snowflake-uid-service/README.md

Snowflake UID Service

• (0..41] bits for .01s since $EPOCH (697y span)
• (41..54] bits for sequence (4096)
• (54..64] bits for hostid (1024 hosts)

for up to 419_430_400 = 1024*100*4096 ids per second

Original

• source: https://github.com/twitter-archive/snowflake/tree/snowflake-2010
• tldr
  • [0..41] bits for timestamp
  • (41..x] bits for hostid
  • (x..64) bits for sequence