How To Know The Operating System Of Remote Host Without Any Tool


Hie Frnd's !
Today We Are Going 2 Learn , How To Know The Running Operating System Of Remote Host !
Without Using Any Tool //
Yes It May Be Possible Via Simple Command That We Always Use In Our Daily Life !
That is : "PING"
When We Ping Someone's IP Then We Get Reply From Remote Host ! If That Remote Host is in Running State //
For Eg : if we Ping Any Host With His IP , IN My Case :IP is 10.21.105.1 then We Get Result Like This :


Here This is IP of My Switch Which is Running on Linux OS.


These results tell you that 4 Test Packets were sent out of 32 bytes each in size and came back from 10.21.105.1 in a time of 1ms. The TTL figure stands for Time To Live and defines How Long Your Ping requests Bounce Around Before Expiring.


With The Help Of TTL Value We Can Guess the Remote Operating System .

Here The List Of TTL Value , According To This TTL Value's We Can Guess the Remote Host OS .


Windows 9x/NT Intel           >>     TTL=32  
DigitalUnix 4.0 Alpha         >>     TTL=60  
AIX 4.3.x IBM/RS6000          >>     TTL=60  
AIX 4.2.x IBM/RS6000          >>     TTL=60  
Cisco 11.2 7507               >>     TTL=60  
IRIX 6.x SGI                  >>     TTL=60  
Unisys x Mainframe            >>     TTL=64  
Linux 2.2.x Intel             >>     TTL=64 
SCO R5 Compaq                 >>     TTL=64  
FreeBSD 3.x Intel             >>     TTL=64  
OpenBSD 2.x Intel             >>     TTL=64  
Solaris 8 Intel/Sparc         >>     TTL=64  
Netware 4.11 Intel            >>     TTL=128  
Windows 9x/NT Intel           >>     TTL=128  
Windows 2000 Intel            >>     TTL=128  
Cisco 12.0 2514               >>     TTL=255  

NOTE : THE RESULT OF THIS TECHNIQUE MAY NOT BE 100% ACCURATE !!

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