> For the complete documentation index, see [llms.txt](https://docs.sia.tech/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sia.tech/provide-storage/configuring-your-host/dynamic-dns.md). # Dynamic DNS Most ISPs assign dynamic IP addresses for their residential and small business accounts. Dynamic IPs can change over time. Dynamic IPs are more cost-effective, but they present a challenge for hosts which require consistent connectivity. In contrast, a static IP address remains fixed and does not change. It is manually assigned to a device or service, providing a stable point of contact for hosting purposes. Static IPs are typically used by large organizations, dedicated servers, or services that require constant accessibility. While static IPs offer reliable connectivity, they are generally more expensive than dynamic IPs. Dynamic DNS (DDNS) services help hosts with dynamic IP addresses. `hostd` has built-in DDNS and integrates with multiple services, including Cloudflare, AWS Route53, DuckDNS, and No-IP. With `hostd`'s built-in DDNS, hosts can use DDNS without downloading and setting up external software. ## Benefits of DDNS **Connectivity:** Dynamic DNS lets hosts with dynamic IP addresses stay connectable, even when their IP changes. DDNS services monitor and update the IP address associated with a domain name. When the IP changes, incoming traffic is redirected to the new IP. **Cost:** With dynamic DNS, hosts can avoid frequent IP announcements, which cost time, effort, and Siacoin. DDNS services update IP address information automatically, so hosts don't have to manage it manually. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.sia.tech/provide-storage/configuring-your-host/dynamic-dns.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.