Network & Security Utilities
Calculators, DNS lookup queries, security header checkers, password analyzers, and encryption decoders.
IPv4 Subnet Calculator
Calculate subnet mask, network/broadcast addresses, usable IP range, and host count bounds.
CIDR Calculator
Convert IP ranges to CIDR notation blocks and expand CIDR blocks to IP ranges.
DNS Lookup
Resolve public DNS records (A, AAAA, CNAME, TXT, NS, MX) using browser-compatible APIs.
MX Record Lookup
Target and query mail exchange (MX) servers for domain hostnames.
SPF Checker
Retrieve and validate SPF TXT records, identifying validation and format errors.
DMARC Generator
Visual wizard to construct valid DMARC policy txt records.
SSL Certificate Checker
Fetch and inspect public SSL certificate parameters (expiry, issuer, ciphers).
WHOIS Lookup
Lookup public domain WHOIS registration details and registry statuses.
HTTP Header Analyzer
Parse raw response header strings for redirect maps and configurations.
Security Header Checker
Audit domains for missing security headers (CSP, HSTS, XFO) and score compliance.
MAC Vendor Lookup
Resolve MAC address prefixes to registered hardware device manufacturers.
Port Number Lookup
Search ports assignments (0-65535) for standard network services protocols.
Uptime SLA Calculator
Calculate permissible downtime limits for SLA percentages (e.g. 99.99%).
Download Time Calculator
Compute file download duration under varying network bandwidth speeds.
Bandwidth Calculator
Translate transfer rates between standard metrics (bps, Kbps, Mbps, Gbps).
Password Entropy Calculator
Analyze password strength, characters variety, and bits of entropy score.
JWT Decoder
Decode and prettify JSON Web Token headers, payloads, and signatures.
Email Header Analyzer
Parse email source header blocks to audit delivery routes and trace delays.
Log Timestamp Converter
Batch convert Unix epoch timestamps to UTC and local calendar date formats.
Bytes Converter
Convert storage metrics between Bytes, KB, MB, GB, TB, PB decimal/binary formats.