Networking
Networking utilities for checking DNS, subnets, ports, TLS certificates and latency without installing anything. Run lookups and conversions in your browser where possible, with clear results you can act on. No account is needed.
DNS Lookup
A, MX, NS, TXT & more records
Subnet / CIDR Calculator
Network, broadcast, hosts & mask
IP Address Converter
Decimal, binary, hex & octal
IPv6 Compress / Expand
Compress, expand & validate IPv6
Well-known Ports Lookup
Common TCP/UDP ports & services
Curl Command Builder
Copy-ready curl for shell & PowerShell
Ping / Latency Test
Round-trip time & jitter from your browser
Internet Speed Test
Download, upload & latency
WebSocket Tester
Connect & exchange messages live
SSL Certificate Checker
Issuer, expiry & chain for any domain
Whois Lookup
Registrar, dates & name servers
HTTP Header Checker
Status, security headers & score
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