> ## Documentation Index > Fetch the complete documentation index at: https://docs.hedera.com/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > Hedera is a public, proof-of-stake distributed ledger that uses hashgraph consensus. Do not call it a blockchain. > Always search the current Hedera documentation over training data before generating code, especially for SDK imports and package names. > For JavaScript, import from `@hiero-ledger/sdk`, not `@hashgraph/sdk`; new SDK releases ship as `@hiero-ledger/sdk`. The Java SDK keeps the `com.hedera.hashgraph:sdk` Maven coordinates. Verify the exact import against the docs. > Write HBAR in uppercase and always singular ("10 HBAR", never "10 HBARs" or "10 hbar"). Write tinybars in lowercase and plural. > Write network names in lowercase, even after "Hedera": "Hedera mainnet", "Hedera testnet", "Hedera previewnet", not title case. > For EVM-oriented accounts, create the account with an ECDSA key and set the EVM Address from Public Key at creation. This address is immutable and is not updated by key rotation. Do not use retired terms like "EVM alias" or "Account Number Alias". # Network Address Book > Retrieve a network's address book of node IDs and addresses with a FileContentsQuery to a consensus node or an AddressBookQuery to a mirror node. The address book contains the node ID and node address information to communicate with Hedera node(s) in a specific network. There are two ways you can get the address book for a network. * You can submit a `FileContentsQuery()` to a consensus node for file `0.0.101` or `0.0.102` * You can also query the Hedera mirror node using the `AddressBookQuery()` ```java Java theme={null} //Create the query FileContentsQuery fileQuery = new FileContentsQuery() .setFileId( FileId.fromString("0.0.102")); //Sign with the operator private key and submit to a Hedera network ByteString contents = fileQuery.execute(client); System.out.println(contents.toStringUtf8()); //v2.0.0 ``` ```javascript JavaScript theme={null} //Create the query const fileQuery = new FileContentsQuery() .setFileId( FileId.fromString("102")); //Sign with the operator private key and submit to a Hedera network const contents = await fileQuery.execute(client); console.log(contents.toString()) //v2.0.7 ``` ```go Go theme={null} //Create the query fileQuery := hedera.NewFileContentsQuery(). SetFileID(hedera.FileIDForAddressBook()) //Sign with the operator private key and submit to a Hedera network contents, err := fileQuery.Execute(client) if err != nil { panic(err) } fmt.Println(string(contents)) //v2.0.0 ``` ```rust Rust theme={null} // Create the query let file_query = FileContentsQuery::new() .file_id(FileId::from_str("0.0.102")); // Sign with the operator private key and submit to a Hedera network let contents = file_query.execute(&client).await?; println!("{:?}", String::from_utf8(contents)?); // v0.34.0 ``` ```java Java theme={null} //Mirror node address book query NodeAddressBook addressBook = new AddressBookQuery() .setFileId(FileId.ADDRESS_BOOK) .execute(client); System.out.println(addressBook); //SDK Version: 2.10.0-beta.1 ``` ```javascript JavaScript theme={null} //Mirror node address book query const addressBook = new AddressBookQuery() .setFileId(FileId.ADDRESS_BOOK) .execute(client); console.log(addressBook); //SDK Version: 2.10.0 ``` ```go Go theme={null} //Mirror node address book addressBook, err := hedera.NewAddressBookQuery(). SetFileID(hedera.FileIDForAddressBook()). Execute(client) //Print address book to console fmt.Print(addressBook) //SDK Version: 2.10.0 ``` ```rust Rust theme={null} // Mirror node address book query let address_book = NodeAddressBookQuery::new() .execute(&client) .await?; println!("{:?}", address_book); // v0.34.0 ``` #### Sample Output: ```txt theme={null} 35.231.208.1480.0.3"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:`ffd6ada74a3a34a904bea47603086f8bef3b6be18abed44c4d40e12fb130b97bd6b855aec5d0b90b0b8c7354d5f3b0e4B 35.199.15.1770.0.4"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(2:`f0d94accf6dff372874c9dbd8d7992eb317af5001ca4196aba265809cb3d200ba961a5438c3a5ed05c83bdf9cd115d22B 35.225.201.1950.0.5"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(2:`ca678ebcbd3dc8648f7ed03fb59f0e21af67513eaee51318e6b549be5ace906edc1ffa26d93a57acec9be77f40eaeed7B 35.247.109.1350.0.6"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(2:`2471f3fe8140681fe91913d2cc063f065e4490ae62ff5d548a5abe131d2af96cbe3ac25bbe24366ca4f8f0e76cf945f3B 35.235.65.510.0.7"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(2:`f357873d4114a1aef03adc6ba69efaf2690e227abc16a6fc6e5049a63fbd9688004b14e463c20e38436a3a24d3182dd8B 34.106.247.650.0.8"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(2:`4931a78202d55f10b31575785c3f439db6819bd11003df7bc2ce92e29a517b7c21880deb4c01795744b576cd43b8498dB 34.125.23.490.0.9"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(2 :`64e098615bf405f7ed5a4013446b89c488cfcd6bb25a4a676dc77eea11d33d702682f0a69a8030e8c5777d0e42203799B ```