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Unbound — DNS resolver (Open Source)

Unbound is an open-source DNS resolver solution from NLnet Labs. Review its features and licensing on FreeSoftwareX — by features, licensing and price — and request a quote or demo free in 2026.

What is Unbound?

Unbound is open source — its source code is publicly available and free to use, modify and self-host, usually with an active community and no licensing fees. It is categorised under DNS resolver and published by NLnet Labs. Buyers typically evaluate Unbound when they need a dependable DNS resolver option and want to weigh the trade-offs between free, open-source and paid tools before committing.

Frequently asked questions

Is Unbound free?
Yes. Unbound is open source and free to use, with no purchase cost for the core product.
What type of software is Unbound?
Unbound is an open-source DNS resolver tool developed by NLnet Labs.

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