Pick the tool by the config job
Server and site config keeps asking the same four questions. Web Config Ops is the Tools.Town cluster for answering them without a CLI or a cheat-sheet tab.
| Question | Tool |
|---|---|
| ”What’s the network and host range for this /27?” | Subnet Calculator |
| ”What octal mode is rwxr-xr-x?” | Chmod Calculator |
| ”What does 422 mean, and should I return 409 instead?” | HTTP Status Code Lookup |
| ”How many rem is 18px at root 16?“ | px ↔ rem Converter |
Subnetting: CIDR without the bit math
Paste an IPv4 address and prefix into the Subnet Calculator to get mask, network, broadcast, wildcard, and usable host range — ready for firewall rules and VPC blocks. Planning capacity? Start with Size a Subnet for a Small Office or VPC. Validate inputs first with the IP Address Validator.
Permissions: build modes visually
The Chmod Calculator turns rwx checkboxes into octal and symbolic modes, and decodes octal back into flags. The eternal question — 755 vs 644, which and when — has a short answer and a guide. Broken uploads after a migration? Follow Fix WordPress File Permissions. Looking up plugins, PHP, or salts? That is WordPress.org Ops, not chmod.
HTTP: return the right status
Mid-incident, the difference between 409, 422, and 503 matters. The HTTP Status Code Lookup covers 100–599 with a searchable table and guidance per code. Designing an API? Work through Pick the Right HTTP Status for an API, and inspect live responses with the HTTP Header Inspector.
CSS units: px ↔ rem at any root
Design specs quote px; accessible CSS prefers rem. The px ↔ rem Converter converts both directions at any root font size. Building a whole scale, not one value? Use the Type Scale Generator.
Related clusters
- Auth and tokens (JWT, hashes, passwords) live in the Dev Auth cluster — start at the JWT Decoder.
- Protecting a folder after fixing permissions? .htpasswd Generator.