Address Book

The address book contains the node ID and and node address information required to sync with Hedera node(s) in a specific network.  The mainnet address book file ID is 0.0.102. You can obtain the address book information by requesting the contents of the file 0.0.102 (FileContentsQuery()). The network information can also be found in your Hedera portal account.
The testnet address book information is also available in the Hedera portal. 
Example:
Get testnet address book
Java
JavaScript
Java
// Get file contents
byte[] contents = new FileContentsQuery()
    .setFileId(FileId.ADDRESS_BOOK)
    .execute(client);
​
// Prints query results to console
System.out.println("File content query results: " + new String(contents));
JavaScript
const { Client, FileContentsQuery, FileId } = require("@hashgraph/sdk");
​
async function main() {
    const operatorPrivateKey = process.env.OPERATOR_KEY;
    const operatorAccount = process.env.OPERATOR_ID;
​
    if (operatorPrivateKey == null || operatorAccount == null) {
        throw new Error("environment variables OPERATOR_KEY and OPERATOR_ID must be present");
    }
​
    const client = new Client({
        network: { "0.testnet.hedera.com:50211": "0.0.3" },
        operator: {
            account: operatorAccount,
            privateKey: operatorPrivateKey
        }
    });
​
    const resp = await new FileContentsQuery()
        .setFileId(FileId.ADDRESS_BOOK)
        .execute(client);
​
    console.log(resp.contents);
}
​
main();
Output
​
File content query results: 
�0.0.5"�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
�0.0.6"�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
�0.0.3"�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
�0.0.4"�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
​
Client
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