dnstcpbench(1) on Linux
The text c57aa0c28bf9, as Debian 9 (Stretch) shipped it.
tool to perform TCP benchmarking of nameservers
Flags it lists
-
--file -
--help -
--timeout-msec -
--udp-first -
--verbose -
--workers -
-f -
-h -
-u -
-v