Network tools

IPs, MACs, user agents, status codes. kodilo has 12 free Network tools, including IPv4 Subnet Calculator, IPv4 Range Expander, IPv6 ULA Generator and MAC Address Generator, and more. Every tool runs entirely in your browser, with no sign-up and no data sent to a server.

• IPv4 Subnet CalculatorCalculate subnet ranges, masks and host counts.
• IPv4 Range ExpanderExpand an IPv4 range or CIDR into individual addresses.
• IPv6 ULA GeneratorGenerate a unique local IPv6 address prefix.
• MAC Address GeneratorGenerate random MAC addresses.
• MAC Address LookupLook up the vendor for a MAC address.
• User Agent ParserParse a User-Agent string into browser, engine and OS.
• HTTP Status CodesLook up the meaning of an HTTP status code.
• Phone Parser & FormatterParse and format international phone numbers.
• URL ParserSplit a URL into its parts and edit query parameters.
• HTTP Headers & Cookie ParserPaste raw request or response headers to see each one explained, with Cache-Control, CSP and Set-Cookie decoded and common mistakes flagged.
• CIDR Aggregator & SplitterMerge IPv4 addresses, ranges and CIDRs into the smallest CIDR list, subtract exclusions, or split a network into equal subnets.
• HAR ViewerOpen a .har capture to see a waterfall, sortable requests, headers, cookies and bodies, and export a sanitized copy.