<s>
This	O
list	B-Protocol
of	I-Protocol
DNS	I-Protocol
record	I-Protocol
types	I-Protocol
is	O
an	O
overview	O
of	O
resource	O
records	O
(	O
RRs	O
)	O
permissible	O
in	O
zone	B-Protocol
files	I-Protocol
of	O
the	O
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
(	O
DNS	B-Protocol
)	O
.	O
</s>
<s>
(	O
decimal	O
)	O
Defining	O
RFC	O
Description	O
Function	O
A1RFC	O
1035	O
Address	O
record	O
Returns	O
a	O
32-bit	O
IPv4	B-Protocol
address	O
,	O
most	O
commonly	O
used	O
to	O
map	O
hostnames	B-Protocol
to	O
an	O
IP	O
address	O
of	O
the	O
host	O
,	O
but	O
it	O
is	O
also	O
used	O
for	O
DNSBLs	O
,	O
storing	O
subnet	B-Protocol
masks	I-Protocol
in	O
RFC	O
1101	O
,	O
etc	O
.	O
</s>
<s>
AAAA28RFC	O
3596	O
IPv6	B-Protocol
address	O
record	O
Returns	O
a	O
128-bit	O
IPv6	B-Protocol
address	O
,	O
most	O
commonly	O
used	O
to	O
map	O
hostnames	B-Protocol
to	O
an	O
IP	O
address	O
of	O
the	O
host	O
.	O
</s>
<s>
AFSDB18RFC	O
1183AFS	O
database	O
recordLocation	O
of	O
database	O
servers	O
of	O
an	O
AFS	B-Application
cell	O
.	O
</s>
<s>
This	O
record	O
is	O
commonly	O
used	O
by	O
AFS	B-Application
clients	O
to	O
contact	O
AFS	B-Application
cells	O
outside	O
their	O
local	O
domain	O
.	O
</s>
<s>
A	O
subtype	O
of	O
this	O
record	O
is	O
used	O
by	O
the	O
obsolete	O
DCE/DFS	B-Protocol
file	O
system	O
.	O
</s>
<s>
in	O
CIDR	B-Protocol
format	O
,	O
for	O
various	O
address	O
families	O
.	O
</s>
<s>
CAA257Certification	O
Authority	O
AuthorizationDNS	O
Certification	B-Protocol
Authority	I-Protocol
Authorization	I-Protocol
,	O
constraining	O
acceptable	O
CAs	O
for	O
a	O
host/domain	O
CDNSKEY60RFC	O
7344Child	O
copy	O
of	O
DNSKEY	O
record	O
,	O
for	O
transfer	O
to	O
parent	O
CDS59RFC	O
7344Child	O
DSChild	O
copy	O
of	O
DS	O
record	O
,	O
for	O
transfer	O
to	O
parent	O
CERT	O
37RFC	O
4398Certificate	O
recordStores	O
PKIX	O
,	O
SPKI	O
,	O
PGP	B-Application
,	O
etc	O
.	O
</s>
<s>
CNAME5RFC	O
1035	O
Canonical	B-Protocol
name	I-Protocol
record	I-Protocol
Alias	O
of	O
one	O
name	O
to	O
another	O
:	O
the	O
DNS	B-Protocol
lookup	I-Protocol
will	O
continue	O
by	O
retrying	O
the	O
lookup	O
with	O
the	O
new	O
name	O
.	O
</s>
<s>
CSYNC62RFC	O
7477Child-to-Parent	O
SynchronizationSpecify	O
a	O
synchronization	O
mechanism	O
between	O
a	O
child	O
and	O
a	O
parent	O
DNS	B-Protocol
zone	I-Protocol
.	O
</s>
<s>
Typical	O
example	O
is	O
declaring	O
the	O
same	O
NS	O
records	O
