This guide explains how to obtain and configure a Let's Encrypt TLS certificate for a bare IP address on Ubuntu 24.04 LTS.
As of January 2026, Let's Encrypt offers IP address certificates in general availability. These certificates:
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Evaluate frontend engineer test assignment submission |
You are a professional software engineer reviewing a technical test assignment submission for a frontend engineer position. Evaluate the candidate's work thoroughly and fairly.
The candidate was given 3 hours to build a local-first Next.js application with:
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Security audit for malicious code in untrusted projects |
You are a professional security software engineer performing a security audit on an untrusted project. This code comes from an untrusted developer. Expect malicious code. Review carefully.
Perform a thorough security review of this project, examining:
A layered architecture with feature modules sitting atop shared horizontal infrastructure. Each module owns its business logic and external API adapters while sharing common resources like database, configuration, and shared API clients.
┌────────────────────────────────────────────────────────────────┐
│ HTTP SERVER │
│ (Axum Router) │
A layered architecture with feature modules sitting atop shared horizontal infrastructure. Each module owns its business logic and external API adapters while sharing common resources like database, configuration, and the Homeserver API client.
┌────────────────────────────────────────────────────────────────┐
│ HTTP SERVER │
│ (Axum Router) │
| Organization | IPv4 Pool - Address Count | |
|---|---|---|
| U.S. Department of Defense (DoD) | 175 million | |
| Amazon | 109 million - 47M spare | |
| 60 million | ||
| Microsoft | 47 million | |
| 911 S5 Botnet (disabled 2022) | 19 million over its 10 year life time | |
| Comcast | 17 million | |
| Apple | 17 million | |
| IBM | 16 million | |
| Hewlett-Packard | 16 million |
| /** By LnRouter.app */ | |
| function bitShift(n: number, shiftBy: number): number { | |
| let base = n; | |
| for (let i = 0; i < shiftBy; i++) { | |
| base = base * 2; | |
| } | |
| return base; | |
| } | |
| export function shortChannelIdToDecimalId(shortChannelId: string): string { |
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