Network
Network tools: DNS, ping, reverse lookup, traceroute, speed test, whois, SSL check, HTTP/security headers and email check.
Connection Info
View your public IP address, user agent, browser language and platform.
Subnet Calculator
Calculate network address, broadcast, netmask and usable host range for a CIDR subnet.
IP Converter
Convert any IPv4 address to decimal, hexadecimal and binary online – free, no sign-up, handy for understanding IP notation and for developers.
DNS Checker
Look up DNS records for a domain — A, AAAA, MX, TXT, CNAME and more.
Ping
Check the reachability of any public host online – shows response time and packet loss, free with no installation or sign-up required.
Reverse Lookup
Resolve an IP address to its hostname (PTR) – or a hostname to its IP addresses (A/AAAA).
Traceroute
Trace the network path to a public host (hops + round-trip time).
Speed Test
Test your internet connection speed online for free – measures download, upload, latency and jitter in your browser, no app or account needed.
Whois Lookup
Query a domain's registration data (registrar, status, dates) – straight from the whois servers.
SSL Certificate Check
Inspect a host's TLS certificate chain: trust, validity, issuer and all intermediates.
HTTP Headers
Show the HTTP response headers of a URL (status, server, caching, cookies …). Does not follow redirects.
Security Header Check
Check and grade a page's security-relevant HTTP headers (CSP, HSTS, X-Frame-Options …).
DNS Propagation
Query the same DNS record from several public resolvers and check whether it matches everywhere (propagated).
Email Domain Check
Check a domain's email configuration: MX, SPF, DMARC, DKIM, MTA-STS, TLS-RPT, BIMI and DNSSEC - with a score and concrete recommendations.
Mail Header Analyzer
Paste raw e-mail headers and analyze them clearly: SPF/DKIM/DMARC result with failures highlighted, delivery route with per-hop delays and all fields - entirely in your browser, nothing is uploaded.