in	O
the	O
parent	O
and	O
the	O
child	O
zoneDHCID	O
49RFC	O
4701DHCP	O
identifierUsed	O
in	O
conjunction	O
with	O
the	O
FQDN	O
option	O
to	O
DHCPDLV32769RFC	O
4431DNSSEC	O
Lookaside	O
Validation	O
recordFor	O
publishing	O
DNSSEC	B-Protocol
trust	O
anchors	O
outside	O
of	O
the	O
DNS	B-Protocol
delegation	O
chain	O
.	O
</s>
<s>
RFC	O
5074	O
describes	O
a	O
way	O
of	O
using	O
these	O
records.DNAME39RFC	O
6672	O
Delegation	O
name	O
record	O
Alias	O
for	O
a	O
name	O
and	O
all	O
its	O
subnames	O
,	O
unlike	O
CNAME	B-Protocol
,	O
which	O
is	O
an	O
alias	O
for	O
only	O
the	O
exact	O
name	O
.	O
</s>
<s>
Like	O
a	O
CNAME	B-Protocol
record	I-Protocol
,	O
the	O
DNS	B-Protocol
lookup	I-Protocol
will	O
continue	O
by	O
retrying	O
the	O
lookup	O
with	O
the	O
new	O
name.DNSKEY48RFC	O
4034DNS	O
Key	O
recordThe	O
key	O
record	O
used	O
in	O
DNSSEC	B-Protocol
.	O
</s>
<s>
Uses	O
the	O
same	O
format	O
as	O
the	O
KEY	O
record.DS43RFC	O
4034Delegation	O
signerThe	O
record	O
used	O
to	O
identify	O
the	O
DNSSEC	B-Protocol
signing	O
key	O
of	O
a	O
delegated	O
zoneEUI48108RFC	O
7043MAC	O
address	O
(	O
EUI-48	O
)	O
A	O
48-bit	O
IEEE	O
Extended	O
Unique	O
Identifier.EUI64109RFC	O
7043MAC	O
address	O
(	O
EUI-64	O
)	O
A	O
64-bit	O
IEEE	O
Extended	O
Unique	O
Identifier.HINFO13RFC	O
8482Host	O
InformationProviding	O
Minimal-Sized	O
Responses	O
to	O
DNS	B-Protocol
Queries	I-Protocol
That	O
Have	O
QTYPE	O
=	O
ANYHIP55RFC	O
8005Host	O
Identity	O
ProtocolMethod	O
of	O
separating	O
the	O
end-point	O
identifier	O
and	O
locator	O
roles	O
of	O
IP	O
addresses.HTTPS65IETF	O
DraftHTTPS	O
BindingRR	O
that	O
improves	O
performance	O
for	O
clients	O
that	O
need	O
to	O
resolve	O
many	O
resources	O
to	O
access	O
a	O
domain	O
.	O
</s>
<s>
"	O
The	O
KEY	O
RR	O
was	O
defined	O
in	O
RFC	O
2930	O
...	O
"	O
Key	O
recordUsed	O
only	O
for	O
SIG(0 )	O
(	O
RFC	O
2931	O
)	O
and	O
TKEY	B-Protocol
(	O
RFC	O
2930	O
)	O
.RFC	O
2931	O
,	O
§	O
2.4	O
.	O
</s>
<s>
"	O
SIG(0 )	O
on	O
the	O
other	O
hand	O
,	O
uses	O
public	O
key	O
authentication	O
,	O
where	O
the	O
public	O
keys	O
are	O
stored	O
in	O
DNS	B-Protocol
as	O
KEY	O
RRs	O
and	O
a	O
private	O
key	O
is	O
stored	O
at	O
the	O
signer.	O
"	O
</s>
<s>
RFC	O
3445	O
eliminated	O
their	O
use	O
for	O
application	O
keys	O
and	O
limited	O
their	O
use	O
to	O
DNSSEC.RFC	O
3445	O
,	O
§1	O
.	O
</s>
<s>
"	O
DNSSEC	B-Protocol
will	O
be	O
the	O
only	O
