Networking Tools

IP and Subnet Calculator, CORS Tester, .htaccess Generator and HTTP Status Codes

Tools for networks and HTTP. Work out subnets, look up IP details, check DNS, build and read HTTP headers, debug CORS and cache-control, generate redirects and .htaccess rules, and parse user agent strings. They're handy for debugging a site or a home network.

44 tools tagged Networking

.htaccess Generator

Build an Apache .htaccess from toggles for HTTPS, caching, headers and more.

Cache-Control Header Builder

Build a Cache-Control header and see exactly how browsers and CDNs will treat it.

Certificate Chain Order Checker

Check your SSL certificate bundle is complete and in the right order.

Certificate Expiry Calculator

See days left and the renewal date for any PEM certificate.

CORS Tester

Test a URL for CORS headers or analyse pasted ones.

CSR Decoder

Decode a CSR, verify its signature and spot problems before submitting.

CURL Converter

Turn a curl command into code in 24 languages.

Data Usage Calculator

Estimate data used per hour, day and month for streaming, calls and browsing.

DNS Lookup

Query any DNS record for a domain with TTLs and explanations.

Download Time Calculator

Find how long a file takes to download at your connection speed.

Email DNS Record Checker

Check an SPF, DKIM or DMARC record before you publish it.

Firewall Rule Explainer

Explain iptables and ufw rules in plain English and flag risky ones.

Homograph Checker

Detect lookalike domains that swap letters to imitate real brands.

Hostname / Device Name Generator

Hostnames like kestrel, basalt and web-prod-03 for servers, laptops and home lab boxes.

HSTS Preload Checker

Check a Strict-Transport-Security header against the HSTS preload rules.

HTTP Header Inspector

Parse pasted HTTP headers, explain each one and audit security.

HTTP Status Codes

Look up what any HTTP status code actually means.

HTTP Status Codes

Every IANA-registered HTTP status code with its RFC.

IANA Media Types

The full IANA MIME type registry with common file extensions.

IP Address Info

Classify any IPv4 or IPv6 address and see its every form.

IP Allowlist Builder

Turn a list of IPs into allow or block rules for your server.

IP Range To CIDR Converter

Turn start and end IP addresses into the fewest CIDR blocks.

IP Subnet Calculator

Network, broadcast, host range and counts for any subnet.

Link Unwrapper

Reveal the real destination behind Safe Links and tracking redirects.

 Updated

MAC Vendor Prefixes

Find the manufacturer behind a MAC address from the IEEE OUI registry.

MIME Type Lookup

Look up the MIME type for an extension, or the reverse.

Phishing URL Checker

Check a suspicious link for look-alike domains and phishing tricks.

Port Number Lookup

See what runs on a port and whether exposing it is risky.

Punycode Converter

Convert domains between Unicode and xn-- Punycode in both directions.

Redirect Generator

Turn an old-to-new URL list into 301 rules for Apache, Nginx, Netlify and Vercel.

SameSite Cookie Tester

See when each cookie is sent cross-site under its SameSite setting.

Security Headers Checker

Check pasted response headers for missing, weak and leaky security headers.

Speed Of Light Calculator

How long light takes to travel a distance, or how far it goes.

SSH Key Fingerprint

Get ssh-keygen style SHA256 and MD5 fingerprints from any public key.

SSL Certificate Inspector

Decode a PEM certificate and check its dates, names and fingerprints.

Stream Bitrate Recommender

Pick a streaming bitrate and see the upload speed it needs.

TLS Cipher Suites

Every IANA TLS cipher suite with its code, parts and status.

Upload Time Calculator

See how long a file will take to upload at your connection speed.

URL Query Parser

Split a URL into a readable table of parameters.

User Agent Parser

See what browser and OS a User-Agent string claims to be.

Webhook Payload Viewer

Flatten any JSON webhook payload into searchable paths and values.

What Is My IP

See the public IP address every website sees when you connect.

Wi-Fi Network Name Generator

Funny, clever and plain Wi-Fi network names, every one under the 32-character SSID limit.

WiFi Password Generator

WPA2/WPA3 keys with no look-alike characters, easy to read aloud.