A UUIDv7 measures time in the Unix Epoch with an accuracy between 1ms and 245ns, depending on how many bits are spent for the timestamp (48-60 bits). The rest of the UUID (62-74 bits) is filled with random data. The timestamp is at the front of the UUID, therefore the UUIDs are monotonically increasing, which is good for using them in database indexes. Since this UUID version does not contain a MAC address, it is also recommended due to the improved privacy.
Here are 15 UUIDs that were created just for you! (Reload the page to get more)
01966063-82a9-76cd-a5a1-07e893a3e312
01966063-82a9-789c-9f39-6365d9b27955
01966063-82a9-79e4-a00f-2290b98377fa
01966063-82a9-7b07-957c-c0df7ad143e5
01966063-82a9-7c25-aeb3-0a9b18e7771c
01966063-82a9-7d40-9602-355aa059421f
01966063-82a9-7e5b-b8f4-e128f82cb8fd
01966063-82a9-7f75-8884-bb68c7e93c18
01966063-82aa-7090-a467-f4c4e61e71e4
01966063-82aa-71af-8083-99c33e5ec3cc
01966063-82aa-72c9-bfbc-bd9f4f309dc9
01966063-82aa-73e4-9270-f092a07b74ff
01966063-82aa-74fe-baaa-00bd2b21e7aa
01966063-82aa-7615-bac4-2ee284e0bb85
01966063-82aa-7730-83db-d49b33ec8e1d
Like UUIDv1, this kind of UUID is made of the MAC address of the generating computer, the time, and a clock sequence. However, the components in UUIDv6 are reordered (time is at the beginning), so that UUIDs are monotonically increasing, which is good for using them in database indexes.
Here are 15 UUIDs that were created just for you! (Reload the page to get more)
1f01fe74-2a16-6784-b704-4cf95d479851
1f01fe74-2a16-693c-b704-4cf95d479851
1f01fe74-2a16-6a2c-b704-4cf95d479851
1f01fe74-2a16-6afe-b704-4cf95d479851
1f01fe74-2a16-6bd0-b704-4cf95d479851
1f01fe74-2a16-6c98-b704-4cf95d479851
1f01fe74-2a16-6d6a-b704-4cf95d479851
1f01fe74-2a16-6e32-b704-4cf95d479851
1f01fe74-2a16-6efa-b704-4cf95d479851
1f01fe74-2a16-6fc2-b704-4cf95d479851
1f01fe74-2a17-613e-b704-4cf95d479851
1f01fe74-2a17-62ce-b704-4cf95d479851
1f01fe74-2a17-6418-b704-4cf95d479851
1f01fe74-2a17-64ea-b704-4cf95d479851
1f01fe74-2a17-65a8-b704-4cf95d479851
A UUIDv4 is made of 122 random bits. No other information is encoded in this kind of UUID.
Here are 15 UUIDs that were created just for you! (Reload the page to get more)
25c6324a-018c-493d-a7ca-0db02e75ee72
ab975976-1d33-4ea4-9a4a-c4aa78a0be83
33f3aacf-9a83-4032-8fa8-819c068f0fec
1abb431c-ee3c-4470-b517-5af87dec39ee
14ac33b7-6226-4fd0-87a1-92c9b4b30f02
68597b6e-18db-4f45-811a-d2ce12595779
b8a52d2d-3ec9-444f-8feb-d2607ca44255
c04bf7da-66ea-4b28-971a-a353acec6567
af69384c-658d-4b51-99da-88dde814f0ab
42a5b300-0988-4744-ace5-8ccbebb47121
77305562-b936-4537-bd97-17c33c5cf479
3d232a1e-dc0d-4d86-b801-bf4f4945a73c
5a956229-28a1-4935-821f-210190513bb8
d63fb61f-de1b-4f44-8d88-f41efe3ee91e
7ead0a18-12b5-4ae8-aa92-41ae2f811416
A UUIDv1 is made of the MAC address of the generating computer, the time, and a clock sequence.
