Takes a file with hostnames and scans for supported protocols using Application-Layer Protocol Negotiation. By default, it scans for IANA's list of ALPN protocol ids.
go install github.com/Martinvks/alpnscanner@latest
$ cat hosts.txt
example.com
example.no
example.se
$ alpnscanner -h hosts.txt
example.com:443 [http/1.1 h2]
example.no:443 []
example.se:443 [http/1.1]
-h string
hosts file path
-c int
concurrency (default 10)
-m string
mode specifies which protocols to scan for. Must be one of "iana", "http" or "h2draft" (default "iana")
-p int
port (default 443)
The iana mode scans for the protocols listed here.
The http mode uses the same list, but only scans for HTTP protocols.
The h2draft mode scans for draft versions of HTTP/2.