Tools
Network toolbox
DNS, RDAP, HTTP, TLS, and subnet math — all in deterministic, browser-only persistence. Pick a tool to get started, or run several at once with bulk lookups.
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 toolDNS Resolver Comparison
Compare the same query across Cloudflare, Google, Quad9, OpenDNS, and custom resolvers.
Open toolDomain Whois / RDAP
Fetch domain registration data through HTTPS RDAP.
Open toolIP Registration Lookup
Find IP allocation and network registration data with RDAP.
Open toolHTTP Security Header Checker
Check status, redirect chains, and security headers (HSTS, CSP, COOP) for any URL.
Open toolTLS Certificate Checker
Check certificate chain, expiry, SANs, and trust status of any HTTPS endpoint.
Open toolSubnet & CIDR Calculator
IPv4 and IPv6 subnet / CIDR math: network, broadcast, mask, range, and host count.
Open toolBulk Lookups
Run any tool over a list of inputs and export the results.
Open tool