Samuel Yates began, and this site continues, a database of the largest known primes. Primes in that database are assigned a proof-code to show who should be credited with the discovery as well as what programs and projects they used. (Discoverers have one prover-entry, but may have many proof-codes because they use a variety of programs...)
This page provides data on L643, one of those codes.
Code name (*): L643 Persons (*): 1 (counting humans only) Projects (*): 1 (counting projects only) Display (HTML): DeRidder, TwinGen, PrimeGrid, LLR Number of primes: total 4 Unverified Primes: 0 (prime table entries marked 'Composite','Untested', or 'InProcess') Score for Primes (*): total 44.0610
Below is additional information about this entry.
Display (text): DeRidder, TwinGen, PrimeGrid, LLR Display (short): DeRidder Database id: 3674 (do not use this database id, it is subject to change) Proof program: LLR Entry last modified: 2020-07-08 00:20:15