Using the timestamp / nodeid version (version 1), where the nodeid comes from network equipment (Like a UUID generated using the uuidgen -t command.)
version 1 time-based 2 DCE Security , with embedded POSIX UIDs. 3 name-based uses MD5 hashing. 4 randomly or pseudo-randomly generated 5 name-based uses SHA-1 hashing.
UUID = | time_low 4 | -
time_mid | 2 -
| version + time_high | 2 -
| clock_seq + reserved + clock_seq_low | 2 -
| node | 6 or | by hexDigits llllllll | - | mmmm | - | vhhh | - | rcll | - | nnnnnnnnnnnn
| |
see RFC4122 section 4.3 for generation of Name Based UUIDs, Section 4.4 for using random numbers.8 Octets (Bytes) total time_low 4 hexOctets 6A3C6342 time_mid 2 hexOctets D97C version_and_time_high 2 hexOctets v hexDigit 1 hhh hexDigit+hexOctet 1DBThe timestamp is a 60-bit value.
For UUID version 1, this is represented by Coordinated Universal Time (UTC)
as a count of 100-nanosecond intervals since 00:00:00.00, 15 October 1582
(The date of Gregorian reform to the Christian calendar).clock_seq_high + reserved 1 hexOctet reserved 3 bits ! (aka variant aka type ) 0-7 NCS ; backward compatibility 8-B current variant of UUID; 8 C-D Microsoft E-F furture clock_seq_high bit + hexDigit 3 clock_seq_low hexOctet 14 node 6 hexOctet 0800200C9A66 hexOctet (aka byte) = hexDigit hexDigit hexDigit = 0 : F
- v - - time-based
6A3C6342-D97C-11DB-8314-0800200C9A66
generated on:
Friday, March 23, 2007 8:23:51 PM GMT
- v - - name-based using MD5 hashing
878D2A6D-CF75-3C00-A1A2-C69C89F494FE
(My MacBook Pro uses this 12/06/12)
- v - - random
1CBE3804-20DF-48DA-B048-895C206E80A5
- v - - name based using SHA-1 hashing
9205DB27-ADBE-5C67-B58F-AE743BF777D9
Generate your own version:1 (time based) UUID at Famkruithof.net/uuid/uuidgen
Extract the time from a version 1 UUID
In Addition generate UUIDs and display them as OIDs at itu.int/ITU-T/asn1/uuid.html
For example UUIDe36abc20-dbfd-11e5-ba7e-0002a5d5c51b
OID 2.25.302288954206570441749496791616059720987
The OID
repository is at OID-INFO.COM
OID
for The OZ DOD OSI Network in various notations:
Obtaining a PrivateEnterpriseNumber from IANA
The Bluetooth SIG maintains a list of "Assigned Numbers" that includes those UUIDs found in the sample app: bluetooth.org/en-us/specification/assigned-numbers
UUIDs are 128 bits in length, the assigned numbers for Bluetooth LE are listed as 16 bit hex values the lower 96 bits are consistent across a class of attributes.
For example, all BLE characteristic UUIDs are of the form:
16-bit UUID Assigned NumbersSome Examples
--- Winsock Layered Service Provider list ---
MSAFD Tcpip [TCP/IP]
GUID: {E70F1AA0-AB8B-11CF-8CA3-00805F48A192}
%SystemRoot%\system32\mswsock.dll
NT/2k/XP IP protocol
DB %SystemRoot%\system32\mswsock.dll DB protocol: MSAFD Tcpip[*]
MSAFD Tcpip [RAW/IP]
RSVP UDP Service Provider
GUID: {9D60A9E0-337A-11D0-BD88-0000C082E69A}
%SystemRoot%\system32\rsvpsp.dll
NT/2k/XP RVSP
DB %SystemRoot%\system32\rsvpsp.dll DB protocol: RSVP * Service Provider
RSVP TCP Service Provider
MSAFD nwlnkipx [IPX]
GUID: {11058240-BE47-11CF-95C8-00805F48A192}
%SystemRoot%\system32\mswsock.dll
