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Dynu vs nsupdate.info: catalog facts
Dynu	nsupdate.info
Freemium Dynamic DNS is free; domains, email, SSL certificates and VPS hosting are paid.	Free The hosted service is free and the project is open source.
Web	Web
Free dynamic DNS tier Documented IP update protocol and API	Free dynamic DNS service Displays current public IP and reverse DNS
Many services beyond basic DDNS are paid Requires creating an account	Requires a network connection to update a hostname when its IP address changes.
Downloadable app, Hosted service	Web application, Self-hosted, Hosted service
Closed source	Open source
License not stated	License: BSD-3-Clause
Account 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.