user4372: I'm querying this address on testnet, which has had two transactions, yet cardano-cli shows none:
cardano-cli query utxo \
   --testnet-magic 1097911063 \
   --address addr_test1qrth9u0url08lh3wyyvs9t5rehuwvmlymechalx3l4ednt37ljw2qfmeg3wrlqzp6zuswfr65gunuugh8mf80naz28msdws93h

                           TxHash                                 TxIx        Amount
--------------------------------------------------------------------------------------

Why is that?

user28: You are querying if the specific address contains UTxOs, not past transactions.
cardano-node sees only the current state of the blockchain, not historical events. For that, you will need to use cardano-db-sync or a hosted alternative such as https://blockfrost.io.

user1045: You're querying UTxOs and not transactions. In order to explore list of transactions you're best off using explorer for testnet or mainnet.
If you you need to explore transactions from some app or script either use self-hosted cardano-graphql stack, gimbalabs hosted cardano-graphql and or blockfrost.

4372: <p>I'm querying <a href="https://explorer.cardano-testnet.iohkdev.io/en/address?address=addr_test1qrth9u0url08lh3wyyvs9t5rehuwvmlymechalx3l4ednt37ljw2qfmeg3wrlqzp6zuswfr65gunuugh8mf80naz28msdws93h" rel="nofollow noreferrer">this address on testnet</a>, which has had two transactions, yet <code>cardano-cli</code> shows none:</p>
<pre><code>cardano-cli query utxo \
   --testnet-magic 1097911063 \
   --address addr_test1qrth9u0url08lh3wyyvs9t5rehuwvmlymechalx3l4ednt37ljw2qfmeg3wrlqzp6zuswfr65gunuugh8mf80naz28msdws93h

                           TxHash                                 TxIx        Amount
--------------------------------------------------------------------------------------
</code></pre>
<p>Why is that?</p>
 28: <p>You are querying if the specific address contains UTxOs, not past transactions.</p>
<p><code>cardano-node</code> sees only the current state of the blockchain, not historical events. For that, you will need to use <code>cardano-db-sync</code> or a hosted alternative such as <a href="https://blockfrost.io" rel="nofollow noreferrer">https://blockfrost.io</a>.</p>
 1045: <p>You're querying UTxOs and not transactions. In order to explore list of transactions you're best off using explorer for <a href="https://explorer.cardano-testnet.iohkdev.io/en" rel="nofollow noreferrer">testnet</a> or <a href="https://explorer.cardano.org/en" rel="nofollow noreferrer">mainnet</a>.</p>
<p>If you you need to explore transactions from some app or script either use self-hosted cardano-graphql stack, gimbalabs hosted cardano-graphql and or blockfrost.</p>
