First you need to provision a blob file to connect a particular machine.
You need to use a seperate blob file for each machine that you want to join offline.
djoin /provision /domain exampledomain.com /machine Win8example01 /savefile c:\folder\blob.txt
Then you need to sneaker net the blob file to the target computer
and on the client computer
djoin /requestODJ /loadfile c:\folder\blob.txt /windowspath %SystemRoot% /localOS
reboot the computer and it will join the domain.