proxycheck(1) on Linux
The text 94ede47e088f, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
open proxy server checker
Flags it lists
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-D -
-M -
-a -
-b -
-h -
-i -
-m -
-n -
-p -
-s -
-t -
-v -
-x