Codynet
Network tools that just answer the question.
DNS, RDAP, HTTP, TLS, and subnet investigations — deterministic, free, and your queries stay in your browser.
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 dataFeatured tools
Small by design, reusable under the hood.
DNS Lookup
Resolve common DNS record types with structured output.
Open toolDIG Lookup
Packet-level DNS queries with raw output, sections, flags, and TTLs.
Open toolNSLookup
Quick A, AAAA, CNAME, and NS checks in a familiar flow.
Open toolMX Lookup
Inspect mail exchanger records and priorities.
Open toolTXT Lookup
Review SPF, DKIM, verification, and other text records.
Open toolReverse DNS (PTR)
Resolve an IP back to its hostname via PTR records.
Open toolGuides
Plain-English explanations behind the tools.
DNS Records Explained
A practical guide to A, AAAA, CNAME, MX, TXT, NS, CAA, and other DNS record types.
Read guideMX Records And Email Routing
How mail exchanger records decide where domain email is delivered and how to troubleshoot them.
Read guideSPF, DKIM, And DMARC Explained
A domain owner's guide to the DNS records that help receivers trust email.
Read guideTLS Certificate Expiration And Troubleshooting
How to inspect certificate dates, names, issuers, and trust problems before users see errors.
Read guideNXDOMAIN vs SERVFAIL: What DNS Errors Actually Mean
What 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 guideRDAP vs WHOIS: What Replaced WHOIS And Why
WHOIS is a 40-year-old plaintext protocol. RDAP returns the same data as structured JSON over HTTPS. Here's what each one is and when to use which.
Read guide