What is nsupdate.info?

Updated

nsupdate.info is a free dynamic DNS (DDNS) service that maps a hostname to an IP address that changes over time. It supports both IPv4 and IPv6 updates, is free and open-source software, and states that it won't show ads or send spam. It's a fit if you need a stable name for a machine on a dynamic connection — for example, a home server, a router, or a remote device you want to reach by name rather than by a changing IP.

What the service does

Dynamic DNS solves a simple problem: your ISP hands you an IP address that can change, but you want a fixed hostname that always points to your current address. nsupdate.info lets you register a hostname and update its DNS record whenever your IP changes.

From the site's own homepage, the service advertises:

  • Free — "www.nsupdate.info is a free service."
  • No ads or spam — "we won't annoy you with ads or spam."
  • IPv4 and IPv6 support — the homepage displays both your current IPv4 and IPv6 addresses and their reverse DNS, which reflects the record types the service works with.
  • Open source — "nsupdate.info is free and open-source software," with the project hosted on GitHub.
  • Built on Python and Django — the site describes itself as "Empowered by Python and Django."

How it fits into a typical setup

The usual pattern is:

  1. Sign up for an account on the site (the homepage links to Sign up and Log in).
  2. Create a hostname you want to keep pointed at your machine.
  3. Configure an update client on that machine — either a DDNS-capable router or a small script — to send your current IP to the service whenever it changes.
  4. Verify that the hostname resolves to your current address.

The homepage also shows your current IP and its reverse DNS as soon as you visit, which is a quick way to confirm what address the service sees from your connection.

Things to check before committing

  • Update mechanism and client support. The site has a Documentation section; check it for the exact update protocol and any client or router compatibility you need, since that determines how much manual scripting is required.
  • Account and hostname limits. The homepage doesn't state limits on the number of hostnames or update frequency, so confirm current terms in the documentation or after signing up.
  • Language. The interface is available in several languages, including English, German, Greek, French, Italian, and Hungarian, so you can pick one you read comfortably.
  • Sustainability. The project asks for donations ("Please donate") and for users to spread the word, which is worth noting if you're depending on it long-term.

When it's a good choice

Choose nsupdate.info if you want a no-cost, ad-free DDNS provider, you need IPv6 as well as IPv4, and you value being able to inspect or self-host open-source software. If you need guaranteed uptime SLAs, commercial support, or a provider with a large managed client ecosystem, a paid DDNS service may suit you better — the trade-off is cost and lock-in versus the flexibility and transparency of an open-source project.