Is nsupdate.info free to use?

Yes. According to the site itself, nsupdate.info is a free service, and it states that it will not annoy you with ads or spam. The homepage also describes the project as free and open-source software, so there is no paid tier mentioned and no pricing information is presented on the page. If you want to support it, the site asks for donations and for spreading the word, but that is optional rather than a requirement for use.

What "free" covers on nsupdate.info

Based on the information available on the site:

• No cost to use the service — the homepage explicitly calls it "a free service."
• No advertising — the site says it won't annoy you with ads.
• No spam — the same statement covers spam.
• Open source — nsupdate.info is described as free and open-source software, with the project hosted on GitHub.

The site does not list any subscription plans, premium features, or payment platforms on the page, so there is no evidence of a paid tier being offered there.

How the project is sustained

Because there is no charge, the site relies on voluntary support. The homepage includes a "You like us?" section that asks visitors to:

• Donate — a donation link is referenced in the footer.
• Spread the word — sharing the project with others is suggested as another way to help.

These are requests, not conditions of use. Nothing on the page indicates that donating unlocks features or that non-donors are limited.

What the service actually does

nsupdate.info describes itself as "the Dynamic DNS service you waited for." Dynamic DNS (DDNS) keeps a hostname pointed at an IP address that changes over time, which is useful when your ISP assigns you a new address periodically.

The homepage shows the visitor's current connection details as an example of the kind of data the service works with:

That display illustrates the core idea: the service sees your current IP and can associate a name with it, updating the record when the address changes.

Self-hosting as an alternative

Because nsupdate.info is open-source software, you have a second option beyond using the hosted service: run it yourself. The site points to the project on GitHub, and notes that it is built with Python and Django. Self-hosting means you would cover your own server and domain costs, but the software itself carries no license fee based on the description given.

Practical points to keep in mind

• Free does not automatically mean unlimited or guaranteed. The page does not state usage limits, uptime commitments, or retention policies, so treat those as unspecified rather than promised.
• Donations keep it running. If the service is useful to you, the site's own suggestion is to donate or share it.
• Check the documentation for setup details. The navigation includes Home, About, Documentation, Sign up, and Log in, so account creation and configuration steps live behind those pages rather than on the homepage.
• JavaScript is required for some functionality. The site notes that some features need JavaScript enabled in your browser.

In short: nsupdate.info is free to use, ad-free, and open source, with donations as the suggested way to support it. If you need a dynamic DNS hostname and prefer not to pay, it fits that use case — just confirm current limits and setup steps in its documentation before relying on it.