Add RFC reference.

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    community
    installation
    manual
+   rfc
 
 Indices and tables
 ==================
diff --git a/doc/rfc.rst b/doc/rfc.rst
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+.. _rfc:
+
+DNS RFC Reference
+=================
+
+The DNS is defined by a large number of RFCs, many of which have been
+extensively updated or obsoleted.  This chapter aims to provide a
+roadmap and reference for this confusing space.  The chapter does not
+aim to be encyclopedically complete, however, as the key information
+would then be lost in the noise.  The curious are encouraged to click
+on the "Updated by" links on the IETF pages to see the finer points, or
+the "Obsoletes" links to go spelunking into the history of the DNS.
+
+DNSSEC gets its own section instead of being included in the "Core"
+list because there are many DNSSEC related RFCs and it's helpful to group
+them together.  It's not a statement that DNSSEC isn't part of the "Core"
+of the DNS.
+
+The IANA `DNS Parameters <http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml>`_ registry is the offical reference site for all DNS
+constants.
+
+
+Core RFCs
+---------
+
+`RFC 1034 <https://tools.ietf.org/html/rfc1034>`_
+    Introduction to the DNS and description of basic behavior.
+
+`RFC 1035 <https://tools.ietf.org/html/rfc1035>`_
+    The core DNS wire protocol and master file format.
+
+`RFC 1995 <https://tools.ietf.org/html/rfc1995>`_
+    Incremental zone transfer (IXFR).
+
+`RFC 1996 <https://tools.ietf.org/html/rfc1996>`_
+    The NOTIFY protocol.
+
+`RFC 2181 <https://tools.ietf.org/html/rfc2181>`_
+    Clarifications to the specification.
+
+`RFC 2308 <https://tools.ietf.org/html/rfc2308>`_
+    Negative Caching.
+
+`RFC 2845 <https://tools.ietf.org/html/rfc2845>`_
+    Transaction Sigatures (TSIG)
+
+`RFC 3007 <https://tools.ietf.org/html/rfc3007>`_
+    Dynamic Updates
+
+`RFC 3645 <https://tools.ietf.org/html/rfc3645>`_
+    GSS-TSIG.
+
+    Note that dnspython does not currently have GSS-TSIG support.
+    GSS-TSIG is most frequently used when updating Microsoft
+    Active-Directory-based DNS servers.
+    
+`RFC 5936 <https://tools.ietf.org/html/rfc5936>`_
+    Zone transfers (AXFR).
+
+`RFC 6891 <https://tools.ietf.org/html/rfc6891>`_
+    EDNS (version 0)
+    
+`RFC 8020 <https://tools.ietf.org/html/rfc8020>`_
+    Clarification on the meaning of NXDOMAIN.
+
+DNSSEC RFCs
+-----------
+
+`RFC 4033 <https://tools.ietf.org/html/rfc4033>`_
+    Introduction and requirements.
+
+`RFC 4034 <https://tools.ietf.org/html/rfc4034>`_
+    Resource records.
+
+`RFC 4035 <https://tools.ietf.org/html/rfc4035>`_
+    Protocol.
+
+`RFC 4470 <https://tools.ietf.org/html/rfc4470>`_
+    Minimally covering NSEC records and On-line Signing.
+    
+`RFC 6840 <https://tools.ietf.org/html/rfc6840>`_
+    Clarifications and implementation Notes.
+
+Misc RFCs
+---------
+
+`RFC 1101 <https://tools.ietf.org/html/rfc1101>`_
+    Reverse mapping name form for IPv4.
+
+`RFC 1982 <https://tools.ietf.org/html/rfc1982>`_
+    Serial number arithmetic.
+
+`RFC 4343 <https://tools.ietf.org/html/rfc4343>`_
+    Case-sensitivity clarification.
+
+RFCs for RR types
+-----------------
+
+There are many more RR types than are listed here; if a type is not
+listed it means it is obsolete, deprecated, or rare "in the wild".
+Some newer types that are currently rare are listed because they may
+well be more heavily used in the not-to-distant future.
+See the
+IANA `DNS Parameters <http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml>`_ registry for a complete list.
+
+A
+    `RFC 1035 <https://tools.ietf.org/html/rfc1035>`_
+AAAA
+    `RFC 3596 <https://tools.ietf.org/html/rfc3596>`_
+CDS
+    `RFC 7344 <https://tools.ietf.org/html/rfc7344>`_
+CDNSKEY
+    `RFC 7344 <https://tools.ietf.org/html/rfc7344>`_
+CNAME
+    `RFC 1035 <https://tools.ietf.org/html/rfc1035>`_
+CSYNC
+    `RFC 7477 <https://tools.ietf.org/html/rfc7477>`_
+DNAME
+    `RFC 6672 <https://tools.ietf.org/html/rfc6672>`_
+DNSKEY
+    `RFC 4034 <https://tools.ietf.org/html/rfc4034>`_
+DS
+    `RFC 4034 <https://tools.ietf.org/html/rfc4034>`_
+LOC
+    `RFC 1876 <https://tools.ietf.org/html/rfc1876>`_
+MX
+    `RFC 1035 <https://tools.ietf.org/html/rfc1035>`_
+NAPTR
+    `RFC 3403 <https://tools.ietf.org/html/rfc3403>`_
+NS
+    `RFC 1035 <https://tools.ietf.org/html/rfc1035>`_
+NSEC
+    `RFC 4034 <https://tools.ietf.org/html/rfc4034>`_
+NSEC3
+    `RFC 5155 <https://tools.ietf.org/html/rfc5155>`_
+NSEC3PARAM
+    `RFC 5155 <https://tools.ietf.org/html/rfc5155>`_
+OPENPGPKEY
+    `RFC 7929 <https://tools.ietf.org/html/rfc7929>`_
+PTR
+    `RFC 1035 <https://tools.ietf.org/html/rfc1035>`_
+RRSIG
+    `RFC 4034 <https://tools.ietf.org/html/rfc4034>`_
+SOA
+    `RFC 1035 <https://tools.ietf.org/html/rfc1035>`_
+SPF
+    `RFC 7208 <https://tools.ietf.org/html/rfc7208>`_
+SRV
+    `RFC 2782 <https://tools.ietf.org/html/rfc2782>`_
+TLSA
+    `RFC 6698 <https://tools.ietf.org/html/rfc6698>`_
+TXT
+    `RFC 1035 <https://tools.ietf.org/html/rfc1035>`_