# About Dynamic IP

> Dynamic IP keeps your DNS records and cloud firewall rules in sync with a changing public IP address.

Source: https://infranest.io/docs/dynamic-ip
Last updated: 2026-10-26

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Dynamic IP automatically updates your DNS records and cloud firewall rules whenever your public IP address changes — built for home connections, offices, and VPNs where the IP isn't fixed.

## Overview

- Home and office internet connections often get a new public IP without warning, which breaks DNS records and can lock you out of firewall rules that only allow your old IP.
- Dynamic IP solves both problems at once: it keeps your DNS A/AAAA records pointing at your current IP, and keeps your cloud firewall allow-rules pinned to it so remote access keeps working.
- You point your router, home lab, or office setup at one update URL, and InfraNest takes care of the rest — no extra software to install, since it uses the standard dyndns2 protocol that most routers and tools like ddclient already support.

## How it works

1. You create a Dynamic IP source, which gives you a secret update URL and token.
2. Your router (or a small script) calls that URL periodically. InfraNest reads the IP address the call is coming from.
3. If the IP has changed, InfraNest updates every DNS record and firewall rule attached to that source, logs the change, and can alert you. If the IP hasn't changed, nothing happens.

> [!NOTE]
Because Dynamic IP uses the standard dyndns2 protocol, most routers and tools work with just the update URL and token — there's nothing to install.

## Check what happened, and when

1. Open the Dynamic IP you want to check.
2. Go to the History tab.
3. Review the list of changes: every time the address changed, which records and firewall rules were updated, anything that failed to update, and who changed the source's settings.

> [!TIP]
If something that used to work suddenly stops — like remote access or a site not resolving — check the History tab first. It usually shows you exactly what changed and when.

## Tips

- Every DNS record and firewall rule kept up to date by a Dynamic IP links back to it, and so does any server sitting behind one of those firewall rules — so you can always trace what depends on a given Dynamic IP source.

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