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DNSViz helps you inspect how a domain resolves and whether its DNSSEC authentication chain is working. Its graph maps the path from the DNS root toward the domain, shows DNS records and signatures, and flags detected configuration problems. The web service currently allows fresh analyses, but its maintenance notice says it cannot load historical analyses or save new ones to its database.
What DNSViz does—and what it does not do
The DNSViz project describes it as “a tool for visualizing the status of a DNS zone.” It was created to help people understand and troubleshoot DNSSEC deployment by showing a domain’s DNSSEC authentication chain and its resolution path through the DNS namespace, then listing detected errors. See the DNSViz home page.
DNSViz is a diagnostic tool, not a DNS host or a repair service. It reports behavior observed during an analysis; it does not change registrar settings, authoritative-server configuration, or records at your DNS provider. If the graph identifies a problem, you must make any required change at the system responsible for that configuration.
Check the current web-service limitation
The DNSViz home page currently says the service is in maintenance mode and lacks access to its back-end database. It can run new analyses, but cannot load historical analyses or save new ones to its database. That means you can use the web interface for a fresh check, but should not rely on it to retrieve an earlier result or retain a history there. Because service status can change, check the notice on the live site before depending on a particular capability.
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Run a fresh analysis of a domain
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Open dnsviz.net and enter the domain you want to inspect in the analysis form.
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Start the analysis and allow DNSViz to collect the DNS responses it needs. A fresh analysis reflects the DNS behavior available to the tool at that time.
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Inspect the visualization and its warnings or errors. Follow the authentication chain and resolution path rather than treating a single node or line color as a complete diagnosis.
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If you need a repeatable record, use the command-line suite to retain output locally; the web service’s current maintenance notice says new analyses are not saved to its database.
Read the DNSSEC graph without jumping to conclusions
The official DNSSEC visualization guide describes a graph built from zones, delegations, resource record sets (RRsets), DNSKEY and DS records, signatures, negative responses, and related DNSSEC data. A zone is grouped by its origin and labeled with the time it was last analyzed. RRsets appear as rounded rectangular nodes; common examples include SOA, A, AAAA, MX, and CNAME.
Follow the delegation and authentication chain
Delegation edges show how a child zone is connected to its parent and convey whether the delegation is secure, insecure, bogus, lame, or incomplete. In the documented legend, a secure delegation uses a solid blue line, a bogus one a dashed red line, and lame or incomplete states a dashed yellow line. An insecure delegation is not the same as a broken secure chain: it indicates that DNSSEC authentication is not being provided across that delegation. Use the graph’s full context and accompanying warning details to understand the state; do not diagnose from color alone.
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Inspect records, signatures, and warnings
RRset nodes show the records involved in resolution. DNSSEC-specific nodes and links include DNSKEY and DS records, RRSIG signatures, and denial-of-existence records such as NSEC or NSEC3. The guide also covers CDNSKEY and CDS RRsets and wildcard-related information. DNSKEY decorations can indicate details such as the SEP bit, revoke bit, and whether a key is treated as a trust anchor.
When DNSViz reports an error or warning, use it to locate the relevant zone, delegation, record set, or signature, then verify which party controls that item before changing anything. A graph can reveal where observed data fails to form the expected chain, but it does not by itself establish which provider setting should be changed.
Choose the web interface or local command-line workflow
DNSViz is also available as a command-line suite in the official project repository. The repository describes commands for collecting DNS query results, assessing them, and producing graphical or textual output. This route is better suited to workflows where you want to keep probe data or create repeatable outputs; it requires local installation and management of the project’s current dependencies.
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| Route | Useful when | Output or control | Trade-off |
|---|---|---|---|
| DNSViz web service | You need a fresh analysis without setting up local software. | Interactive DNSSEC visualization and reported errors. | Current maintenance notice says historical analyses are unavailable and new analyses are not saved to the database. |
| DNSViz command line | You want a local, repeatable workflow, including pre-deployment checks. | Repository documents saved JSON probe data, graphs in image or HTML form, and text output; commands can query recursive resolvers or authoritative servers. | You must install the suite and check current release, dependency, and command documentation. |
The repository documents five subcommands: probe gathers queries and responses, grok assesses collected results, graph produces visual output, print produces text, and query combines probing with textual output. Its examples also show analyses using recursive resolvers or authoritative servers and examining a domain with its ancestry. Consult the repository’s README and linked command documentation for current installation instructions and exact syntax; dependency and release details can change.
Use DNSViz before and after DNS changes
The project identifies pre-deployment testing as a use case. You can run an analysis before changing a live configuration, retain command-line probe output if you need a local record, and run another analysis after the change to inspect the resulting DNS behavior. A later result is a new observation, not a guarantee that every resolver or client will see identical data at the same moment.
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