user25002: I want to access unspent data of a specific bitcoin address.
I am trying this command
bitcoin-cli -regtest listunspent "some bitcoin address"
But I am always getting an empty list. I am using local bitcoind server on windows 7.
What should I do or use any function for getting desired output ? 

user60371: As mentioned here, you can first get the addresses of an account using getaddressesbyaccount and then list all the unspent of those addresses using 
bitcoin-cli listunspent 6 9999999 "[\"1PGFqEzfmQch1gKD3ra4k18PNj3tTUUSqg\",\"1LtvqCaApEdUGFkpKMM4MstjcaL4dKg8SP\"]"  

where 6 and 9999999 are the min and max confirmations

user86928: In order to get the list unspent of a specific bitcoin address( not belongs to your wallet), you must first import the address to wallet using importaddress
 This RPC does not require the private key of that address. Note that this will cause the program to rescan the entire blockchain, which will take several minutes.
now you can use the listunspent call to get the UTXO. 
Edit: use rescan : true if you are importing already existing address

user24925: listunspent only displays information about addresses which are currently part of your wallet. Bitcoin Core does not maintain indexes of unspent outputs for addresses you do not own, and will simply return a blank set if you attempt to query for them. 

25002: <p>I want to access unspent data of a specific bitcoin address.</p>

<p>I am trying this command</p>

<p>bitcoin-cli -regtest listunspent "some bitcoin address"</p>

<p>But I am always getting an empty list. I am using local bitcoind server on windows 7.</p>

<p>What should I do or use any function for getting desired output ? </p>
 60371: <p>As mentioned <a href="https://chainquery.com/bitcoin-api/listunspent" rel="nofollow noreferrer">here</a>, you can first get the addresses of an account using <code>getaddressesbyaccount</code> and then list all the unspent of those addresses using </p>

<pre><code>bitcoin-cli listunspent 6 9999999 "[\"1PGFqEzfmQch1gKD3ra4k18PNj3tTUUSqg\",\"1LtvqCaApEdUGFkpKMM4MstjcaL4dKg8SP\"]"  
</code></pre>

<p>where 6 and 9999999 are the <code>min</code> and <code>max</code> confirmations</p>
 86928: <p>In order to get the list unspent of a specific bitcoin address( not belongs to your wallet), you must first import the address to wallet using <strong><a href="https://bitcoin.org/en/developer-reference#importaddress" rel="nofollow noreferrer">importaddress</a></strong>
 This RPC does not require the private key of that address. Note that this will cause the program to rescan the entire blockchain, which will take several minutes.</p>

<p>now you can use the listunspent call to get the UTXO. </p>

<p>Edit: use rescan : true if you are importing already existing address</p>
 24925: <p><code>listunspent</code> only displays information about addresses which are currently part of your wallet. Bitcoin Core does not maintain indexes of unspent outputs for addresses you do not own, and will simply return a blank set if you attempt to query for them. </p>
