gistfile1.txt

#!/bin/bash
# https://docs.aws.amazon.com/general/latest/gr/aws-ip-ranges.html
amazon_ips=( $(curl -s https://ip-ranges.amazonaws.com/ip-ranges.json | jq -r '.prefixes[] | select(.service=="AMAZON") | .ip_prefix') )
ec2_ips=( $(curl -s https://ip-ranges.amazonaws.com/ip-ranges.json | jq -r '.prefixes[] | select(.service=="EC2") | .ip_prefix') )

containsElement () {
    local element match="$1"
    shift
    for element
    do [[ "$element" == "$match" ]] && return 0; done
    return 1
}

for ip in "${amazon_ips[@]}"
do
    if ! containsElement "$ip" "${ec2_ips[@]}"
    then
        echo $ip
    fi
done