How to find the SQL Server Instances running across the given activer directory domain?

Question

How to find the SQL Server Instances running across the given activer directory domain?
I have though of OSQL -L , Microsoft Assessment and Planning ( MAP ) tool and SQLPing3 (SQLSecurity) might help me.
I would appreciate if there any other way of finding the SQL Servers / Instances running across the given active directory domain.
Sivaprasad S
http://sivasql.blogspot.com
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Answer 1

Dear ,
Very simple u find all instances through the customized sp which is get all details about inventory. Like i put the sp bellow. This is without any tool. 
USE [master]
GO
/****** Object:  StoredProcedure [dbo].[DBStatus]    Script Date: 08-01-2015 19:46:11 By Damodar Patle Sr. DBA Mumbai India ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[DBStatus] 
AS
SELECT 
SERVERPROPERTY('servername') AS ServerName,
ConnectionProperty('local_net_address') AS 'local_net_address',
ConnectionProperty('local_tcp_port') AS 'local_tcp_port',
CONVERT(VARCHAR(25), @@VERSION) as  VERSIONSQL,
SERVERPROPERTY('ErrorLogFileName') AS ErrorLogFilePath,
database_id,
CONVERT(VARCHAR(25), DB.name) AS DBName,
CONVERT(VARCHAR(10), DATABASEPROPERTYEX(name, 'status')) AS [Status],
CONVERT(VARCHAR(10), DATABASEPROPERTYEX(name, 'Recovery')) AS [Recovery_Model],
create_date as DBCreate_Date, --physical_device_name,
 (SELECT COUNT(1) FROM sys.master_files WHERE DB_NAME(database_id) = DB.name AND type_desc = 'rows') AS DataFiles,
 (SELECT SUM((size*8)/1024) FROM sys.master_files WHERE DB_NAME(database_id) = DB.name AND type_desc = 'rows') AS [Data MB],
 (SELECT COUNT(1) FROM sys.master_files WHERE DB_NAME(database_id) = DB.name AND type_desc = 'log') AS LogFiles,
 (SELECT SUM((size*8)/1024) FROM sys.master_files WHERE DB_NAME(database_id) = DB.name AND type_desc = 'log') AS [Log MB],
 (SELECT physical_name FROM sys.master_files WHERE DB_NAME(database_id) = DB.name AND type_desc = 'rows') AS MDF_File_Location,
 (SELECT physical_name FROM sys.master_files WHERE DB_NAME(database_id) = DB.name AND type_desc = 'log') AS  LDF_File_Location,
   user_access_desc
   FROM sys.databases DB
   ORDER BY dbName, [Log MB] DESC, NAME