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diff --git a/src/lib/dns/rdata/generic/soa_6.cc b/src/lib/dns/rdata/generic/soa_6.cc
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+++ b/src/lib/dns/rdata/generic/soa_6.cc
@@ -0,0 +1,210 @@
+// Copyright (C) 2010-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+
+#include <util/buffer.h>
+#include <dns/name.h>
+#include <dns/master_lexer.h>
+#include <dns/master_loader.h>
+#include <dns/master_loader_callbacks.h>
+#include <dns/messagerenderer.h>
+#include <dns/rdata.h>
+#include <dns/rdataclass.h>
+
+#include <dns/rdata/generic/detail/lexer_util.h>
+
+#include <boost/static_assert.hpp>
+#include <boost/lexical_cast.hpp>
+
+#include <string>
+#include <sstream>
+
+using namespace std;
+using boost::lexical_cast;
+using namespace isc::util;
+using isc::dns::rdata::generic::detail::createNameFromLexer;
+
+// BEGIN_ISC_NAMESPACE
+// BEGIN_RDATA_NAMESPACE
+
+SOA::SOA(InputBuffer& buffer, size_t) :
+    mname_(buffer), rname_(buffer)
+{
+    // we don't need rdata_len for parsing.  if necessary, the caller will
+    // check consistency.
+    buffer.readData(numdata_, sizeof(numdata_));
+}
+
+namespace {
+void
+fillParameters(MasterLexer& lexer, uint8_t numdata[20]) {
+    // Copy serial, refresh, retry, expire, minimum.  We accept the extended
+    // TTL-compatible style for the latter four.
+    OutputBuffer buffer(20);
+    buffer.writeUint32(lexer.getNextToken(MasterToken::NUMBER).getNumber());
+    for (int i = 0; i < 4; ++i) {
+        buffer.writeUint32(RRTTL(lexer.getNextToken(MasterToken::STRING).
+                                 getString()).getValue());
+    }
+    memcpy(numdata,  buffer.getData(), buffer.getLength());
+}
+}
+
+/// \brief Constructor from string.
+///
+/// The given string must represent a valid SOA RDATA.  There can be extra
+/// space characters at the beginning or end of the text (which are simply
+/// ignored), but other extra text, including a new line, will make the
+/// construction fail with an exception.
+///
+/// The MNAME and RNAME must be absolute since there's no parameter that
+/// specifies the origin name; if these are not absolute, \c MissingNameOrigin
+/// exception will be thrown.  These must not be represented as a quoted
+/// string.
+///
+/// See the construction that takes \c MasterLexer for other fields.
+///
+/// \throw Others Exception from the Name and RRTTL constructors.
+/// \throw InvalidRdataText Other general syntax errors.
+SOA::SOA(const std::string& soastr) :
+    // Fill in dummy name and replace them soon below.
+    mname_(Name::ROOT_NAME()), rname_(Name::ROOT_NAME())
+{
+    try {
+        std::istringstream ss(soastr);
+        MasterLexer lexer;
+        lexer.pushSource(ss);
+
+        mname_ = createNameFromLexer(lexer, NULL);
+        rname_ = createNameFromLexer(lexer, NULL);
+        fillParameters(lexer, numdata_);
+
+        if (lexer.getNextToken().getType() != MasterToken::END_OF_FILE) {
+            isc_throw(InvalidRdataText, "extra input text for SOA: "
+                      << soastr);
+        }
+    } catch (const MasterLexer::LexerError& ex) {
+        isc_throw(InvalidRdataText, "Failed to construct SOA from '" <<
+                  soastr << "': " << ex.what());
+    }
+}
+
+/// \brief Constructor with a context of MasterLexer.
+///
+/// The \c lexer should point to the beginning of valid textual representation
+/// of an SOA RDATA.  The MNAME and RNAME fields can be non absolute if
+/// \c origin is non NULL, in which case \c origin is used to make them
+/// absolute.  These must not be represented as a quoted string.
