GET https://dynupdate.no-ip.com/nic/update

If ports 80 and 443 are blocked, port 8245 is available.

This documentation is for the Dynamic DNS Integration API, a simple Dynamic DNS protocol which is separate from the No-IP API. If you're looking to update a hostname's IP address with the No-IP API, check the Replace Rdata documentation. Learn more about the differences between the No-IP API and the Dynamic DNS Integration API.

To dynamically update a hostname's IP address, send an HTTP request which performs the following:

Authenticates using a DDNS Key.
Provides a User Agent in the HTTP header.
Specfies the hostname and IP address with query parameters.

Authentication

Username/Password Basic Auth

Create a DDNS Key for a hostname (or a group of hostnames), then use the provided username/password with basic auth:

http://rv7sc9a:secretpassword@dynupdate.no-ip.com/nic/update?hostname=mytest.example.com&myip=192.0.2.25

Where rv7sc9a is the DDNS Key username and secretpassword is the DDNS key password which was generated.

Note: Account credentials can also be used, but this method is being phased out as we migrate to everyone using DDNS Keys for authenticating DDNS update clients.

Authorization Header

The Authorization header's value should be the base64 encoding of the DDNS key's username and password, separated by a colon: username:password.

GET /nic/update?hostname=mytest.example.com&myip=192.0.2.25 HTTP/1.1
Host: dynupdate.no-ip.com
Authorization: Basic base64-encoded-auth-string
User-Agent: Company DeviceName-Model/FirmwareVersionNumber maintainer- contact@example.com

Response

Note that Response content type is text/plain.

Text	Description
good IP_ADDRESS	DNS hostname update successful. Followed by a space and the IP address it was updated to.
nochg IP_ADDRESS	The IP address returned will be the IPv4 address, if an IPv4 is supplied. If IPv4 and IPv6 are both supplied, both ips will be returned in a comma separated list. If only an IPv6 address is supplied, an IPv6 address (only) will be returned. IP address is current, no update performed. Followed by a space and the IP address that it is currently set to. The IP address returned will be the IPv4 address if an IPv4 is supplied. If IPv4 and IPv6 are both supplied, both ips will be returned in a comma separated list. If only an IPv6 address is supplied, an IPv6 address (only) will be returned. Note: Excessive nochg responses may result in your client being blocked.
nohost	Hostname supplied does not exist under specified account, client exit and require user to enter new login credentials before performing an additional request.
badauth	Invalid username password combination.
badagent	Client disabled. Client should exit and not perform any more updates without user intervention. Note: You must use the recommended User-Agent format specified when Submitting an Update, failure to follow the format guidelines may result in your client being blocked.
!donator	An update request was sent, including a feature that is not available to that particular user such as offline options.
abuse	Username is blocked due to abuse. Either for not following our update specifications or disabled due to violation of the No-IP terms of service. Our terms of service can be viewed here. Client should stop sending updates.
911	A fatal error on our side such as a database outage. Retry the update no sooner than 30 minutes. A 500 HTTP error may also be returned in case of a fatal error on our system at which point you should also retry no sooner than 30 minutes.