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Who is NLnet Labs?
NLnet Labs is a Netherlands-based nonprofit foundation that develops and maintains open source Internet infrastructure software, with a focus on DNS resolution, authoritative DNS, and routing security.
- Recursive and authoritative DNS software
- RPKI validation and routing security tooling
- Open source development under permissive licensing
- Implementation of Internet standards and protocols
- Research and development in network infrastructure
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More About NLnet Labs
NLnet Labs' offerings are positioned for network operators, Internet service providers, domain registries, and enterprises that operate their own DNS infrastructure. Its best-known software includes Unbound, a validating, recursive, caching DNS resolver, and NSD, an authoritative DNS name server. Both are deployed in production by operators that require standards-compliant name resolution and high query throughput.
The organization also develops Routinator, a relying party software package that validates Resource Public Key Infrastructure data for BGP route origin validation, and Krill, a certificate authority and publication server for RPKI. These tools address routing security in the global Internet routing system and are used by network operators implementing origin validation.
Architecturally, the DNS products implement protocols defined by the IETF, including DNSSEC for authentication of DNS data and encrypted transport options such as DNS over TLS and DNS over HTTPS. The RPKI tooling follows the RPKI architecture described in the IETF RFC series and uses the RPKI-to-Router protocol to distribute validated route origin data to routers.
In the DNS software category, Unbound and NSD are commonly evaluated alongside other open source resolvers and authoritative servers. Their relevance lies in independent implementation, careful standards conformance, and a development model that allows public review of code and design decisions.
Because these components sit within critical Internet infrastructure, their correctness, security, and maintenance carry significant operational weight for enterprises, network operators, and national registries. The nonprofit structure and open source distribution allow organizations to adopt and audit the software without vendor licensing dependencies.
Within enterprise IT categories, NLnet Labs maps most directly to DNS, DHCP, and IP address management software, with additional relevance to network security and open source infrastructure foundations. Its current solution areas include recursive and authoritative DNS, RPKI validation and certification, and related research in Internet protocols.
Our description of NLnet Labs. Updated October 2026.