Man pages matching name rblcheck in section 1:

rblcheck.1.en	debian 10 / rblcheck
rblcheck.1.en	debian 10 / udns-utils
rblcheck.1.en	debian 11 / rblcheck
rblcheck.1.en	debian 11 / udns-utils
rblcheck.1.en	debian 12 / rblcheck
rblcheck.1.en	debian 12 / udns-utils