Blog
Tips, tutorials, and ideas for developers.
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DNS basics for people who just deployed something
A, CNAME and TXT records, TTL and propagation, explained by what they mean for the person who has a deployment and wants an address on it. No history, no theory beyond what you need to debug your own setup.
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A free subdomain with no signup, in one HTTP call
How to get an address like myapp.sitey.my with no account, no email, no API key to fetch first. The one request that does it, the owner token it returns, and every call you might make after that.
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A free custom subdomain for GitHub Pages
Put myapp.sitey.my on a GitHub Pages site instead of username.github.io. The CNAME value GitHub wants, the one call that creates it, where to enter the domain on GitHub, and how to confirm it before switching on HTTPS.
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How to pick a subdomain name that will be accepted
The exact rules a sitey subdomain name has to pass, taken from the code that checks it. Length, characters, hyphens, reserved words, blocked keywords, and what happens when the name is already taken.
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Give a link an address — redirect a subdomain to any URL, no server needed
How to make myapp.sitey.my send every visitor to a URL you choose with a 301 — a GitHub repo, a form, a profile — using a REDIRECT record. One request, no server of your own, the rules the target has to meet, and how to change it later.
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My subdomain does not connect. What to check, in order
A sitey subdomain that does not open is almost always one of six things. How to tell which with two dig commands and one curl, what sitey checks every night on its side, and what it will never do about it.
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What sitey is, and what it is not
A free subdomain for anything you have deployed, without buying a domain. What sitey does, what it refuses to do, how long a name is lent, and who runs it.
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How to put a free custom subdomain on a Vercel deployment
Give a Vercel project an address like myapp.sitey.my without buying a domain. One API call to claim the name, the CNAME value to use, the TXT record Vercel asks for, and the commands that confirm it is live.
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Let your AI agent create a subdomain (MCP support)
sitey speaks MCP. Claude Code, Claude Desktop, Cursor and any other MCP client can claim a free subdomain, point it at a deployment, add a TXT record and renew it, with no account and no key to fetch first.
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Sign-in has moved to Google
sitey now signs you in with a Google account. Every subdomain you registered is still there; only the way in has changed.