1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
Network Working Group M. Mealling
Request for Comments: 3001 Network Solutions, Inc.
Category: Informational November 2000
A URN Namespace of Object Identifiers
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract
This document describes a Uniform Resource Names (URN) namespace that
contains Object Identifiers (OIDs).
1. Introduction
An Object Identifier is a series of digits delimited in some way.
The rules roughly state that once an entity is assigned an Object
Identifier (OID) it has sole discretion to further subdelegate off of
that OID. Some examples of OIDs include:
o 1.3.6.1 - the Internet OID
o 1.3.6.1.4.1 - IANA-assigned company OIDs, used for private MIBs
and such things
o 1.3.6.1.2.1.27 - The Applications MIB
o 0.9.2342.19200300.100.4 - Object ID's used in the directory pilot
project to identify X.500 Object Classes. Mostly defined in RFC-
1274.
This document specifies the "oid" URN namespace [1]. This namespace
is for encoding an Object Identifier as specified in ASN.1 [2] as a
URI.
The namespace specification is for a formal namespace.
2. Specification Template
Namespace ID:
"oid" requested.
Mealling Informational [Page 1]
^L
RFC 3001 URN Namespace of Object Identifiers November 2000
Registration Information:
Registration Version Number: 1
Registration Date: 2000-04-30
Declared registrant of the namespace:
I need help here. I'm not comfortable being the 'registrant'. So
who do I actually put here?
The ISO/IEC Joint Technical Committee 1 - SubCommittee 6 The
actual real authority is the ASN.1 specification itself but at
present SC6 is the committee that has the authority to interpret
what that means.
Declaration of structure:
The NSS portion of the identifier follows the string encoding
rules found in RFC 1778 Section 2.15 [3] which specifies a series
of digits separated by a period with the most significant digit
being at the left and the least significant being at the right.
No changes are anticipated since Object Identifiers are fairly
simple and have been standardized with no changes for many years.
Relevant ancillary documentation:
Relevant documentation can be found in X.660/Amd 2 | ISO/IEC
9834-1/Amd 2 [2].
Identifier uniqueness considerations:
The rules for assignment of OIDs requires that each OID be unique
to the OID space and that it cannot be reassigned or reused. By
reference this URN namespace inherents those rules.
Identifier persistence considerations:
The rules concerning the use of OIDs requires that they not be
reused once assigned. By reference this URN namespace inherents
those rules.
Process of identifier assignment:
Once an OID is assigned to some entity, that entity can then
create and assign new OIDs below that particular OID. There are
multiple entities that assign new OIDs to the general public. The
top three levels are pre-assigned as follows:
Mealling Informational [Page 2]
^L
RFC 3001 URN Namespace of Object Identifiers November 2000
0 - ITU-T assigned
1 - ISO assigned
2 - Joint ISO/ITU-T assignment
several assigned OIDs that are of importance to the Internet are:
1.3.6.1 - the Internet OID
1.3.6.1.4.1 - IANA-assigned company OIDs, used for private
MIBs and such things
Process of identifier resolution:
At this time no resolution mechanism is defined.
Rules for Lexical Equivalence:
OIDs are composed of multiple occurrences of digits and the "."
character. Lexical equivalence is achieved by exact string match.
Conformance with URN Syntax:
There are no additional characters reserved.
Validation mechanism:
None.
Scope:
Global
3. Examples
The following examples are taken from the example OIDs from the
Introduction:
urn:oid:1.3.6.1
urn:oid:1.3.6.1.4.1
urn:oid:1.3.6.1.2.1.27
URN:OID:0.9.2342.19200300.100.4
4. Security Considerations
None not already inherent to using unverifiable OIDs
Mealling Informational [Page 3]
^L
RFC 3001 URN Namespace of Object Identifiers November 2000
5. Acknowledgements
The author would like to thank Harald Alvestrand for the use of his
OID database as a source for examples and references.
References
[1] Moats, R., "URN Syntax", RFC 2141, May 1997.
[2] CCITT, "Specification of Basic Encoding Rules for Abstract
Syntax Notation One (ASN.1)", CCITT Recommendation X.209,
January 1988.
[3] Howes, T., Kille, S., Yeong, W. and C. Robbins, "The String
Representation of Standard Attribute Syntaxes", RFC 1778, March
1995.
Author's Address
Michael Mealling
Network Solutions, Inc.
505 Huntmar Park Drive
Herndon, VA 22070
US
Phone: +1 770 935 5492
EMail: michaelm@netsol.com
URI: http://www.netsol.com
Mealling Informational [Page 4]
^L
RFC 3001 URN Namespace of Object Identifiers November 2000
Full Copyright Statement
Copyright (C) The Internet Society (2000). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
Mealling Informational [Page 5]
^L
|
