DNS & Network Tools
Query live DNS resolvers and inspect public websites using bounded, SSRF-protected requests.
DNS Lookup
Query A, AAAA, MX, TXT and NS records from a live resolver.
DNS & NetworkA Record Lookup
Find IPv4 address records for a hostname.
DNS & NetworkAAAA Record Lookup
Find IPv6 address records for a hostname.
DNS & NetworkMX Record Lookup
Inspect mail exchanger priorities and destinations.
DNS & NetworkTXT Record Lookup
Read published text records such as SPF policies.
DNS & NetworkNS Record Lookup
Find authoritative nameserver records.
DNS & NetworkCNAME Lookup
Read canonical-name aliases.
DNS & NetworkSOA Record Lookup
Inspect zone authority, serial and timing values.
DNS & NetworkPTR Record Lookup
Resolve a public IP address to its reverse DNS name.
DNS & NetworkDNS Propagation Checker
Compare answers from Cloudflare and Google DNS over HTTPS.
DNS & NetworkIP Address Lookup
Retrieve public IP registration data from RDAP.
DNS & NetworkIPv4 Validator
Validate four-octet IPv4 syntax without a network request.
DNS & NetworkIPv6 Validator
Validate compressed and expanded IPv6 syntax locally.
DNS & NetworkCIDR Calculator
Calculate an IPv4 CIDR network, mask and range.
DNS & NetworkSubnet Calculator
Calculate IPv4 network and broadcast addresses.
DNS & NetworkReverse DNS Lookup
Query live PTR records for a public IP address.
DNS & NetworkHTTP Header Checker
Inspect response headers from a public HTTPS URL.
DNS & NetworkSSL Certificate Checker
Inspect the verified TLS certificate and validity dates.
DNS & NetworkWebsite Response Time Checker
Measure one server-side request, including connection time.
DNS & NetworkDomain WHOIS/RDAP Lookup
Retrieve domain registration information through RDAP.
DNS & NetworkSecurity Headers Checker
Inspect security headers returned by one public HTTPS request from this server. Header presence alone does not establish security.
DNS & NetworkWebsite Technology Hints
Inspect HTML and response headers for explicit CMS, library and analytics signatures. Results are hints and can be absent or misleading.
DNS & NetworkWebsite Availability Checker
Check the HTTP response from this server only. Timeouts and blocked targets are reported as errors; this does not establish a global outage.
DNS & NetworkEmail Authentication DNS Checker
Query real TXT records for SPF, DMARC and an entered DKIM selector using the configured Cloudflare resolver. Policy presence is not a deliverability or cryptographic verification result.
DNS & NetworkChoose the right dns & network tool
Each utility lists its accepted inputs, working example and result limitations. Start with the task you need, then use the related utilities to check or transform its output.
Frequently used in this category
- DNS Lookup — Query A, AAAA, MX, TXT and NS records from a live resolver.
Frequently asked questions
What does the propagation check actually measure?
It queries Cloudflare and Google public DNS resolvers and labels their returned answers. Two resolver observations cannot establish worldwide propagation.
Which websites can be checked?
Website diagnostics accept public HTTPS destinations on port 443. Private, loopback and reserved addresses are blocked, including redirect destinations.