Network Tools

19 tools

Network and system utilities

Network and system tools — calculate subnet addresses and host ranges from CIDR notation, compute Unix chmod permissions with a visual bit grid, and look up HTTP status codes.

19 tools

CIDR Calculator

Calculate network address, broadcast, subnet mask, host range, and usable hosts from a CIDR block.

chmod Calculator

Convert between octal chmod values and symbolic permission strings. Supports setuid (4xxx), setgid (2xxx), and sticky bit (1xxx).

HTTP Status Codes

Look up the meaning, description, and RFC reference for any HTTP status code.

MAC Address Generator

Generate random MAC addresses with configurable format, unicast/multicast, and optional prefix.

CORS Header Generator

Generate CORS headers for nginx, Apache, Express, FastAPI, Django, and raw HTTP headers.

User-Agent Parser

Parse a User-Agent string to extract browser, engine, OS, device, and CPU information.

IP Address Converter

Convert IP addresses between dot-decimal, decimal, hex, binary, and IPv6 expanded/compressed formats.

DNS Record Generator

Generate BIND-format DNS zone file records: A, AAAA, CNAME, MX, TXT (with SPF), DMARC, NS, and SOA.

CSP Header Generator

Build a Content-Security-Policy header interactively: default-src, script-src, style-src, img-src, and more. Outputs raw header, nginx, and Express.

DNS Lookup

Look up live A, AAAA, CNAME, MX, TXT, NS, SOA, and SRV records for any domain, or enter an IP address for a reverse (PTR) lookup, against your choice of resolver.

IP Address & Geolocation Lookup

Look up any IPv4/IPv6 address, or your own public IP, and see its country, region, city, ISP, and ASN. Real-time query, not a generator.

DNS Propagation Checker

Check whether a DNS change has propagated across 34 named public resolvers in 24 countries, live and shown by name.

Website Health Checker

Check any URL for SEO, PageSpeed, security, HTTP headers, and DNS issues with one complete website health check and report.

SSL/TLS Checker

Connect live to any domain and check its real SSL/TLS certificate: chain, expiry, SANs, TLS version, and cipher.

SEO Checker

Fetch a live page and check its real title, meta description, canonical, robots.txt, sitemap, headings, Open Graph, schema, and links.

Security Headers Checker

Connect live to any URL and check its real HTTP security headers: HSTS, CSP, X-Frame-Options, cross-origin isolation, cookie flags, and information-disclosure headers.

Redirect Checker

Trace the real HTTP redirect chain for any URL: every hop, its status code, response time, redirect loops, and HTTPS downgrades.

HTTP Header Checker

Connect live to any URL and check its real response headers: Cache-Control, compression, ETag/Last-Modified validators, and CDN fingerprinting.

Website Security Scanner

Scan any live URL for mixed content, exposed .git/.env files, outdated JS libraries, missing Subresource Integrity, and HTTPS enforcement.