Man pages matching name knet_host_get_id_by_host_name in section 3:

knet_host_get_id_by_host_name.3.en	debian 10 / libknet-doc
knet_host_get_id_by_host_name.3.en	debian 11 / libknet-doc
knet_host_get_id_by_host_name.3.en	debian 12 / libknet-doc