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.arpa, rDNS and a few magical ICMP hacks

https://sdomi.pl/weblog/24-arpa-hacks/

53•caminanteblanco•18h ago

Comments

possiblelion•14h ago

super interesting. the early days of military networks always fascinate me, especially the legacy holdovers like .arpa

ectospheno•13h ago

Between resolver.arpa, ipv4only.arpa, and the fact that your email won't be delivered to anywhere you actually care about without in-addr.arpa I'm not sure I'd call it legacy.

caminanteblanco•12h ago

I didn't even realize that half of the parts of the stack mentioned here existed. I'm going through the process of setting up a home server, and this is definitely giving me some ideas for nonsense to implement.

anonymousiam•11h ago

Reverse delegation (RFC 2317) is the way IP-to-FQDN lookups are usually done now. Before this was popular, you could get your ISP to defer to your DNS for reverse records directly, versus them using a set of individual PTR records.

Even though the RFC was written in 1998, it took a while for it to catch on. For years, my DNS servers were using both methods.

Both methods make use of the .in-addr.arpa "domain" syntax.

ranger_danger•7h ago

> Reverse delegation (RFC 2317) is the way IP-to-FQDN lookups are usually done now

> Before this was popular, you could get your ISP to defer to your DNS for reverse records directly

I'm not actually seeing the difference between these two... besides this new "reverse delegation" allowing different nameservers for prefixes longer than /24... aren't you still relying on your ISP/upstream provider (if you don't own your own IPs) to delegate reverse lookups to your own DNS server either way?

Visopsys: OS maintained by a single developer since 1997

https://visopsys.org/

215•kome•6h ago•34 comments

Pomelli

https://blog.google/technology/google-labs/pomelli/

101•birriel•5h ago•30 comments

How I use every Claude Code feature

https://blog.sshh.io/p/how-i-use-every-claude-code-feature

106•sshh12•4h ago•30 comments

Claude Code can debug low-level cryptography

https://words.filippo.io/claude-debugging/

247•Bogdanp•9h ago•125 comments

Updated practice for review articles and position papers in ArXiv CS category

https://blog.arxiv.org/2025/10/31/attention-authors-updated-practice-for-review-articles-and-posi...

427•dw64•13h ago•198 comments

Anonymous credentials: rate-limit bots and agents without compromising privacy

https://blog.cloudflare.com/private-rate-limiting/

43•eleye•3h ago•14 comments

GHC now runs in the browser

https://discourse.haskell.org/t/ghc-now-runs-in-your-browser/13169

269•kaycebasques•12h ago•85 comments

Crossfire: High-performance lockless spsc/mpsc/mpmc channels for Rust

https://github.com/frostyplanet/crossfire-rs

11•0x1997•1h ago•0 comments

Show HN: Why write code if the LLM can just do the thing? (web app experiment)

https://github.com/samrolken/nokode

266•samrolken•10h ago•193 comments

3M Diskette Reference Manual (1983) [pdf]

https://retrocmp.de/fdd/diskette/3M_Diskette_Reference_Manual_May83.pdf

40•susam•5d ago•9 comments

Beginner-friendly, unofficial documentation for Helix text editor

https://helix-editor.vercel.app/start-here/basics/

107•Curiositry•9h ago•33 comments

SQLite concurrency and why you should care about it

https://jellyfin.org/posts/SQLite-locking/

271•HunOL•15h ago•115 comments

SailfishOS: A Linux-based European alternative to dominant mobile OSes

https://sailfishos.org/info/

201•ForHackernews•6h ago•83 comments

Automatically Translating C to Rust

https://cacm.acm.org/research/automatically-translating-c-to-rust/

15•FromTheArchives•1w ago•0 comments

The Smol Training Playbook: The Secrets to Building World-Class LLMs

https://huggingface.co/spaces/HuggingFaceTB/smol-training-playbook

153•kashifr•2d ago•8 comments

How to Build a Solar Powered Electric Oven

https://solar.lowtechmagazine.com/2025/10/how-to-build-a-solar-powered-electric-oven/

22•surprisetalk•1w ago•11 comments

A Few Words About Async

https://yoric.github.io/post/quite-a-few-words-about-async/

17•vinhnx•3h ago•0 comments

Sufficiently Smart Compiler

https://wiki.c2.com/?SufficientlySmartCompiler

3•coffeeaddict1•4d ago•0 comments

Why "everyone dies" gets AGI all wrong

https://bengoertzel.substack.com/p/why-everyone-dies-gets-agi-all-wrong

67•danans•3h ago•126 comments

The hardest program I've ever written (2015)

https://journal.stuffwithstuff.com/2015/09/08/the-hardest-program-ive-ever-written/

71•jacobedawson•3d ago•38 comments

OpenDesk by the Centre for Digital Sovereignty

https://www.opendesk.eu/en/product

40•athousandsteps•6h ago•4 comments

Hard Rust requirements from May onward

https://lists.debian.org/debian-devel/2025/10/msg00285.html

347•rkta•21h ago•614 comments

RegEx Crossword

https://jimbly.github.io/regex-crossword/

29•a022311•4d ago•11 comments

CharlotteOS – An Experimental Modern Operating System

https://github.com/charlotte-os/Catten

154•ementally•15h ago•77 comments

Chat Control proposal fails again after public opposition

https://andreafortuna.org/2025/11/01/chat-control-proposal-fails-again-after-massive-public-oppos...

473•speckx•11h ago•130 comments

Show HN: A simple drag and drop tool to document and label fuse boxes

https://github.com/alexadam/fuse-box-labels

9•eg312•1d ago•2 comments

Word2vec-style vector arithmetic on docs embeddings

https://technicalwriting.dev/embeddings/arithmetic/index.html

55•kaycebasques•9h ago•11 comments

Show HN: KeyLeak Detector – Scan websites for exposed API keys and secrets

https://github.com/Amal-David/keyleak-detector

16•amaldavid•5h ago•5 comments

I built my own CityMapper

https://asherfalcon.com/blog/posts/5

125•ashfn•5d ago•17 comments

Austria: Pylons as sculpture for public acceptance of expanding electrification

https://www.goodgoodgood.co/articles/austrian-power-giants-power-line-animals

101•Geekette•4d ago•46 comments