Best Network & IP Tools
A hand-checked list of the best free network & ip tools for developers. Every tool runs in your browser — no upload, no login, no API key.
13 tools
Subnet Calculator
Network & IP
Calculate network, broadcast, host range, and mask from an IPv4 CIDR.
CIDR Range Expander
Network & IP
Expand a CIDR block into individual addresses, or compress a range into CIDR blocks.
IP Converter
Network & IP
Convert IPv4 to decimal/hex/binary, and expand or compress IPv6.
URL Parser
Network & IP
Break a URL into protocol, host, port, path, query, and hash.
Query String Converter
Network & IP
Convert between URL query strings and JSON, with nested bracket support.
User Agent Parser
Network & IP
Parse a user-agent string into browser, engine, OS, and device type.
HTTP Status Codes
Network & IP
Searchable reference of HTTP status codes with meaning and usage guidance.
MAC Address Tools
Network & IP
Validate and reformat MAC addresses, and look up the OUI vendor prefix.
Port Number Lookup
Network & IP
Search well-known TCP/UDP ports and their services.
HTTP Headers Explainer
Network & IP
Look up common HTTP headers and explain pasted raw headers.
DNS Record Types Reference
Network & IP
Searchable reference of DNS record types with examples.
IPv6 Expander/Compressor
Network & IP
Expand an IPv6 address to full form or compress it to shorthand.
MIME Type Lookup
Network & IP
Search file extensions and their MIME types.