+///
+/// The REFRESH, RETRY, EXPIRE, and MINIMUM fields can be either a valid
+/// decimal representation of an unsigned 32-bit integer or other
+/// valid textual representation of \c RRTTL such as "1H" (which means 3600).
+///
+/// \throw MasterLexer::LexerError General parsing error such as missing field.
+/// \throw Other Exceptions from the Name and RRTTL constructors if
+/// construction of textual fields as these objects fail.
+///
+/// \param lexer A \c MasterLexer object parsing a master file for the
+/// RDATA to be created
+/// \param origin If non NULL, specifies the origin of MNAME and RNAME when
+/// they are non absolute.
+SOA::SOA(MasterLexer& lexer, const Name* origin,
+         MasterLoader::Options, MasterLoaderCallbacks&) :
+    mname_(createNameFromLexer(lexer, origin)),
+    rname_(createNameFromLexer(lexer, origin))
+{
+    fillParameters(lexer, numdata_);
+}
+
+SOA::SOA(const Name& mname, const Name& rname, uint32_t serial,
+         uint32_t refresh, uint32_t retry, uint32_t expire, uint32_t minimum) :
+    mname_(mname), rname_(rname)
+{
+    OutputBuffer b(20);
+    b.writeUint32(serial);
+    b.writeUint32(refresh);
+    b.writeUint32(retry);
+    b.writeUint32(expire);
+    b.writeUint32(minimum);
+    assert(b.getLength() == sizeof(numdata_));
+    memcpy(numdata_, b.getData(), sizeof(numdata_));
+}
+
+SOA::SOA(const SOA& other) :
+    Rdata(), mname_(other.mname_), rname_(other.rname_)
+{
+    memcpy(numdata_, other.numdata_, sizeof(numdata_));
+}
+
+void
+SOA::toWire(OutputBuffer& buffer) const {
+    mname_.toWire(buffer);
+    rname_.toWire(buffer);
+    buffer.writeData(numdata_, sizeof(numdata_));
+}
+
+void
+SOA::toWire(AbstractMessageRenderer& renderer) const {
+    renderer.writeName(mname_);
+    renderer.writeName(rname_);
+    renderer.writeData(numdata_, sizeof(numdata_));
+}
+
+Serial
+SOA::getSerial() const {
+    InputBuffer b(numdata_, sizeof(numdata_));
+    return (Serial(b.readUint32()));
+}
+
+uint32_t
+SOA::getMinimum() const {
+    // Make sure the buffer access is safe.
+    BOOST_STATIC_ASSERT(sizeof(numdata_) ==
+                        sizeof(uint32_t) * 4 + sizeof(uint32_t));
+
+    InputBuffer b(&numdata_[sizeof(uint32_t) * 4], sizeof(uint32_t));
+    return (b.readUint32());
+}
+
+string
+SOA::toText() const {
+    InputBuffer b(numdata_, sizeof(numdata_));
+    uint32_t serial = b.readUint32();
+    uint32_t refresh = b.readUint32();
+    uint32_t retry = b.readUint32();
+    uint32_t expire = b.readUint32();
+    uint32_t minimum = b.readUint32();
+
+    return (mname_.toText() + " " + rname_.toText() + " " +
+            lexical_cast<string>(serial) + " " +
+            lexical_cast<string>(refresh) + " " +
+            lexical_cast<string>(retry) + " " +
+            lexical_cast<string>(expire) + " " +
+            lexical_cast<string>(minimum));
+}
+
+int
+SOA::compare(const Rdata& other) const {
+    const SOA& other_soa = dynamic_cast<const SOA&>(other);
+
+    int order = compareNames(mname_, other_soa.mname_);
+    if (order != 0) {
+        return (order);
+    }
+
+    order = compareNames(rname_, other_soa.rname_);
+    if (order != 0) {
+        return (order);
+    }
+
+    return (memcmp(numdata_, other_soa.numdata_, sizeof(numdata_)));
+}
+
+// END_RDATA_NAMESPACE
+// END_ISC_NAMESPACE