allowable	O
sub-type	O
for	O
the	O
KEY	O
RR	O
...	O
"	O
RFC	O
3755	O
designates	O
DNSKEY	O
as	O
the	O
replacement	O
within	O
DNSSEC.RFC	O
3755	O
,	O
§3	O
.	O
</s>
<s>
RRSIG	B-Protocol
(	O
Resource	O
Record	O
SIGnature	O
)	O
will	O
replace	O
SIG	O
,	O
and	O
NSEC	O
(	O
Next	O
SECure	O
)	O
will	O
replace	O
NXT	O
.	O
</s>
<s>
These	O
new	O
types	O
completely	O
replace	O
the	O
old	O
types	O
,	O
except	O
that	O
SIG(0 )	O
RFC2931	O
and	O
TKEY	B-Protocol
RFC2930	O
will	O
continue	O
to	O
use	O
SIG	O
and	O
KEY.	O
"	O
</s>
<s>
RFC	O
4025	O
designates	O
IPSECKEY	O
as	O
the	O
replacement	O
for	O
use	O
with	O
IPsec.RFC	O
4025	O
,	O
Abstract	O
.	O
</s>
<s>
"	O
KX36RFC	O
2230	O
Key	O
Exchanger	O
record	O
Used	O
with	O
some	O
cryptographic	O
systems	O
(	O
not	O
including	O
DNSSEC	B-Protocol
)	O
to	O
identify	O
a	O
key	O
management	O
agent	O
for	O
the	O
associated	O
domain-name	O
.	O
</s>
<s>
Note	O
that	O
this	O
has	O
nothing	O
to	O
do	O
with	O
DNS	B-Protocol
Security	O
.	O
</s>
<s>
LOC29RFC	O
1876	O
Location	O
record	O
Specifies	O
a	O
geographical	O
location	O
associated	O
with	O
a	O
domain	O
name	O
MX15RFC	O
1035	O
and	O
RFC	O
7505	O
Mail	O
exchange	O
record	O
List	O
of	O
mail	O
exchange	O
servers	O
that	O
accept	O
email	O
for	O
a	O
domain	O
NAPTR35RFC	O
3403	O
Naming	O
Authority	O
Pointer	O
Allows	O
regular-expression-based	O
rewriting	O
of	O
domain	O
names	O
which	O
can	O
then	O
be	O
used	O
as	O
URIs	B-Protocol
,	O
further	O
domain	O
names	O
to	O
lookups	O
,	O
etc	O
.	O
</s>
<s>
NS2RFC	O
1035	O
Name	O
server	O
record	O
Delegates	O
a	O
DNS	B-Protocol
zone	I-Protocol
to	O
use	O
the	O
given	O
authoritative	O
name	O
serversNSEC47RFC	O
4034Next	O
Secure	O
recordPart	O
of	O
DNSSEC	B-Protocol
—	O
used	O
to	O
prove	O
a	O
name	O
does	O
not	O
exist	O
.	O
</s>
<s>
Uses	O
the	O
same	O
format	O
as	O
the	O
(	O
obsolete	O
)	O
NXT	O
record.NSEC350RFC	O
5155Next	O
Secure	O
record	O
version	O
3An	O
extension	O
to	O
DNSSEC	B-Protocol
that	O
allows	O
proof	O
of	O
nonexistence	O
for	O
a	O
name	O
without	O
permitting	O
zonewalkingNSEC3PARAM51RFC	O
5155NSEC3	O
parametersParameter	O
record	O
for	O
use	O
with	O
NSEC3OPENPGPKEY61RFC	O
7929OpenPGP	O
public	O
key	O
recordA	O
DNS-based	B-Protocol
Authentication	I-Protocol
of	I-Protocol
Named	I-Protocol
Entities	I-Protocol
(	O
DANE	B-Protocol
)	O
method	O
for	O
publishing	O
and	O
locating	O
OpenPGP	O
public	O
keys	O
in	O
