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)
019a0019-8d5a-7c00-a9b8-c85583c90690
019a0019-8d5a-7d96-b0e2-c84c4476599f
019a0019-8d5a-7eee-807d-56b899223150
019a0019-8d5b-7090-ba94-011d78e92d6b
019a0019-8d5b-7211-b708-989937a08b28
019a0019-8d5b-7365-bef9-50e779ee6447
019a0019-8d5b-74ad-808d-0bfff5f09667
019a0019-8d5b-75f4-a7d4-0deeed1007fe
019a0019-8d5b-7734-9b00-b1f2faeb9b14
019a0019-8d5b-7877-9899-9b4c9ff8c4b2
019a0019-8d5b-79bb-944b-10078333e102
019a0019-8d5b-7b03-9349-e1f20a26efd8
019a0019-8d5b-7c42-80d9-05c807fe00cb
019a0019-8d5b-7d8a-b0e1-9ba5a661965a
019a0019-8d5b-7ecd-b01e-1f595358d15d
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)
1f0ad75f-9a31-6bb4-946e-4cf95d479851
1f0ad75f-9a31-6e3e-946e-4cf95d479851
1f0ad75f-9a31-6fe2-946e-4cf95d479851
1f0ad75f-9a32-6154-946e-4cf95d479851
1f0ad75f-9a32-62c6-946e-4cf95d479851
1f0ad75f-9a32-642e-946e-4cf95d479851
1f0ad75f-9a32-6596-946e-4cf95d479851
1f0ad75f-9a32-6708-946e-4cf95d479851
1f0ad75f-9a32-6870-946e-4cf95d479851
1f0ad75f-9a32-69d8-946e-4cf95d479851
1f0ad75f-9a32-6bf4-946e-4cf95d479851
1f0ad75f-9a32-6d70-946e-4cf95d479851
1f0ad75f-9a32-6ed8-946e-4cf95d479851
1f0ad75f-9a33-6040-946e-4cf95d479851
1f0ad75f-9a33-619e-946e-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)
62203722-9156-4951-b290-ad9d53d98df5
60b85103-4e4a-42ce-8f56-8615813d3c18
3b69001c-aba3-4ae1-b9dc-b66d7d5b2a79
7d4460e3-2749-4d00-8cee-1ae98384b2aa
887ac117-6e43-4822-904a-ffd41f25af3d
b563ac2d-ef75-46bf-9af6-b92db5b12585
109b740a-966a-448c-86b6-353f8fe8ba25
0b8c6155-33a7-46a4-99a2-b92a281167ac
ab0d08ab-92b9-437f-a605-b37d3b1a4430
9ff560c7-81f9-4621-8d72-df5c61e48b30
06a8552e-ed5e-426d-828b-af0166a82bc6
9499dacd-0391-4799-8476-f556112a0b4e
9b07200b-e82b-450a-8ea2-fcd68977056f
f54e2526-b506-4ea7-9aff-26a5e6713f6c
9f0fa65f-f143-42f8-939b-b44b818bf74d
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)
f9a3398c-ad75-11f0-946e-4cf95d479851
f9a33a36-ad75-11f0-946e-4cf95d479851
f9a33ad6-ad75-11f0-946e-4cf95d479851
f9a33b6c-ad75-11f0-946e-4cf95d479851
f9a33c02-ad75-11f0-946e-4cf95d479851
f9a33ca2-ad75-11f0-946e-4cf95d479851
f9a33d38-ad75-11f0-946e-4cf95d479851
f9a33dce-ad75-11f0-946e-4cf95d479851
f9a33e6e-ad75-11f0-946e-4cf95d479851
f9a33f04-ad75-11f0-946e-4cf95d479851
f9a33fa4-ad75-11f0-946e-4cf95d479851
f9a3403a-ad75-11f0-946e-4cf95d479851
f9a340d0-ad75-11f0-946e-4cf95d479851
f9a34166-ad75-11f0-946e-4cf95d479851
f9a34210-ad75-11f0-946e-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)
69c4f205-4c01-8512-87e9-5ce32bd83b97
de62f305-4c01-8512-87e9-5ce32bd83b97
97e3f405-4c01-8512-87e9-5ce32bd83b97
4107f505-4c01-8512-87e9-5ce32bd83b97
c0b2f605-4c01-8512-87e9-5ce32bd83b97
ab1df705-4c01-8512-87e9-5ce32bd83b97
ef90f805-4c01-8512-87e9-5ce32bd83b97
d99df905-4c01-8512-87e9-5ce32bd83b97
ce69fb05-4c01-8512-87e9-5ce32bd83b97
1c21fc05-4c01-8512-87e9-5ce32bd83b97
3762fd05-4c01-8512-87e9-5ce32bd83b97
78e6fe05-4c01-8512-87e9-5ce32bd83b97
7606ff05-4c01-8512-87e9-5ce32bd83b97
24d80106-4c01-8512-87e9-5ce32bd83b97
26950206-4c01-8512-87e9-5ce32bd83b97
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: