GenetomULID

GenetomULID is a high-performance 64-bit ULID generator for distributed systems.
It uses a compact bit layout:

• 41 bits → Timestamp (milliseconds since custom epoch)
• 10 bits → Server/Machine ID
• 12 bits → Sequence per millisecond

This allows up to 4096 IDs per server per millisecond and supports 1024 unique servers in a cluster.

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📦 Installation

dotnet add package Genetom.ULID

NuGet Package Link

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🚀 Usage

using Genetom.ULID;

// One time initialization in program.cs
GenetomULID.SetServerId(12); // Optional , Default serverId is 0

long id = GenetomULID.GenerateId64();

Console.WriteLine(id);

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⚙️ Bit Layout

Bits	Field	Description
41	Timestamp	Milliseconds since custom epoch
10	Server ID	Unique per server (0–1023)
12	Sequence	Counter per millisecond (0–4095)

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📊 Benchmark (BenchmarkDotNet)

Method	Mean	Error	StdDev	Gen0	Allocated
GenetomULID_GenerateId64	33.21 ns	0.571 ns	0.506 ns	0.0038	32 B
GenerateGUID	39.02 ns	0.798 ns	0.980 ns	-	-

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📝 License

MIT