ipcalc is older than 2015, but it lived in a different repository: https://github.com/fedora-sysv/initscripts/commits/3137737948ea40b3c7b69ea1f35199749e78b870/

ipcalc is older than 2015, but it lived in a different repository: https://github.com/fedora-sysv/initscripts/commits/3137737948ea40b3c7b69ea1f35199749e78b870/src/ipcalc.c https://github.com/fedora-sysv/initscripts/commits/313773794... ipcalc gets removed here: https://github.com/fedora-sysv/initscripts/commit/76201baf7a731c936e57369549dd537bfcd6a191 https://github.com/fedora-sysv/initscripts/commit/76201baf7a... All in all it looks like ipcalc predates sipcalc by three years (1998 vs 2001)