Network tools

IPv4 subnet calculator

Calculate the network, broadcast, usable address range and host count from an IPv4 address with a CIDR prefix or subnet mask.

URL parser and query editor

Inspect URL components and edit query parameters without losing repeated names, their order or the URL fragment.

IPv6 subnet calculator

Expand or compress an IPv6 address and calculate its CIDR network, final address and exact address count for prefixes 0–128.

DNS record lookup

Query DNS records with Cloudflare or Google and inspect TTLs, response codes and the resolver’s DNSSEC flag.

IP range to CIDR

Convert an inclusive IPv4 or IPv6 address range into the smallest set of CIDR blocks, with exact address counts.

VLSM subnet planner

Plan IPv4 subnets by host count, inspect usable ranges and free blocks, and export the allocations as CSV.

MAC address formatter

Convert MAC addresses between common formats, inspect address bits and generate locally administered unicast addresses.

Domain Punycode converter

Convert internationalized domain names between Unicode and ASCII, with per-line validation and CSV export.

HAR network viewer

Inspect HAR 1.2 requests, timings and headers locally, then export the complete filtered request list as CSV.

UTM campaign URL builder

Build campaign links with seven UTM fields while retaining other query parameters and URL fragments.