Her.st Whois API
API
The usage is explained on the API page.
Sample
#!/usr/bin/env bash
# requires whois
ip=$(rofi -dmenu -p "IP:" | tr -d ' ' | tr -d ':')
if [ -z "$ip" ]; then
exit 0
fi
whois $ip | sed '/^$/d' | sed '/^#/d'| sed '/^remarks/d' | sed '/^%/d' | rofi -dmenu -l 20