🌐 Domain & Network
DNS lookups, IP geolocation, domain brainstorming, WHOIS/RDAP queries, SSL certificate checks, URL parsing, port reference tables, SPF/DMARC record generators, and redirect chain analysis. Everything you need to diagnose, configure, and understand the infrastructure that connects the web.
🌐 Punycode Converter
Convert internationalized domain names (IDN) to Punycode and back. Translate Unicode domains to ACE form (xn--) for DNS lookups.
📦 PCAP Viewer
View and analyze PCAP / PCAPNG packet capture files online — packet list, protocol decode, conversations, and filters.
🔒 SSL Certificate Checker
Check SSL/TLS certificate details for any domain — HTTPS, HSTS, redirect, TLS grade
🔗 Redirect Chain Checker
Trace URL redirects — see the full redirect chain from start to final destination
CIDR / Subnet Calculator
Calculate IPv4 subnet details from CIDR notation: network address, broadcast, mask, wildcard, host range, usable hosts. Subnet list & VLSM split.
DNS Lookup
Look up DNS records for a domain — A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, SRV
DNS Record Composer
Build DNS zone files visually — compose A, AAAA, CNAME, MX, TXT, and SRV records with RFC validation and export to BIND, Route53, or Cloudflare
Domain Brainstorm
Describe your project. Get creative domain names. Check availability instantly via DNS.
HTTP Headers Checker
View HTTP response headers for any URL. Inspect security headers, copy all headers, copy as curl command.
IP Address Lookup
Geolocate IP addresses. Find country, city, ISP, and more.
IPv4 to IPv6 Converter
Convert IPv4 addresses to IPv6 notation: IPv4-mapped, 6to4, and Teredo formats.
IPv6 Address Expander & Compressor
Expand and compress IPv6 addresses. Convert between full notation and shorthand ::, validate, and get reverse DNS, URL-literal, and binary forms.
MAC Address Lookup
Find the manufacturer (OUI vendor) for any MAC address. Enter a MAC to see vendor, country, registry block, and locally-administered / multicast flags.
Port Checker
Check if TCP ports are open on a hostname or IP address — enter host:port and see which ports are reachable.
Port Reference
Searchable table of common TCP and UDP port numbers with service descriptions
SPF & DMARC Record Generator
Generate SPF and DMARC DNS records for email authentication, and test existing records for any domain
WHOIS Checker
Check domain registration, expiry, registrar, nameservers, and availability via RDAP