Here are 15 UUIDs that were created just for you! (Reload the page to get more)
42a17ac6-1fe7-11f0-b704-4cf95d479851
42a17b34-1fe7-11f0-b704-4cf95d479851
42a17b98-1fe7-11f0-b704-4cf95d479851
42a17bfc-1fe7-11f0-b704-4cf95d479851
42a17c6a-1fe7-11f0-b704-4cf95d479851
42a17cce-1fe7-11f0-b704-4cf95d479851
42a17d3c-1fe7-11f0-b704-4cf95d479851
42a17daa-1fe7-11f0-b704-4cf95d479851
42a17e0e-1fe7-11f0-b704-4cf95d479851
42a17e7c-1fe7-11f0-b704-4cf95d479851
42a17ee0-1fe7-11f0-b704-4cf95d479851
42a17f44-1fe7-11f0-b704-4cf95d479851
42a17fa8-1fe7-11f0-b704-4cf95d479851
42a18016-1fe7-11f0-b704-4cf95d479851
42a18084-1fe7-11f0-b704-4cf95d479851
The sorting of UUIDs in SQL Server is rather confusing and incompatible with UUIDv6 and UUIDv7.
Therefore this method developed by HickelSOFT
generates UUIDs which are sortable by SQL Server.
They have a time resolution of 1 milliseconds combined with 16 bits of random data.
C# implementation |
PHP implementation
Here are 15 UUIDs that were created just for you! (Reload the page to get more)
3aeb6d10-007d-8071-87e9-5ce32bd83b96
28eb6e10-007d-8071-87e9-5ce32bd83b96
e5cb6f10-007d-8071-87e9-5ce32bd83b96
1ae47010-007d-8071-87e9-5ce32bd83b96
b1d67110-007d-8071-87e9-5ce32bd83b96
cd577210-007d-8071-87e9-5ce32bd83b96
ad527310-007d-8071-87e9-5ce32bd83b96
79c37410-007d-8071-87e9-5ce32bd83b96
22867510-007d-8071-87e9-5ce32bd83b96
a8a67610-007d-8071-87e9-5ce32bd83b96
3ff77710-007d-8071-87e9-5ce32bd83b96
60017810-007d-8071-87e9-5ce32bd83b96
091f7a10-007d-8071-87e9-5ce32bd83b96
24387b10-007d-8071-87e9-5ce32bd83b96
32497c10-007d-8071-87e9-5ce32bd83b96
The following types of UUIDs are less common and/or require special knowledge. Please only use the following generators if you know what you are doing.
The NCS UUIDs are a legacy format
initially designed by Apollo Computer that cannot be generated anymore, because the
amount of available timestamp bits was exhausted on 5 September 2015.
As an example, here is the last possible NCS UUID (all bits of the timestamp are set to 1) for IP address 127.0.0.1:
ffffffff-ffff-0000-027f-000001000000
.
An UUIDv2 contains information about the creator (person, group, or organization), the generating system (MAC address), and time. The creator information replaced parts of the time bits, therefore the time resolution is very low.
An UUIDv3 is made out of a MD5 hash and an UUIDv5 is made out of a SHA1 hash. RFC 9562 also contains an example for a custom UUIDv8 implementation that uses modern hash algorithms.
UUIDv8 is made of 122 bits application-specific / custom data. The other 6 bits are used to specify the variant and version of the UUID, to make it RFC-compatible.
You can enter a UUID in the following notations:
9e83839a-5967-11e4-8c1c-78e3b5fc7f22
2.25.210700883446948645633376489934419689250
The script will output:
Please enter a UUID or UUID OID:
You can enter a UUID in the following notations:
AA-BB-CC-DD-EE-FF
AA:BB:CC:DD:EE:FF
AABBCC.DDEEFF
(case insensitive)AA-BB-CC-DD-EE-FF-11-22
(EUI-64)AA:BB:CC:DD:EE:FF-11-22
(EUI-64)fe80::1322:33ff:fe44:5566
(IPv6 Link Local / EUI-64)The script will output:
Please enter a MAC (EUI, ELI, SAI, AAI), or IPv6-Link-Local address:
An Administratively Assigned Identifier (AAI) is a MAC address which can be locally defined by applications or an administrator. Unlike the EUI, an AAI is NOT worldwide unique.
The following options are rather unusual, but are implemented for the sake of completeness: