Network

8 free online Network tools — fast, private and browser-based. No signup, no limits.

Subnet Calculator — Calculate network address, broadcast, usable hosts and subnet mask from IP/CIDR
IP Address to Binary — Convert IPv4 addresses to binary octets and binary back to IP
URL Builder — Construct URLs from protocol, hostname, path, query parameters and hash
Query String Parser — Parse URL query strings into a key/value table and rebuild them
MIME Type Finder — Find MIME types for any file extension from a searchable database
HTTP Header Builder — Build HTTP request headers from a list of common options and copy them
Common Ports Reference — Searchable reference of 55+ common TCP/UDP ports with service names
MAC Address Generator — Generate random MAC addresses in various formats with bulk output