| LS | Title | From | To | Approval date |
| SG2-LS207 | LS/r on work progress on Quantum Key Distribution Network (QKDN) in FG-QIT4N (as of February and as of May 2021) (reply to FG-QIT4N-LS16, FG-QIT4N-LS19) | SG2 | FG-QIT4N; | 2021-06-11 |
| FG-QIT4N-LS19 | LS on work progress on Quantum Key Distribution Network (QKDN) in FG QIT4N (as of May 2021) | FG-QIT4N | IETF; IEEE; ISO/IEC JTC1/SC27; IEC TC 86; SG2; SG11; SG13; SG15; SG17; ETSI ISG QKD; IRTF QIRG; CEN/CENELEC FG QT; ISO/IEC JTC1/WG14; | 2021-05-21 |
| FG-QIT4N-LS16 | LS on work progress on Quantum Key Distribution Network (QKDN) in FG QIT4N (as of February 2021) | FG-QIT4N | IETF; IEEE; ISO/IEC JTC1/SC27; IEC TC 86; SG2; SG11; SG13; SG15; SG17; ETSI ISG QKD; IRTF QIRG; CEN/CENELEC FG QT; ISO/IEC JTC1/WG14; | 2021-02-05 |