PacketNebula

Tools + answers for the people who keep things running

Your network questions, answered in seconds.

Free, fast, browser-based tools for sysadmins, developers and security folks. No accounts, no uploads, no tracking your inputs. Plus field guides that give you the answer first and the theory after.

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Official Cursor key art for Origin, showing the Origin cube mark and wordmark over a blurred hillside at dusk, from the Origin product page.

Dev

Cursor Origin: what the GitHub rival actually ships

Cursor opened its Origin git forge to all paid plans on 17 August, the day GitHub broke. What it does, what it is missing, and who holds your code now.

By Stéphane Cardon
Answer card stating that Google won a bankruptcy auction for the internal enterprise data of the defunct Spirit Airlines with a 10 million dollar bid, beating a 7.5 million dollar bid from Mercor, that the package covers about 100 million employee emails and 500 million Microsoft Teams messages, and that the approval hearing in the Southern District of New York moved to 9 September 2026 after the flight attendants union objected.

Dev

Google's $10M Spirit Airlines Data Buy Slips to September 9

Google won a bankruptcy auction for Spirit Airlines' internal emails and Teams history at $10 million. The cabin crew union objected, so approval slipped to 9 September.

 Product render of the Cerebras CS-4 rack on a grey studio background, a black cabinet with the Cerebras logo and three horizontal Wafer-Scale Backpack modules slid partway out of the left side, each showing dense rows of orange-tipped connectors, with power and liquid cooling hardware on the right.

Dev

Cerebras CS-4: 750 PFLOPS from an overclocked wafer

Cerebras' CS-4 packs three WSE-3 Turbo wafers into one rack for 750 PFLOPS. The die is unchanged. Here's what the 30x claim really measures, and what's missing.

 Answer card summarising Groq's $350 million Series A of 17 August 2026, reported at a $3.5 billion valuation, led by Disruptive with Nvidia planning to participate, five days after Groq became an Nvidia Cloud Partner.

Dev

Groq's $350M reset: from Nvidia rival to Nvidia partner

Groq closed a $350M Series A on 17 August, reportedly at $3.5B, with Nvidia joining the round. The LPU challenger now sells Nvidia capacity. What that changes.

 Answer card summarising the reported Stripe acquisition of OpenRouter for more than $7 billion on 16 August 2026, unconfirmed by either company, and OpenRouter's published pricing of no inference markup with a 5.5% fee on credit top ups.

Dev

Stripe's $7B OpenRouter deal: what changes for your keys

Bloomberg says Stripe finalised a deal to buy OpenRouter for over $7B. Nothing is confirmed and nothing changed on your API keys. What Stripe is really buying.

 Answer card: the 50 percent weekly usage limits promotion in Claude Code ends at 11:59 PM PT on 19 August 2026 for Pro, Max and Team plans, returning weekly limits to standard levels, which removes a third of the headroom rather than half, with no change to plans, billing or the 5 hour session window.

Dev

Claude Code weekly limits drop a third after August 19

The +50% weekly limits promotion in Claude Code ends at 11:59 PM PT on 19 August 2026. That is a third off your headroom, not half. What changes, what does not.

 Anthropic announcement illustration for the Claude text watermarking post: an ornate quill pen resting across a detailed engraved hand, on a muted heather background.

Dev

Claude's text watermark: no opt-out, and no detector yet

Anthropic marks every Claude output with a SynthID style watermark. Global, no opt-out, weakest on code and short text, and the public detector has not shipped.

Flagship tools

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Security

Password Generator

Cryptographically secure passwords and passphrases, with real crack-time estimates.

Runs in your browser

Network

IPv4 Subnet Calculator

CIDR, masks, ranges and subnet splitting with a visual map of the address space.

Runs in your browser

Dev

JWT Decoder

Decode and inspect JSON Web Tokens locally, with expiry timeline and signature check.

Runs in your browser

Dev

Cron Expression Builder

Build cron schedules with buttons, see the next 10 runs instantly.

Runs in your browser

Network

DNS Lookup

Every record for a domain, plus a zone health read that flags missing MX, SPF, DMARC and CAA.

Security

SSL Certificate Checker

Expiry countdown, chain details, protocol and SAN list for any HTTPS host.

By category

Developer tools

Decode, build and debug faster: JWT, cron, encodings and more.

Network tools

Subnets, DNS, IPs: the daily bread of network admins, done right.

Security tools

Passwords, TLS certificates and the things that keep you off incident calls.

Email & DNS tools

SPF, DKIM, MX and the plumbing behind deliverability.

SEO tools

Technical SEO checks that actually move rankings.

Sysadmin tools

Converters, calculators and cheats for people who run servers.