Free security tools.
Small utilities designed to solve common defensive-security tasks quickly. Everything runs in your browser session; nothing is stored.
CIDR Checker
Check whether an IPv4 or IPv6 address belongs to a CIDR network.
→CIDR / Subnet Calculator
Expand a CIDR block: network, mask, broadcast, hosts and the first addresses.
→IOC Extractor
Paste logs or text and instantly extract IPs, hashes, domains, emails and URLs.
→IOC Deduplicator
Deduplicate and count a pasted list of indicators before importing into a SIEM.
→Hash Identifier
Identify common MD5, SHA-1, SHA-256 and SHA-512 values by length and syntax.
→Defang / Refang
Safely transform URLs and indicators for tickets, reports and chats.
→Timestamp Converter
Convert between epoch seconds/milliseconds and human-readable UTC/local time.
→IPv6 Subnet Calculator
Expand an IPv6 block: prefix, mask, first and last address, and total size.
→Base64 / Hex Converter
Decode or encode Base64 and hexadecimal payloads found in logs and samples.
→IOC Regex Tester
Extract IPs, hashes, domains and URLs from text with ready-made or custom regexes.
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