Networking Tools
Networking utilities for DNS, IPs, CIDR ranges and HTTP headers — fast lookups for everyday debugging.
Subnet Calculator
Calculate IPv4 subnets online for free. Enter a CIDR like 192.168.1.10/24 to get netmask, network, broadcast, host range and usable host count.
URL Parser
Parse URLs online — split any URL into scheme, host, port, path, query parameters and fragment, with copy buttons for each part. Free and private.
User-Agent Parser
Parse User-Agent strings online — identify browser, engine, OS, device type and CPU architecture from any UA string. Your own UA prefilled.
CORS Tester
Test CORS headers on any URL from your browser — send a real request, inspect the response headers, and see whether cross-origin reads are allowed, blocked or preflighted.
cURL to Code Converter
Convert cURL commands to code online — turn any curl command into fetch, axios, Python requests, Go, PHP or Rust code. Free, runs in your browser.