Where can I find the canister-id for the mainnet ledger canister?

Developers
2

You can find it here, along with others: https://k7gat-daaaa-aaaae-qaahq-cai.ic0.app/listing/nns-ledger-10244/ryjl3-tyaaa-aaaaa-aaaba-cai

You can also click view did file there and change languages to get the interface as Candid, Motoko etc.