DNS	B-Protocol
for	O
a	O
specific	O
email	O
address	O
using	O
an	O
OPENPGPKEY	O
DNS	B-Protocol
resource	O
record	O
.	O
</s>
<s>
Unlike	O
a	O
CNAME	B-Protocol
,	O
DNS	B-Protocol
processing	O
stops	O
and	O
just	O
the	O
name	O
is	O
returned	O
.	O
</s>
<s>
The	O
most	O
common	O
use	O
is	O
for	O
implementing	O
reverse	B-Protocol
DNS	I-Protocol
lookups	I-Protocol
,	O
but	O
other	O
uses	O
include	O
such	O
things	O
as	O
DNS-SD.RRSIG46RFC	O
4034DNSSEC	O
signatureSignature	O
for	O
a	O
DNSSEC-secured	O
record	O
set	O
.	O
</s>
<s>
Usually	O
an	O
email	O
address	O
with	O
the	O
@	O
replaced	O
by	O
a	O
.SIG24RFC	O
2535SignatureSignature	O
record	O
used	O
in	O
SIG(0 )	O
(	O
RFC	O
2931	O
)	O
and	O
TKEY	B-Protocol
(	O
RFC	O
2930	O
)	O
.	O
</s>
<s>
RFC	O
3755	O
designated	O
RRSIG	B-Protocol
as	O
the	O
replacement	O
for	O
SIG	O
for	O
use	O
within	O
DNSSEC	B-Protocol
.	O
</s>
<s>
SOA	B-Protocol
6	O
RFC	O
1035	O
and	O
RFC	O
2308The	O
minimum	O
field	O
of	O
SOA	B-Protocol
record	I-Protocol
is	O
redefined	O
to	O
be	O
the	O
TTL	O
of	O
NXDOMAIN	O
reply	O
in	O
RFC	O
2308	O
.	O
</s>
<s>
Start	O
of	O
[	O
a	O
zone	O
of ]	O
authority	O
record	O
Specifies	O
authoritative	O
information	O
about	O
a	O
DNS	B-Protocol
zone	I-Protocol
,	O
including	O
the	O
primary	O
name	O
server	O
,	O
the	O
email	O
of	O
the	O
domain	O
administrator	O
,	O
the	O
domain	O
serial	O
number	O
,	O
and	O
several	O
timers	O
relating	O
to	O
refreshing	O
the	O
zone	O
.	O
</s>
<s>
SRV33RFC	O
2782Service	O
locatorGeneralized	O
service	O
location	O
record	O
,	O
used	O
for	O
newer	O
protocols	O
instead	O
of	O
creating	O
protocol-specific	O
records	O
such	O
as	O
MX	B-Protocol
.	O
</s>
<s>
SSHFP44RFC	O
4255SSH	O
Public	O
Key	O
FingerprintResource	O
record	O
for	O
publishing	O
SSH	B-Protocol
public	O
host	O
key	O
fingerprints	O
in	O
the	O
DNS	B-Protocol
,	O
in	O
order	O
to	O
aid	O
in	O
verifying	O
the	O
authenticity	O
of	O
the	O
host	O
.	O
</s>
<s>
RFC	O
6594	O
defines	O
ECC	O
SSH	B-Protocol
keys	I-Protocol
and	O
SHA-256	O
hashes	B-Algorithm
.	O
</s>
<s>
See	O
the	O
IANA	O
SSHFP	B-Protocol
RR	O
parameters	O
registry	O
for	O
details.SVCB64IETF	O
DraftService	O
BindingRR	O
that	O
improves	O
performance	O
for	O
clients	O
that	O
need	O
to	O
resolve	O
many	O
resources	O
to	O
access	O
a	O
domain	O
.	O
</s>
<s>
More	O
info	O
in	O
this	O
IETF	O
Draft	O
by	O
DNSOP	O
Working	O
group	O
and	O
Akamai	O
