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This means that any combination of input and namespace will produce the same UUID each time. The important thing to note is that the UUID v5 is consistent. Use the SHA1 hash algorithm to convert this two information into UUID. Unlike versions 1 or 4, UUID v5 is generated by providing two input information, an "Input string" being any string that can be changed in your application and a "Namespace" being a fixed UUID used in conjunction with the input string to distinguish UUIDs generated in different applications. If you need backward compatibility (compatible with another system that generates UUIDs from names), use this feature. This will generate a unique ID from the MD5 hash of the namespace and name. UUID v3 is generated by providing two input information, an "Input string" being any string that can be changed in your application and a "Namespace" being a fixed UUID used in conjunction with the input string to distinguish UUIDs generated in different applications.
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Therefore, it is not possible to identify information about the source by looking at the UUID. The bits containing UUID v4 are randomly generated and have no inherent logic. Universally Unique IDs (UUIDs) are a type of 128-bit number that can be used to generate unique values across many computers and across time.
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The generation of v4 UUID is much easier. In this case, the chance of collision changes from impossible to very small due to random bits. You will certainly get a totally unique ID, unless you generate the ID on the same computer at the same time. These UUID v1 are easy to predict (given one, I may be able to guess the other) and can be traced back to your network card. In addition, it also uses another random component to guarantee its exclusivity.
#Online uuid generator mac
UUID v1 is generated by combining the host's MAC address with the current date and time.
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If you only need a unique ID, use version 1 or 4.UUID - (from English: Universally Unique IDentifier ) Basically, there are two different needs to generate a UUID: The size and the process of generating the identifier need to be selected in order to make this improbability sufficient in practice. 36614423-8e61-41ab-9ec8-29d211738cf2 The word "unique" should be taken to mean "practically unique" since the identifiers have a finite size, it is possible for two different items to share the same identifier.
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