Transponder codes: Any rhyme or reason?

Interesting about the codes and how they're used. That explains a couple things. Just today I flew down to Aircraft Spruce to pick up a few items, and decided to get FF, in the hope that I would be allowed to transit the ATL class B. On initial call up, I was given a code to squawk. A 32 something.
When I got the "radar contact, atl alt 2996" It was followed by "squawk 0123, cleared through bravo". I was still about 15 miles out of bravo.
On the return trip was given the code 73 something. And kept that code untill I canceled FF, and started my descent to JZP.
I had never been given a code beginning with a zero until today.

Yep, local VFR code. I fly with a zero at the beginning everyday for work. ;)
 
I get the same here.

From my understanding, the 02-- codes are local codes for VFR flights that stay within the local airspace. The Center has a bank of codes for flights that also just remain in their airspace. Different sets of codes for different airspace is organized in a way to minimize the need to change the beacon code's while in the air and also to avoid overlap with other nearby facilities.

If you are issued a 5--- code, ATC is putting you "in the system." Ex. A VFR cross country flight that will fly through multiple sectors of airspace.

IFR codes are dispensed in a similar manner, although they are not always limited to a certain series of numbers.
Our code earlier was 1666. What does that mean lol
 
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