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diff --git a/src/lib/dhcp/option6_iaprefix.h b/src/lib/dhcp/option6_iaprefix.h
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+// Copyright (C) 2013 Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+#ifndef OPTION6_IAPREFIX_H
+#define OPTION6_IAPREFIX_H
+
+#include <asiolink/io_address.h>
+#include <dhcp/option6_iaaddr.h>
+#include <dhcp/option.h>
+
+namespace isc {
+namespace dhcp {
+
+
+/// @brief Class that represents IAPREFIX option in DHCPv6
+///
+/// It is based on a similar class that handles addresses. There are major
+/// differences, though. The fields are in different order. There is also
+/// additional prefix length field.
+///
+/// It should be noted that to get a full prefix (2 values: base prefix, and
+/// a prefix length) 2 methods are used: getAddress() and getLength(). Although
+/// using getAddress() to obtain base prefix is somewhat counter-intuitive at
+/// first, it becomes obvious when one realizes that an address is a special
+/// case of a prefix with /128. It makes everyone's like much easier, because
+/// the base prefix doubles as a regular address in many cases, e.g. when
+/// searching for a lease.
+class Option6IAPrefix : public Option6IAAddr {
+
+public:
+    /// length of the fixed part of the IAPREFIX option
+    static const size_t OPTION6_IAPREFIX_LEN = 25;
+
+    /// @brief Constructor, used for options constructed (during transmission).
+    ///
+    /// @param type option type
+    /// @param addr reference to an address
+    /// @param prefix_length length (1-128)
+    /// @param preferred address preferred lifetime (in seconds)
+    /// @param valid address valid lifetime (in seconds)
+    Option6IAPrefix(uint16_t type, const isc::asiolink::IOAddress& addr,
+                    uint8_t prefix_length, uint32_t preferred, uint32_t valid);
+
+    /// @brief Constructor, used for received options.
+    ///
+    /// @throw OutOfRange if buffer is too short
+    ///
+    /// @param type option type
+    /// @param begin iterator to first byte of option data
+    /// @param end iterator to end of option data (first byte after option end)
+    Option6IAPrefix(uint32_t type, OptionBuffer::const_iterator begin,
+                    OptionBuffer::const_iterator end);
+
+    /// @brief Writes option in wire-format.
+    ///
+    /// Writes option in wire-format to buf, returns pointer to first unused
+    /// byte after stored option.
+    ///
+    /// @throw BadValue if the address is not IPv6
+    ///
+    /// @param buf pointer to a buffer
+    void pack(isc::util::OutputBuffer& buf);
+
+    /// @brief Parses received buffer.
+    ///
+    /// @throw OutOfRange when buffer is shorter than 25 bytes
+    ///
+    /// @param begin iterator to first byte of option data
+    /// @param end iterator to end of option data (first byte after option end)
+    virtual void unpack(OptionBufferConstIter begin,
+                        OptionBufferConstIter end);
+
+    /// Returns string representation of the option.
+    ///
+    /// @param indent number of spaces before printing text
+    ///
+    /// @return string with text representation.
+    virtual std::string toText(int indent = 0);
+
+    /// sets address in this option.
+    ///
+    /// @param prefix prefix to be sent in this option
+    /// @param length prefix length
+    void setPrefix(const isc::asiolink::IOAddress& prefix,
+                   uint8_t length) { addr_ = prefix; prefix_len_ = length; }
+
+    uint8_t getLength() const { return prefix_len_; }
+
+    /// returns data length (data length + DHCPv4/DHCPv6 option header)
+    virtual uint16_t len();
+
+protected:
+    uint8_t prefix_len_;
+};
+
+} // isc::dhcp namespace
+} // isc namespace
+
+#endif // OPTION_IA_H