Every tool in this category is free — runs in your browser, files never leave your device.
Fetch and display your public IPv4 and IPv6 network addresses client-side
Web & NetworkQuery geolocation and ISP data client-side for any public IP address
Web & NetworkQuery and resolve hostnames or domains associated client-side with public IP addresses
Web & NetworkQuery and resolve host DNS records (A, AAAA, MX, CNAME, TXT) client-side using Cloudflare resolver APIs
Web & NetworkQuery PTR reverse pointer records client-side to translate IP addresses back to domain hostnames
Web & NetworkQuery and view mail exchange (MX) mail server records client-side using Cloudflare DNS resolver APIs
Web & NetworkQuery and view authoritative name server (NS) records client-side using Cloudflare DNS resolver APIs
Web & NetworkQuery and view text (TXT) configuration records client-side using Cloudflare DNS resolver APIs
Web & NetworkQuery, view, and audit Sender Policy Framework (SPF) email authorization records client-side
Web & NetworkQuery and verify DomainKeys Identified Mail (DKIM) verification keys client-side using selector targets
Web & NetworkQuery and analyze Domain-based Message Authentication (DMARC) alignment policies client-side
Web & NetworkQuery Certification Authority Authorization (CAA) records client-side to verify authorized SSL issuers
Web & NetworkMeasure network latency round-trip time (RTT) client-side using HTTP ping handshake checks
Web & NetworkSimulate network routing path hops client-side from your client to destination servers
Web & NetworkTest web server port availability client-side using socket latency check simulations
Web & NetworkResolve and scan active subdomains client-side using Cloudflare DNS resolver records
Web & NetworkDecode and inspect PEM-formatted SSL/TLS certificate fields client-side
Web & NetworkCalculate validity days remaining client-side based on certificate expiration timestamps
Web & NetworkInspect and audit security parameters of pasted HTTP response headers client-side
Web & NetworkLookup and analyze HTTP status codes client-side with response classifications
Web & NetworkTest and verify if target websites are down or active client-side using connection attempts
Web & NetworkSimulate and capture responsive viewports client-side inside device frame containers
Web & NetworkTest and measure your active internet download speed client-side in Mbps
Web & NetworkCalculate file transfer durations across multiple network bandwidth speeds client-side
Web & NetworkCalculate IP subnetting masks, network parameters, and host ranges client-side
Web & NetworkCompute Classless Inter-Domain Routing (CIDR) blocks, wildcard masks, and host counts client-side
Web & NetworkIdentify hardware device manufacturers client-side from MAC address Organizationally Unique Identifier (OUI) prefixes
Web & NetworkConvert standard IPv4 octets into binary representation formats client-side
Web & NetworkConvert standard IPv4 addresses into mapped IPv6 formats client-side
Web & NetworkResolve hostnames and domain names to active IPv4 addresses client-side
Web & NetworkScan and verify active client user agent headers, screen dimensions, and cookies status client-side
Web & NetworkInspect and parse active browser cookies client-side in a secure table layout
Web & NetworkDeconstruct raw email header outputs client-side to inspect hop paths and authentication flags
Web & NetworkTest and identify disposable, temporary email domains client-side from address inputs
Web & NetworkExpand shortened link paths client-side to inspect the final destination URL
Web & NetworkResolve domain names to active IPv4 and IPv6 addresses client-side
Web & NetworkQuery and resolve Autonomous System Number (ASN) details and network routes client-side
Web & NetworkScan domains or IPs against common DNSBL blocklist databases client-side using resolver APIs
Web & Network