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Duck DNS vs nsupdate.info: catalog facts
Duck DNS	nsupdate.info
Free Free to use; supported by donations through Patreon.	Free The hosted service is free and the project is open source.
Web	Web
No paid tiers Simple, documented update mechanism	Free dynamic DNS service Displays current public IP and reverse DNS
Limited to the service's own subdomains Few features beyond basic dynamic DNS	Requires a network connection to update a hostname when its IP address changes.
Hosted service	Web application, Self-hosted, Hosted service
Closed source	Open source
License not stated	License: BSD-3-Clause
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.