Tools
21 free tools for network and security engineers. No account required.
Subnet Calculator
Tool · Network
IPv4 and IPv6 subnetting — host range, subnet-router anycast, /64 count, canonical form
DNS & Network SuperTool
Tool · Network
DNS records, SPF, DMARC, DKIM, WHOIS, HTTP headers, ASN, blacklist check and more
WHOIS Lookup
Tool · Network
Domain and IP registration data over RDAP, any TLD that publishes a service
IP Geolocation
Tool · Network
Country, city, ISP, ASN, coordinates, timezone — includes your own IP
Port Scanner
Tool · Network
TCP connect scan — check open ports on any host with presets or custom lists
Ping
Tool · Network
Test host reachability and round-trip latency with 4 probes
MAC Address Lookup
Tool · Network
Identify network device manufacturer from any MAC address via OUI database
SSL Checker
Tool · Security
Certificate details, expiry date, issuer, and chain validity for any domain
HTTP Headers
Tool · Security
Inspect response headers and security settings for any URL
Password Generator
Tool · Security
Cryptographically secure passwords with configurable length and character sets
Hash Generator
Tool · Security
SHA-1, SHA-256, SHA-384, SHA-512 hash of any text input
Email Header Analyzer
Tool · Security
Delivery path, SPF/DKIM/DMARC and whether they align with the From
JWT Decoder
Tool · Security
Decode and inspect JSON Web Token header, payload, and signature
CVE Lookup
Tool · Security
Search and read CVE details from the NVD vulnerability database
IP Reputation
Tool · Security
Abuse score, proxy/Tor/hosting detection flags for any IP
Sigma Rule Builder
Tool · Security
Build a Sigma detection rule and catch what converts cleanly and never matches
YARA Rule Tester
Tool · Security
Parse a YARA rule, test its strings against a sample, and catch the modifier traps
Log Parser
Tool · Security
Normalise syslog, CEF, LEEF, JSON, CSV, Apache or Cisco IOS log to columns — and name every assumption
PQC Size Impact Calculator
Tool · Security
How many bytes ML-KEM and ML-DSA add to a handshake and a certificate chain — and whether it still fits your MTU
Decoder Chains
Tool · Security
Unwrap nested base64, hex, URL, gzip and UTF-16LE layer by layer — and know when to stop
Base64
Tool · Security
Encode and decode Base64 strings instantly in the browser