Network tools that just answer the question.
Codynet
Network tools that just answer the question.
DNS, RDAP, HTTP, TLS, and subnet investigations — deterministic, free, with no query retention.
No accounts. No query retention. Privacy-respecting analytics.
`$ query codynet.com MX status: ok records: priority: 10 exchange: mail.example.net $ rdap domain codynet.com source: HTTPS RDAP result: structured registration data`
Featured tools
Small by design, reusable under the hood.
DNS LookupResolve common DNS record types with structured output.Open toolDIG LookupPacket-level DNS queries with raw output, sections, flags, and TTLs.Open toolNSLookupQuick A, AAAA, CNAME, and NS checks in a familiar flow.Open toolMX LookupInspect mail exchanger records and priorities.Open toolTXT LookupReview SPF, DKIM, verification, and other text records.Open toolReverse DNS (PTR)Resolve an IP back to its hostname via PTR records.Open tool
Popular lookups: online nslookup tool, MX record lookup, online dig tool, TXT record lookup, reverse DNS (PTR) lookup, and DNS lookup.
Start with a workflow
Not sure which tool you need? Start from the job you're doing.
Debug DNS propagationRun the same record across Cloudflare, Google, and Quad9 to see who has the new answer yet.Compare resolversCheck a domain's email DNSConfirm MX routing, then read SPF, DKIM, and DMARC in the TXT records that authenticate mail.Check email DNSCheck TLS certificate healthInspect the certificate chain, expiry date, names, and trust before users hit an error.Inspect a certificateAudit HTTP security headersFollow redirects and review HSTS, CSP, and the other response headers that harden a site.Check headersLaunch or move a domainLearn which DNS records to set, then verify each one with the matching lookup tool.Read the guideAudit many names at onceRun any lookup over a list of domains or IPs and export the results as JSON or CSV.Run bulk lookups
Guides
Plain-English explanations behind the tools.
DNS Records ExplainedA practical guide to A, AAAA, CNAME, MX, TXT, NS, CAA, and other DNS record types.Read guideMX Records And Email RoutingHow mail exchanger (MX) records control email routing for a domain, and how to troubleshoot MX routing when mail delivery breaks.Read guideSPF, DKIM, And DMARC ExplainedA domain owner's guide to the DNS records that help receivers trust email.Read guideSPF Record Failing? How To Read It In DNSHow to find your SPF record in DNS, read every mechanism and qualifier, and fix the real failures: softfail to spam, the 10-lookup permerror, and duplicate records.Read guideTLS Certificate Expiration And TroubleshootingHow to inspect certificate dates, names, issuers, and trust problems before users see errors.Read guideNXDOMAIN vs SERVFAIL: What DNS Errors Actually MeanWhat is NXDOMAIN and what is SERVFAIL? NXDOMAIN means the DNS name does not exist; SERVFAIL means the resolver could not get a clean answer. Two different DNS errors, two different fixes.Read guide
Why Codynet is different
Built to answer one question fast, then get out of your way.
Deterministic answers
Lookups run against real DNS resolvers and HTTPS RDAP endpoints, and show you the raw, structured response — not a guess or a cached marketing page.
No query retention
Codynet runs your lookup and does not log or retain the values you search. Your history stays in your browser, and analytics are privacy-respecting.
Tools that connect
Results link straight into the next tool — an IP to its reverse DNS and owner, a host to its DNS and TLS — so an investigation flows without retyping.
Free and account-free
No sign-up, no paywall, no project setup. Open a tool, run the lookup, and copy or export what you need.