Alternatives to Zonemaster
An open-source DNS validation tool that checks a domain's delegation and zone for configuration errors. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Zonemaster
An open-source DNS validation tool that checks a domain's delegation and zone for configuration errors.
Replacements
Listings that take over the same core job as Zonemaster.
DNSViz
An open-source tool suite that visualizes DNS zones and the DNSSEC authentication chain.
DNSViz is also open source under GPL-2.0 and graphs the DNSSEC chain of trust, with a CLI for pre-deployment tests but less general delegation focus.
intoDNS
A free web tool that checks a domain's DNS and mail server health and configuration.
intoDNS is a free hosted report covering DNS and mail servers with fix suggestions, but is not open source and lacks DNSSEC visualization.
DNSsy
A free website that tests a domain's DNS health and offers live DNS, reverse, WHOIS and ping lookups.
DNSsy gives a free hosted DNS health report with live lookups and basic mail and web checks, in a plain, dated interface.
DNSSEC Debugger
A Verisign Labs web tool for diagnosing problems with DNSSEC-signed domain names and zones.
DNSSEC Debugger from Verisign Labs shows each step of the DNSSEC chain of trust, covering DNSSEC only and not general delegation.
Similar software
Related functionality, not a direct replacement.
DNSChecker
A web tool that checks DNS propagation by querying public resolvers in many countries.
Internet.nl
A web test that checks websites, mail domains and connections for modern Internet standards support.
ViewDNS.info
A web collection of more than 20 DNS, IP and domain lookup tools, with a paid API.
CAA Test
A web tool that checks the DNS CAA records published for a domain.
MXToolbox
A web-based suite of DNS, MX, SPF, DMARC and blacklist lookups for diagnosing email delivery.
whatsmydns.net
A free online tool that checks DNS propagation against nameservers in many countries.
