How do you manage firewall rules at your organization?

I work in an MNC, easily above 100,000 employees. Firewall requests are stored in excel sheets along with their request ID's and other stuff. And there are many many of them, because we have many layers/zones. DMZ, LAN, partner companies etc.... It's segmented right and left.

So basically every firewall rule is added in an excel stored in a shared drive, looked and cleared by a security team, and then goes to the implementation team.

I'm curious to what the rest of the world is doing. Do you use excel to store all the rules or do you have a custom web page with a DB or some other software/application? I'm not talking about the ticketing system either.