Developer and network tools that run entirely in your browser.

Simulate TTL hops, ICMP Time Exceeded replies, latency, and packet loss without touching the network.

Craft TCP headers and inspect one's complement Internet checksum math step by step.

Validate JSON, locate syntax errors, and browse deeply nested objects in a collapsible tree.

Convert CIDR prefixes into binary masks, host ranges, broadcast addresses, and subnet blocks.

Inspect DNS record structure and TTL behavior through a client-side educational resolver model.

Calculate Ethernet CRC-32 values, inspect FCS byte order, and validate captured frame trailers.

Find practical tcpdump, tshark, dumpcap, and udpdump commands for packet capture scenarios.

Encode text, decode Base64, inspect bytes, and compare UTF-8 output in the browser.

Decode JWT headers and payloads locally while highlighting algorithm and expiration claims.

Translate cron expressions into clear schedules with next-run previews and field validation.

Test regular expressions against sample text with capture groups, flags, and quick references.

Generate passwords, salts, and entropy estimates locally with the Web Crypto API.