WARRANTIES WITH
+# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+# AND FITNESS.  IN NO EVENT SHALL ARIN BE LIABLE FOR ANY SPECIAL, DIRECT,
+# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+# PERFORMANCE OF THIS SOFTWARE.
+
+"""Classes to represent IP addresses.
+
+Given some of the other operations we need to perform on them, it's
+most convenient to represent IP addresses as Python "long" values.
+The classes in this module just wrap suitable read/write syntax around
+the underlying "long" type.
+
+These classes also supply a "bits" attribute for use by other code
+built on these classes; for the most part, IPv6 addresses really are
+just IPv4 addresses with more bits, so we supply the number of bits
+once, here, thus avoiding a lot of duplicate code elsewhere.
+"""
+
+import socket, struct
+
+class v4addr(long):
+  """IPv4 address.
+
+  Derived from long, but supports IPv4 print syntax.
+  """
+
+  bits = 32
+  
+  def __new__(cls, x):
+    """Construct a v4addr object."""
+    if isinstance(x, str):
+      x = ".".join(str(int(i)) for i in x.split("."))
+      y = struct.unpack("!I", socket.inet_pton(socket.AF_INET, x))
+      x = y[0]
+    return long.__new__(cls, x)
+
+  def __str__(self):
+    """Convert a v4addr object to string format."""
+    return socket.inet_ntop(socket.AF_INET, struct.pack("!I", long(self)))
+
+class v6addr(long):
+  """IPv6 address.
+
+  Derived from long, but supports IPv6 print syntax.
+  """
+
+  bits = 128
+
+  def __new__(cls, x):
+    """Construct a v6addr object."""
+    if isinstance(x, str):
+      y = struct.unpack("!QQ", socket.inet_pton(socket.AF_INET6, x))
+      x = (y[0] << 64) | y[1]
+    return long.__new__(cls, x)
+
+  def __str__(self):
+    """Convert a v6addr object to string format."""
+    return socket.inet_ntop(socket.AF_INET6,
+                            struct.pack("!QQ", long(self) >> 64, long(self) & 0xFFFFFFFFFFFFFFFF))