This is the Bunny CDN tech stack / backend infrastructure
Anti-DDoS proxy: DPDK https://www.dpdk.org/
Caching & logic: OpenResty https://github.com/openresty/openresty (https://openresty.org/en/) (formerly NGINX)
Hosting provider: https://www.datapacket.com/ (also uses a few others depending on the location)
DNS hosting provider: https://www.datapacket.com/ (bare metal anycasted DNS)
DNS server software: x