Key capabilities
- Two public DoH resolvers and ten DNS record types
- Per-hop status, destination address, and timing
- Trust, hostname, validity, SAN, and chain audit
- Complete IPv4/IPv6 CIDR calculation and subnet splitting
Network Diagnostics Toolbox
A complete network workbench for developers and operators: query DNS records, inspect HTTP headers and redirect chains, audit SSL/TLS certificates, and calculate IPv4/IPv6 CIDR subnets.
Network diagnostics workbench
Five tools with one copyable, exportable diagnostic report
Public networks only
DNS record lookup
Query common and advanced records in parallel, switch public resolvers, and run IPv4/IPv6 reverse PTR lookups.
Record types
Select records and start a lookup
Query A, AAAA, MX, TXT, NS, SOA, CAA, SRV, CNAME, and PTR records together.
The server pins a validated public IP and limits rate, redirects, and connection time.
Diagnose DNS, redirects, headers, certificates, and subnets in one report
Use one public domain, URL, IP address, or CIDR as the starting point for five focused checks. Compare DNS resolvers, inspect raw response headers, trace every redirect, audit the certificate chain, and calculate IPv4 or IPv6 network ranges.
Useful for
- Validate domains, mail, and websites before launch
- Trace availability, caching, and redirect issues
- Plan dual-stack networks and verify IP membership
Frequently asked questions
What can I enter in the online network diagnostic tool?
Enter a public domain, HTTP or HTTPS URL, public IP address, or IPv4/IPv6 CIDR range. Private, loopback, and local targets are rejected.
Can it trace redirects and inspect an SSL certificate?
Yes. The report can show each redirect status, destination, timing, response headers, certificate names, validity dates, trust, SAN entries, and chain details.
Which checks run locally and which contact the network?
IP and CIDR calculations run in the browser. DNS, HTTP, redirect, and SSL checks contact the public target through the ToolRen service and do not retain the diagnostic input or result.
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