UUIDv8 Builder Demo

ステップバイステップで構築する独自のUUIDv8設計

Local Environment • Persistence via localStorage

📄 Specification (仕様書) →

Current Hexadecimal

Current Binary (128-bit)

Step 1: Part 1 & 2 Initialization

Enter UUID or 12 Hex Characters (48 bits)

First 48 bits (highlighted) will be used for Part 1 & 2. Part 5 (Node) is NOT affected.

Step 2: Binary Customization (Bits 52-55 & 66-71)

Part 3: Post-Version (4 bits)

Part 4: Post-Variant (6 bits)

Step 3: Byte Customization (Hex or ASCII)

Part 3 Lower Byte (Byte 7)

Part 4 Lower Byte (Byte 9)

Step 4: Part 5 Customization (Node / 48 bits)

Part 5 Hex Value (12 chars)

HEX

UUID Structure Reference

v1 Gregorian Time

Part 1

time_low (32 bits)

Part 2

time_mid (16 bits)

Part 3

0001 + time_hi (12 bits)

Part 4

10 + clock_seq (14 bits)

Part 5

node (48 bits)

v6 Reordered Time

Part 1

time_hi (32 bits)

Part 2

time_mid (16 bits)

Part 3

0110 + time_low (12 bits)

Part 4

10 + clock_seq (14 bits)

Part 5

node (48 bits)

v7 Unix Epoch Time

Part 1

unix_ts_ms (32 bits)

Part 2

unix_ts_ms (16 bits)

Part 3

0111 + rand_a (12 bits)

Part 4

10 + rand_b (14 bits)

Part 5

rand_b (48 bits)