technologies.TA32768DNSSEC	O
Trust	O
AuthoritiesPart	O
of	O
a	O
deployment	O
proposal	O
for	O
DNSSEC	B-Protocol
without	O
a	O
signed	O
DNS	B-Protocol
root	O
.	O
</s>
<s>
Uses	O
the	O
same	O
format	O
as	O
the	O
DS	O
record.TKEY249RFC	O
2930Transaction	O
Key	O
recordA	O
method	O
of	O
providing	O
keying	O
material	O
to	O
be	O
used	O
with	O
TSIG	B-Protocol
that	O
is	O
encrypted	O
under	O
the	O
public	O
key	O
in	O
an	O
accompanying	O
KEY	O
RR.RFC	O
2930	O
,	O
§6	O
.	O
</s>
<s>
"	O
...	O
the	O
keying	O
material	O
is	O
sent	O
within	O
the	O
key	O
data	O
field	O
of	O
a	O
TKEY	B-Protocol
RR	O
encrypted	O
under	O
the	O
public	O
key	O
in	O
an	O
accompanying	O
KEY	O
RR	O
RFC	O
2535	O
.	O
</s>
<s>
"	O
TLSA52RFC	O
6698TLSA	O
certificate	O
associationA	O
record	O
for	O
DANE	B-Protocol
.	O
</s>
<s>
RFC	O
6698	O
defines	O
"	O
The	O
TLSA	B-Protocol
DNS	B-Protocol
resource	O
record	O
is	O
used	O
to	O
associate	O
a	O
TLS	O
server	O
certificate	O
or	O
public	O
key	O
with	O
the	O
domain	O
name	O
where	O
the	O
record	O
is	O
found	O
,	O
thus	O
forming	O
a	O
'	O
TLSA	B-Protocol
certificate	O
association	O
 '	O
"	O
.TSIG250RFC	O
2845Transaction	O
SignatureCan	O
be	O
used	O
to	O
authenticate	O
dynamic	B-Protocol
updates	I-Protocol
as	O
coming	O
from	O
an	O
approved	O
client	O
,	O
or	O
to	O
authenticate	O
responses	O
as	O
coming	O
from	O
an	O
approved	O
recursive	O
name	O
serverRFC	O
2845	O
,	O
abstract	O
similar	O
to	O
DNSSEC.TXT16RFC	O
1035Text	O
recordOriginally	O
for	O
arbitrary	O
human-readable	O
text	O
in	O
a	O
DNS	B-Protocol
record	O
.	O
</s>
<s>
Since	O
the	O
early	O
1990s	O
,	O
however	O
,	O
this	O
record	O
more	O
often	O
carries	O
machine-readable	B-General_Concept
data	I-General_Concept
,	O
such	O
as	O
specified	O
by	O
RFC	O
1464	O
,	O
opportunistic	B-Protocol
encryption	I-Protocol
,	O
Sender	B-Protocol
Policy	I-Protocol
Framework	I-Protocol
,	O
DKIM	B-Protocol
,	O
DMARC	O
,	O
DNS-SD	O
,	O
etc.URI256RFC	O
7553Uniform	O
Resource	O
IdentifierCan	O
be	O
used	O
for	O
publishing	O
mappings	O
from	O
hostnames	B-Protocol
to	O
URIs.ZONEMD63RFC	O
8976Message	O
Digests	O
for	O
DNS	B-Protocol
ZonesProvides	O
a	O
cryptographic	B-Algorithm
message	I-Algorithm
digest	I-Algorithm
over	O
DNS	B-Protocol
zone	I-Protocol
data	O
at	O
rest	O
.	O
</s>
<s>
For	O
example	O
,	O
if	O
there	O
is	O
both	O
an	O
A	O
and	O
an	O
MX	B-Protocol
for	O
a	O
name	O
,	O
but	O
the	O
name	O
server	O
