IT-NetworkDeveloper Tools
Network checks and developer tools in one section. Domain, mail, and website tests sit with the developer utilities. Each tool keeps its current address.
Start with the network tools when a domain, a mail server, or a website misbehaves. DNS Lookup and WHOIS Lookup describe the domain. MX Record Lookup and the Blacklist / RBL Checker are the usual pair for mail. SSL Certificate Checker and HTTP Header Checker describe the website. Ping Tool and Port Checker test whether a host answers.
The developer tools format, test, and generate the pieces developers handle: minified files, patterns, tokens, hashes, identifiers, and schedules. Password Generator is listed here and with Text Tools. JSON Formatter is listed with the developer tools and with Text Tools.
IT-Network Tools
Find My IP Address
Shows the public address a connection uses.
MX Record Lookup
Finds the servers that receive mail for a domain.
Blacklist / RBL Checker
Checks whether an address appears on DNS blacklists.
DNS Lookup
Shows the records a domain publishes.
WHOIS Lookup
Shows who registered a domain and when it expires.
SSL Certificate Checker
Reports a certificate's expiry, issuer, and chain.
HTTP Header Checker
Shows status codes, redirects, and security headers.
Port Checker
Tests whether a service port is open, closed, or filtered.
Ping Tool
Tests whether a host answers.
IP to Geolocation
Estimates where an address is registered.
Subnet Calculator
Divides an IPv4 range into networks.
Password Generator
Produces strong passwords. Also listed with Text Tools.
Developer Tools
QR Code Generator
Makes a scannable code.
URL Slug Generator
Turns a title into a clean web address.
JSON Formatter / Validator
Checks and formats JSON. Also listed with Text Tools.
Regex Tester
Highlights matches as a pattern is written.
CSS Minifier
Removes what a browser does not need from a style sheet.
JS Minifier
Removes what a browser does not need from a script.
HTML Minifier
Removes what a browser does not need from a page.
Cron Expression Builder
Writes a schedule and lists the next run times.
UUID Generator
Produces unique identifiers.
Hash Generator (MD5/SHA)
Creates MD5 and SHA fingerprints.
JWT Decoder
Reads a signed token.
HTTP Status Code Reference
Explains the codes a server can return.