Tools for small servers, in the browser.
Build a crontab line, a short Nginx server block, or a subnet plan without pasting your setup into someone else's form. Nothing here phones home.
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Cron expression builder
Build or paste a five-field crontab line, get a plain-English explanation, and see the next run times.
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Minimal Nginx config
A copy-paste server block for a static site or a local reverse proxy, with optional TLS.
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CIDR / subnet calculator
Network, broadcast, usable hosts, binary masks, IPv6 prefixes, and IPv4 splits.
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SSL expiry checker Coming soon
A live check needs a tiny backend. For now, here is a safe openssl command you can run on the VPS.
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Why these tools
Small VPS machines fail in boring ways: a cron job that runs too often, an Nginx default that still talks HTTP, a Docker network that collides with the host. These pages are meant to be used at the desk, then copied onto the server. They are a first slice of a toolbox planned for tools.smallblackbing.uk.
Notes from the same operator, in Chinese, live at blog.smallblackbing.uk — including a maintenance list for a 1 GB machine.