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Dynamic DNS keeps an A record pointed at a host whose IP address changes. Rather than logging in to update the record by hand every time your ISP rotates your address, your device (or a cron job) sends a tiny request to cPanel and the A record updates automatically. Open it from cPanel home → Domains → Dynamic DNS.
Dynamic DNS page with the create form and the list of dynamic hostnames

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When to use it

  • A camera, NAS, or game server at home that you want to reach by name (home.mybrand.com) instead of memorizing the current IP.
  • A development box on a residential ISP whose IP rotates.
  • A field device behind a 4G router with a public IP that’s stable for a while but not forever.
If your IP is genuinely static (a colocated server, an EC2 elastic IP), you don’t need this. Just create a regular A record in the Zone Editor.

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Create a dynamic hostname

1

Pick the domain

The dropdown lists every domain on the account. Choose the one the dynamic name lives under.
2

Type the subdomain prefix

For home.mybrand.com, type home. cPanel auto-appends the domain.
3

Add a description (optional)

Free-form text. Useful when you have several dynamic entries and want to remember which one is the camera and which is the NAS.
4

Click Create

cPanel generates a unique URL the device uses to update the record. Copy it before you leave the page.
Dynamic DNS update URL after creation
The update URL looks like this: 
https://your-cpanel-username:dynamic-key@your-server/dynamicdns/update?id=...
It contains your cPanel username and a one-off update key. Treat it like a password.

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Configure the device or script

A dynamic DNS entry only updates when something tells it to. Three common ways:

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A router with built-in DDNS

Most modern routers (FRITZ!Box, Mikrotik, ASUS, OpenWrt, pfSense) have a Dynamic DNS section. Pick Custom as the provider and paste the cPanel update URL. The router fires the update on boot and whenever it detects a WAN IP change.

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A cron job on a Linux box

If the device that needs the dynamic name is itself a Linux machine, a one-line cron is enough. 
*/5 * * * * curl -fsS "https://USER:KEY@cpanel.yourdomain.com:2083/dynamicdns/update?id=ID" >/dev/null
Replace USER, KEY, and ID with the values from the Dynamic DNS page. */5 * * * * runs every five minutes, which is fine for most home setups.

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ddclient

The classic Linux DDNS client. It supports the cPanel protocol out of the box. 
# /etc/ddclient.conf
protocol=cpanel
server=cpanel.yourdomain.com
ssl=yes
login=cpanel-username
password='dynamic-key'
home.mybrand.com
Run ddclient -daemon=300 to update every five minutes.

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Manage existing entries

The list at the bottom of the page shows every dynamic hostname on the account, the current IP, the last update timestamp, and a Manage dropdown.
  • View update URL. Re-open the URL if you’ve lost it. cPanel shows it again on demand.
  • Reset key. Generate a new update URL. The old one stops working immediately. Use this if a device that knows the old URL has been compromised or decommissioned.
  • Edit description. Change the free-form description. The hostname itself can’t be edited; remove and re-create if you need to change it.
  • Delete. Drop the dynamic entry. The A record is removed too. The hostname stops resolving.

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Common issues

Open the update URL manually in a browser, or curl it from the device. cPanel returns a short status line. If it says good or nochg, the request reached the server. If you get an auth error, the URL has an old key, regenerate it.
CGNAT (carrier-grade NAT) hides your real public IP behind a shared one. Dynamic DNS will still register something, but it’s not reachable from the internet. Ask your ISP for a public IPv4 (often a paid add-on) or switch to an IPv6-only setup with an AAAA record.
The cPanel Dynamic DNS protocol updates A (IPv4) records only. For dual-stack, add an AAAA record manually in the Zone Editor or use a separate IPv6 DDNS client.
It isn’t, the URL contains a one-off update key, not your cPanel password. Still, treat the URL as a secret. If a device that knows it is decommissioned, Reset key so the old URL can’t update the record any more.

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