UUID Version 3 Generator
There is no count control on this page: the same namespace and name always produce the same UUID, so asking for ten would return the same value ten times.
What a version 3 UUID is
A version 3 UUID is derived, not generated. It hashes a namespace UUID together with a name using MD5, then fixes the version and variant bits in the result. Feed it the same namespace and the same name and you get the same UUID back, every time and everywhere.
Namespaces
The namespace is what stops your identifiers colliding with another system’s. RFC 9562 defines four standard ones, DNS, URL, OID and X.500, and any UUID of your own works just as well. Whatever you pick, keep it fixed: change the namespace and every identifier derived from it changes with it.
Check it yourself
The DNS namespace with the name example.com always yields 9073926b-929f-31c2-abc9-fad77ae3e8eb. That is what this page opens on, so the UUID above should match it exactly.
Version 3 or version 5
The two are the same construction with a different hash: version 3 uses MD5, version 5 uses SHA-1. Prefer version 5 for anything new. MD5 is the weaker of the two, and there is no upside to choosing it today.
Version 3 is the right answer in exactly one situation: something already produced identifiers this way and yours have to match them. That is a compatibility requirement, not a design choice.
Neither version is a security mechanism, and a derived UUID is not a secret: the name that produced it may well be guessable.