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

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