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Analyzers, tools and references for people who run IT.

Drop an export and get findings. Paste an error and get the cause. Everything runs in your browser: no account, nothing uploaded, no tracking.

sysop@hub: ~

$

try

Something is broken

The server crawls, the PC shows a blue screen, the mail came back, the printer is silent.

linux-server-slowThe server is slow: eight steps to the cause.windows-pc-slowThe PC is slow: from Task Manager to the fix.stop-code-lookupWhat does this blue screen code mean?mailflow-debuggerWhy did the mail bounce? Paste the error.diagnoseNo network, no Wi-Fi, no printing, no sign-in.helpdesk-top-ticketsThe 20 tickets every helpdesk gets.

everything for fixing

Read this for me

Drop a file or paste some text and get it in plain words. Nothing is uploaded.

log-readerWho tried to get in, what failed, what repeats?smart-readerIs this disk dying, or is it the cable?certificate-decoderWhat is in this certificate, and why is it refused?firewall-rule-reviewerWhat do the firewall rules leave open?phish-analyzerIs this mail real? Drop the .eml.domain-checkCan someone send mail as your domain?

everything that reads files

Plan and build

Before you buy, cable or type the command.

small-office-blueprintThe network, the shopping list, the checklist.ip-plan-builderVLANs and subnets that do not overlap.backup-plannerHow much storage, how far back, what is missing?raid-calculatorUsable space and what may fail.command-builderrobocopy, rsync, tar, find: tick and copy.bash-powershell-side-by-sideYou know it in one, need it in the other.

all calculators and builders

Microsoft 365 and Entra

Turn the exports you already have into findings, each with the fix.

signin-analyzerIs someone already in? Drop the sign-in log.ca-analyzerWhat do the access policies really enforce?ca-policy-builderA baseline of policies, with a lockout check.app-auditWhich apps could take over the tenant?intune-analyzerHow healthy is the device fleet?license-optimizerWhich licences pay for nothing?

keep the results in your cockpit

by area

Network

Addresses, switches, Wi-Fi, firewalls, DNS and DHCP.

Linux and containers

Servers, services, logs, Docker and the shell.

Windows and Active Directory

Clients, servers, Group Policy, domain controllers.

Hardware

PCs, notebooks, servers, printers, plugs and racks, with drawings.

Mail and web

Delivery, SPF, DKIM and DMARC, certificates, domains.

Security

Incidents, phishing, backups, hardening, awareness.

Microsoft 365 and Entra

Sign-ins, Conditional Access, Intune, licences.

Databases

SQL, PostgreSQL, MySQL, SQL Server, backups.

Helpdesk

The tickets that come every week, and the questions to ask.

worth a look

start with this

Linux playground

A pretend server that has had a bad morning: the shop is down, a disk is full, and something odd sits in the uploads folder. Fix it with real commands, pipes and sudo, in your browser. Eighteen missions, from ls to finding out how the attacker got in.

Open the playground Or PowerShell, the same way

Small office blueprint

Say how many people and how they work. Get the network layout, a sized list of what to buy and the checklist that decides whether it is solid.

Open the blueprint builder

Network diagram builder

Place routers, switches and servers, connect them, label the links. The drawing is checked, lives in a link, and saves as SVG or PNG.

Open the builder interactive map

Attack map

23 techniques from first phish to ransomware. Switch on your controls and watch which routes stay open.

Open the map reader

Mail header reader

Paste the headers of an email. Get the route as a timeline, the wait at every hop, and why SPF, DKIM or DMARC failed, in plain words.

Open the reader

headlines

Security news from public feeds. All news

21 OctBleepingComputerJapan's Onamae Desktop Cloud hacked, up to 27,000 servers affected
21 OctDark ReadingTiDB Breach Exposes Flawed Cloud Security Assumptions
21 OctPalo Alto AdvisoriesCVE-2026-109618 Impact of Critical Vulnerabilities in PHP (CVE-2026-109618, CVE-2026-109619) on Palo Alto Networks Products (Severity: HIGH)
21 OctSANS ISCCritical PHP Vulnerability (CVE-2026-109618, CVE-2026-109619) [infocon yellow], (Wed, Oct 21st)PHP.net announced that it will release a critical update today. We decided to change the infoCon to YELLOW due to the widespread use of…
21 OctCisco TalosCompromised eMudhra intermediate certificatesCisco Talos is aware of eight intermediate certificates belonging to the intermediate certificate authority, eMudhra.
21 OctBleepingComputerLazarus hackers use post-quantum cryptography for malware delivery
21 OctThe RecordMeta on the spot for $25 billion under New Mexico privacy ruling
21 OctDark ReadingMarvell, Microsoft & Oracle Work to Standardize Data Center Hardware Security

exploited-now

Newest entries in the CISA catalog of exploited vulnerabilities. See all

new here