--- title: "6-day and IP Address Certificates are Generally Available" url: https://daily.dev/posts/6-day-and-ip-address-certificates-are-generally-available-qkyqfpt3b source_url: https://letsencrypt.org/2026/01/15/6day-and-ip-general-availability type: article source: "Hacker News" published: 2026-01-16T17:08:58.441Z updated: 2026-01-16T17:09:15.547Z tags: ["security"] reading_time: 2 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # 6-day and IP Address Certificates are Generally Available **[Hacker News](https://daily.dev/sources/hn)** · 2 min read · 0 upvotes · 0 comments ## Summary Let's Encrypt now offers 6-day (160-hour) short-lived certificates and IP address certificates as generally available features. Short-lived certificates enhance security by reducing the vulnerability window from 90 days to just over 6 days when private keys are compromised, addressing the unreliability of traditional revocation mechanisms. These certificates are opt-in and require selecting the 'shortlived' profile in ACME clients. IP address certificates support both IPv4 and IPv6 authentication and must use the short-lived format due to the transient nature of IP addresses. Standard certificate lifetimes will transition from 90 to 45 days over the coming years. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Let’s Encrypt’s Six-Day Certificates Generally Available](https://daily.dev/posts/let-s-encrypt-s-six-day-certificates-generally-available-o9btvuidz) · Feisty Duck · 0 upvotes · 0 comments - [Blink and you'll miss them: 6-day certificates are here\!](https://daily.dev/posts/blink-and-you-ll-miss-them-6-day-certificates-are-here--bv9qdld1x) · Scott Helme · 2 upvotes · 0 comments - [Decreasing Certificate Lifetimes to 45 Days](https://daily.dev/posts/decreasing-certificate-lifetimes-to-45-days-hrhhx2saa) · Lobsters · 7 upvotes · 0 comments - [Upcoming Changes to Let’s Encrypt Certificates](https://daily.dev/posts/upcoming-changes-to-let-s-encrypt-certificates-uaictqhyk) · Hacker News · 1 upvotes · 0 comments - [From 398 Days to 47: Why Website Security Certificates Are Getting Shorter?](https://daily.dev/posts/from-398-days-to-47-why-website-security-certificates-are-getting-shorter--romldzze9) · Latest Hacking News · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security) [View this post on daily.dev](https://daily.dev/posts/6-day-and-ip-address-certificates-are-generally-available-qkyqfpt3b)