You can do something like below:
SELECT [COMPUTER_NAME]
,[COMPUTER_DOMAIN_NAME]
,[CURRENT_LOGIN_USER]
,[CURRENT_LOGIN_DOMAIN]
,[IP_ADDR1]
FROM [SymantecEndpointProtectionManager].[dbo].[SEM_COMPUTER]
WHERE [IP_ADDR1] = 'DECIMAL VALUE'
Note that IP_ADDR1 field is a decimal representation of the IP address.
You wrote:
> I would like to create an SQL query for an internal program that takes an IP address and returns the user
It is probably easier to lookup the IP address and query for COMPUTER_NAME than IP Address or else you will have to incorporate IP_Address to decimal conversion and query for that (see http://www.ipaddresslocation.org/convertip.php for example).