> ## Documentation Index
> Fetch the complete documentation index at: https://hedera-0c6e0218-mintlify-bc559771.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# RealmID

> RealmID is the Hedera protobuf identifier for a realm within a shard, grouping accounts, files, and smart contracts under a unique numeric ID.

The ID for a realm. Within a given shard, every realm has a unique ID. Each account, file, and contract instance belongs to exactly one realm.

| Field      | Description                    |
| ---------- | ------------------------------ |
| `shardNum` | The shard number (nonnegative) |
| `realmNum` | The realm number (nonnegative) |