How owns the code?

Hi All,

I just got off a YUGE jobs where I installed two servers, a
firewall, and redid their networking.  Part of what I did
was a lot of coding to getting things all working as expected.

Question: who own the code I created.  I do not list
code as a part (merchandise) on my invoices.  I only
charge for the labor.

Many thanks,
-T