Man pages matching name subpage_prot in section 2:

subpage_prot.2.en	debian 10 / manpages-dev
subpage_prot.2.en	debian 11 / manpages-dev
subpage_prot.2.fr	debian 11 / manpages-fr-dev
subpage_prot.2.en	debian 12 / manpages-dev
subpage_prot.2.fr	debian 12 / manpages-fr-dev
subpage_prot.2.ru	debian 12 / manpages-ru-dev