Both unx(https://opengrok.libreoffice.org/xref/core/sal/osl/unx/socket.cxx?r=252132d9#osl_createInetSocketAddr) and win(https://opengrok.libreoffice.org/xref/core/sal/osl/w32/socket.cxx?r=db392a8a#osl_createInetSocketAddr) implementations of the functions used there in the acceptor use inet_pton (and its W variant) with AF_INET, never with AF_INET6
From the linked ask.LO question: nohup /opt/libreoffice7.5/program/soffice -headless -accept=“socket,host=::1,port=8200;urp;” -nofirststartwizard & > this process stopped somewhere on the way and never completed. It kept the CPU > 100% busy all the time. The startup doesn’t happen and port in never listened. Two more back in 2016 from the same author, and likely same as this report? - https://ask.libreoffice.org/t/do-you-support-ipv6/19482 - https://ask.libreoffice.org/t/how-to-run-soffice-bin-in-headless-mode-on-a-ipv6-machine/19423 Marking as new for an enhancement, but more dev advice welcome.