/usr/share/man/man5/ipfilter.conf.5.gz is in netscript-ipfilter 5.4.10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man5/netscript-ipfilter.conf.5.gz
/usr/share/man/man5/netscript-ipfilter.conf.5.gz