All firefighter codes are 1111 this also works for gated communities
Lol
Discussion
Hacking a fire alarm is more like a prank
Unless you actually want to clear out a building
Then it's an op
If the people weren't lazy during configuration and set up -- then you can reset everything to the defaults and literally look at the publicly available manual to see what those defaults are
Like in this picture:
^ something I learned a long time ago
Firefighters get special access codes that are literally just all ones - most pins are 4 digits - there's no need to remember various numbers, possibly get confused, or waste time hunting and pecking for the right digits.... It works on more than just gated communities, but I thought that would be the best example.