2025-10-29
IPv4 scarcity drives widespread use of Carrier-Grade Network Address Translation, a practice in ISPs and mobile networks that places many users behind each IP address, along with their collected activity and volumes of traffic. We introduce the method we’ve developed to detect large-scale IP sharing globally and mitigate the issues that result. ...
2025-10-28
We present a data-driven framework to quantify cross-layer Internet resilience. We also share a list of measurements with which to quantify facets of Internet resilience for geographical areas....
2025-10-27
The Internet is one big open system composed of many closed boxes — which makes measuring the Internet difficult. In this post we explore Internet measurement as a science....
2025-10-27
While large cloud providers hold vast troves of passive network data, analyzing them is complicated. The scale, noise, and absence of definitive ground truth all create major hurdles. Yet by carefully quantifying these constraints and finding alternative forms of evidence, meaningful insights can still emerge....
2024-11-08
We describe how Cloudflare uses a custom Lisp-like programming language and formal verifier (written in Racket and Rosette) to prevent logical contradictions in our authoritative DNS nameserver’s behavior....
2024-09-05
Cloudflare brings visibility to the practice of connection tampering as observed from our global network....
2022-12-16
A discussion about IP blocking: why we see it, what it is, what it does, who it affects, and why it’s such a problematic way to address content online....
2021-10-15
In this article we describe an alternative approach to active measurements, which accurately predicts network latencies using only passively collected data....
2021-10-14
IP addresses associated with names, interfaces, and sockets, can tie these things together in a way that IP was never designed to support. This post describes Cloudflare efforts to decouple of IP addresses from names, the latest in a quest for something we’re calling Addressing Agility....
2021-07-26
Cloudflare is excited to announce Project Pangea. We’re launching a program that provides secure, performant, reliable access to the Internet for community networks that support underserved communities, and we’re doing it for free because we want to help build an Internet for everyone....