has	O
only	O
the	O
A	O
record	O
cached	O
,	O
only	O
the	O
A	O
record	O
will	O
be	O
returned	O
.	O
</s>
<s>
Usually	O
referred	O
to	O
as	O
ANY	O
(	O
e.g.	O
,	O
in	O
dig	B-Protocol
,	O
Windows	O
nslookup	B-Protocol
,	O
and	O
Wireshark	B-Language
)	O
.	O
</s>
<s>
In	O
2019	O
,	O
RFC8482	O
standards-track	O
publication	O
led	O
many	O
DNS	B-Protocol
providers	O
,	O
including	O
Cloudflare	B-Application
,	O
to	O
provide	O
only	O
minimal	O
responses	O
to	O
"	O
ANY	O
"	O
queries	O
,	O
instead	O
of	O
enumerating	O
records.AXFR252RFC	O
1035	O
Authoritative	O
Zone	O
TransferTransfer	O
entire	O
zone	B-Protocol
file	I-Protocol
from	O
the	O
primary	O
name	O
server	O
to	O
secondary	O
name	O
servers	O
.	O
</s>
<s>
IXFR251RFC	O
1996	O
Incremental	O
Zone	B-Protocol
Transfer	I-Protocol
Requests	O
a	O
zone	B-Protocol
transfer	I-Protocol
of	O
the	O
given	O
zone	O
but	O
only	O
differences	O
from	O
a	O
previous	O
serial	O
number	O
.	O
</s>
<s>
This	O
request	O
may	O
be	O
ignored	O
and	O
a	O
full	O
(	O
AXFR	B-Protocol
)	O
sent	O
in	O
response	O
if	O
the	O
authoritative	O
server	O
is	O
unable	O
to	O
fulfill	O
the	O
request	O
due	O
to	O
configuration	O
or	O
lack	O
of	O
required	O
deltas	O
.	O
</s>
<s>
OPT41RFC	O
6891OptionThis	O
is	O
a	O
pseudo-record	O
type	O
needed	O
to	O
support	O
EDNS	B-Protocol
.	O
</s>
<s>
RFC	O
973	O
replaced	O
these	O
records	O
with	O
the	O
MX	B-Protocol
record	I-Protocol
.	O
</s>
<s>
The	O
intent	O
was	O
for	O
MB	O
and	O
MG	O
to	O
replace	O
the	O
SMTP	B-Protocol
VRFY	O
and	O
EXPN	O
commands	O
.	O
</s>
<s>
MR	O
was	O
to	O
replace	O
the	O
"	O
551	O
User	O
Not	O
Local	O
"	O
SMTP	B-Protocol
error	O
.	O
</s>
<s>
SMTP	B-Protocol
is	O
even	O
prohibited	O
from	O
using	O
WKS	O
records	O
in	O
MX	B-Protocol
processing.RFC	O
1123	O
sections	O
2.2	O
,	O
5.2.12	O
,	O
6.1.3.6	O
NB	O
32	O
RFC	O
1002	O
Mistakes	O
(	O
from	O
RFC	O
1002	O
)	O
;	O
the	O
numbers	O
are	O
now	O
assigned	O
to	O
NIMLOC	O
and	O
SRV	B-Protocol
.	O
</s>
<s>
A6	O
38	O
RFC	O
2874	O
RFC	O
6563	O
Defined	O
as	O
part	O
of	O
early	O
IPv6	B-Protocol
but	O
downgraded	O
to	O
experimental	O
by	O
RFC	O
3363	O
;	O
later	O
downgraded	O
to	O
historic	O
by	O
RFC	O
6563	O
.	O
</s>
<s>
NXT	O
30	O
RFC	O
2065	O
RFC	O
3755	O
Part	O
of	O
the	O
first	O
version	O
of	O
DNSSEC	B-Protocol
(	O
RFC	O
2065	O
)	O
.	O
</s>
<s>
NXT	O
was	O
obsoleted	O
by	O
DNSSEC	B-Protocol
updates	O
(	O
RFC	O
3755	O
