How to do NCrack bruteforcing for http-get service using -iL (mass scan) options where server is having different port.
Without more context we won't be able to provide exact guidance. But the following sounds like what you'll need:
ncrack -U usernames.txt -P passwords.txt -iL hosts.txt -p8080
-U defines either a single user name or a file containing user names to try. -P defines either a single password or a file containing passwords to try -iL options allows you to define multiple hosts names in a file -p allows you to select a different port for the hosts than default port 80(for http-get) - in this case port 8080.
Remember to only use this tool with explicit permissions from system owners.