NT/2k/XP Novell Netware UPX protocol
DB %SystemRoot%\system32\mswsock.dll DB protocol: MSAFD nwlnkipx *
MSAFD nwlnkspx [SPX]
GUID: {11058241-
MSAFD nwlnkspx [SPX] [Pseudo Stream]
MSAFD nwlnkspx [SPX II]
MSAFD nwlnkspx [SPX II] [Pseudo Stream]
MSAFD NetBIOS [\Device\NwlnkNb] SEQPACKET 3
GUID: {8D5F1830-C273-11CF-95C8-00805F48A192}
%SystemRoot%\system32\mswsock.dll
NT/2k/XP NetBios protocol
DB %SystemRoot%\system32\mswsock.dll DB protocol: MSAFD NetBIOS *
MSAFD NetBIOS [\Device\NwlnkNb] DATAGRAM 3
MSAFD NetBIOS [\Device\NetBT_Tcpip_{5E9F90A2-3DAC-477B-AE25-81B8ED1CE696}] SEQPACKET 0
MSAFD NetBIOS [\Device\NetBT_Tcpip_{5E9F90A2-3DAC-477B-AE25-81B8ED1CE696}] DATAGRAM 0
MSAFD NetBIOS [\Device\NetBT_Tcpip_{FBC2E32E-ABD0-4C56-AD81-8F947E1D3172}] SEQPACKET 1
MSAFD NetBIOS [\Device\NetBT_Tcpip_{FBC2E32E-ABD0-4C56-AD81-8F947E1D3172}] DATAGRAM 1
MSAFD NetBIOS [\Device\NetBT_Tcpip_{DC584667-773B-4D03-84F4-C834EEB4612E}] SEQPACKET 2
MSAFD NetBIOS [\Device\NetBT_Tcpip_{DC584667-773B-4D03-84F4-C834EEB4612E}] DATAGRAM 2
Namespace Provider 0: Tcpip
GUID: {22059D40-7E9E-11CF-AE5A-00AA00A7112B}
%SystemRoot%\System32\mswsock.dll
NT/2k/XP TCP/IP name space provider
DB %SystemRoot%\system32\mswsock.dll DB protocol: TCP/IP
Namespace Provider 1: NTDS
GUID: {3B2637EE-E580-11CF-A555-00C04FD8D4AC}
%SystemRoot%\System32\winrnr.dll
NT/2k/XP name space provider
DB %SystemRoot%\system32\winrnr.dll DB protocol: NTDS
Namespace Provider 2: Network Location Awareness (NLA) Namespace
GUID: {6642243A-3BA8-4AA6-BAA5-2E0BD71FDD83}
%SystemRoot%\System32\mswsock.dll
NT/2k/XP name space provider
DB %SystemRoot%\system32\mswsock.dll DB protocol: NLA-Namespace
Namespace Provider 3: NWLink IPX/SPX/NetBIOS Compatible Transport Protocol
GUID: {E02DAAF0-7E9F-11CF-AE5A-00AA00A7112B}
%SystemRoot%\System32\nwprovau.dll
NT/2k/XP Novell Netware name space provider
DB %SystemRoot%\system32\nwprovau.dll DB protocol: NWLink IPX/SPX/NetBIOS*
8D5F1830-C273-11CF
was generated on: Mon, 10 Jun 1996 03:52:56 +0000 0000XXXX-0000-1000-8000-00805f9b34fb
The assigned number for the Heart Rate Measurement characteristic UUID is listed as 0x2A37, which is how the developer of the sample code could arrive at:
00002a37-0000-1000-8000-00805f9b34fb
BD_ADDR values assigned by the IEEE.
65013 0xFDF5 Milwaukee Electric Tools 11-Jan-2018
65014 0xFDF6 AIAIAI ApS 11-Jan-2018
&hellips;
65273 0xFEF9 PayPal, Inc. 13-Jan-2014
65274 0xFEFA PayPal, Inc. 13-Jan-2014
65275 0xFEFB Telit Wireless Solutions (Formerly Stollmann E+V GmbH) 06-Jan-2014
65276 0xFEFC Gimbal, Inc. 20-Dec-2013
65277 0xFEFD Gimbal, Inc. 20-Dec-2013
65278 0xFEFE GN ReSound A/S 17-Dec-2013
65279 0xFEFF GN Netcom 12-Dec-2013
https://bluetooth.service-now.com/ess/knowledge_membership.do
Real-World-Systems Adopter
CASE0040026
How do I change my username?
by Bluetooth Support
Log on to www.bluetooth.comGo to My BlueClick on "My Settings" (https://apps.bluetooth.com/MySettings#/) Under tab "My Information," click "Edit" Change your username (it may take up to 10 minutes for the change to take affect)Click “Save Changes” ...
Real-World-Systems, Inc.
is currently a Bluetooth SIG member in good standing