)	O
.	O
</s>
<s>
At	O
the	O
same	O
time	O
,	O
the	O
domain	O
of	O
applicability	O
for	O
KEY	O
and	O
SIG	O
was	O
also	O
limited	O
to	O
not	O
include	O
DNSSEC	B-Protocol
use	O
.	O
</s>
<s>
Currently	O
used	O
by	O
Cloudflare	B-Application
in	O
response	O
to	O
queries	O
of	O
the	O
type	O
ANY	O
.	O
</s>
<s>
RP	O
17	O
RFC	O
1183	O
RP	O
may	O
be	O
used	O
for	O
certain	O
human-readable	O
information	O
regarding	O
a	O
different	O
contact	O
point	O
for	O
a	O
specific	O
host	O
,	O
subnet	B-Protocol
,	O
or	O
other	O
domain	O
level	O
label	O
separate	O
than	O
that	O
used	O
in	O
the	O
SOA	B-Protocol
record	I-Protocol
.	O
</s>
<s>
X25	O
19	O
Not	O
in	O
current	O
use	O
by	O
any	O
notable	O
application	O
ISDN	O
20	O
Not	O
in	O
current	O
use	O
by	O
any	O
notable	O
application	O
RT	O
21	O
Not	O
in	O
current	O
use	O
by	O
any	O
notable	O
application	O
NSAP	O
22	O
RFC	O
1706	O
Not	O
in	O
current	O
use	O
by	O
any	O
notable	O
application	O
NSAP-PTR	O
23	O
Not	O
in	O
current	O
use	O
by	O
any	O
notable	O
application	O
PX	O
26	O
RFC	O
2163	O
Not	O
in	O
current	O
use	O
by	O
any	O
notable	O
application	O
EID	O
31	O
Defined	O
by	O
the	O
Nimrod	O
DNS	B-Protocol
Internet	O
Draft	O
,	O
but	O
never	O
made	O
it	O
to	O
RFC	O
status	O
.	O
</s>
<s>
in	O
CIDR	B-Protocol
format	O
,	O
for	O
various	O
address	O
families	O
.	O
</s>
<s>
SINK	O
40	O
Defined	O
by	O
the	O
Kitchen	O
Sink	O
Internet	O
Draft	O
,	O
but	O
never	O
made	O
it	O
to	O
RFC	O
status	O
GPOS	O
27	O
RFC	O
1712	O
A	O
more	O
limited	O
early	O
version	O
of	O
the	O
LOC	B-Protocol
record	I-Protocol
UINFO	O
100	O
IANA	O
reserved	O
,	O
no	O
RFC	O
documented	O
them	O
and	O
support	O
was	O
removed	O
from	O
BIND	B-Protocol
in	O
the	O
early	O
90s	O
.	O
</s>
<s>
UID	O
101	O
GID	O
102	O
UNSPEC	O
103	O
SPF	O
99	O
RFC	O
4408	O
RFC	O
7208	O
Specified	O
as	O
part	O
of	O
the	O
Sender	B-Protocol
Policy	I-Protocol
Framework	I-Protocol
protocol	O
as	O
an	O
alternative	O
to	O
storing	O
SPF	O
data	O
in	O
TXT	B-Protocol
records	I-Protocol
,	O
using	O
the	O
same	O
format	O
.	O
</s>
<s>
Requested	O
for	O
the	O
IETF	O
draft	O
"	O
The	O
Zone	O
Status	O
(	O
ZS	O
)	O
DNS	B-Protocol
Resource	O
Record	O
"	O
in	O
2008	O
.	O
</s>
<s>
RKEY	O
57	O
Used	O
for	O
encryption	O
of	O
NAPTR	B-Protocol
records	I-Protocol
.	O
</s>
<s>
Requested	O
for	O
the	O
IETF	O
draft	O
"	O
The	O
RKEY	O
DNS	B-Protocol
Resource	O
Record	O
"	O
in	O
2008	O
.	O
</s>
