1. Active DNS Project. https://activednsproject.org/. Accessed: 17-04-2017. Active DNS Project. https://activednsproject.org/. Accessed: 17-04-2017.
2. AWS Public IP Ranges. https://ip-ranges.amazonaws.com/ip-ranges.json. Accessed: 17-04-2017. AWS Public IP Ranges. https://ip-ranges.amazonaws.com/ip-ranges.json. Accessed: 17-04-2017.
3. Common Crawl. https://commoncrawl.org/. Accessed: 17-04-2017. Common Crawl. https://commoncrawl.org/. Accessed: 17-04-2017.
4. Google Public IP API. https://github.com/bcoe/gce-ips/blob/master/index.js. Accessed: 17-04-2017. Google Public IP API. https://github.com/bcoe/gce-ips/blob/master/index.js. Accessed: 17-04-2017.
5. McAfee SiteAdvisor. http://www.siteadvisor.com/. Accessed: 10-08-2016. McAfee SiteAdvisor. http://www.siteadvisor.com/. Accessed: 10-08-2016.