ippygo
This is a re-write of https://github.com/shivammathur/IPpy which is a parallel testing of IP addresses and domains in python. Reads IP addresses and domains from a CSV file and gives two lists of working and not working ones. Did it just for fun to have a Go -version and maybe benchmark a little bit.
About
Written in Go Testing of IPs and domains is done in parallel.
Currently Mac and Linux are supported (haven't tried Windows) Supports both IPv4 and IPv6 IPs and domain names.
Examples
127.0.0.1 ::1 localhost
Install
cd $GOPATH go get -u github.com/dvwallin/ippygo
Run
$GOPATH/bin/ippygo