> ## Documentation Index
> Fetch the complete documentation index at: https://hedera-0c6e0218-mintlify-4a9eb0b1.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ScheduleID

> Hedera protobuf reference for the ScheduleID message, a unique identifier for a Schedule entity used by the Hashgraph scheduled transaction service.

A unique identifier for a Schedule.

| Field         | Type  | yDescription                   |
| ------------- | ----- | ------------------------------ |
| `shardNum`    | int64 | The shard number (nonnegative) |
| `realmNum`    | int64 | The realm number (nonnegative) |
| `scheduleNum` | int64 | A nonnegative schedule number  |