1. 2.5Tbps DDoS Attack on Google. https://cloud.google.com/blog/products/identity-security/identifying-and-protecting-against-the-largest-ddos-attacks. Accessed 11 Jan 2022
2. dnspython. https://www.dnspython.org/. Accessed 11 Jan 2022
3. IP2Location. https://www.ip2location.com/. Accessed 11 Jan 2022
4. MassDNS, A high-performance DNS stub resolver. https://github.com/blechschmidt/massdns. Accessed 11 Jan 2022
5. Open Resolver Project. https://web.archive.org/web/20200603050044/http://openresolverproject.org/. Accessed 11 Jan 2022