Free IP, DNS and network tools, with plain-English guides that explain what the results mean. No signup, no ads, and lookups aren't stored.
🔍 IP & privacy What Is My IP · VPN Leak Test · IP Reputation · Bulk IP Lookup · Port Scanner · Privacy Exposure Score
🌐 Network diagnostics DNS Checker · WHOIS Lookup · Ping Test · Speed Test · Subnet Calculator · Email Header Analyzer
🛠️ Utilities Encoding & hashing · Password tools
📚 Learn Guides · Scam Test · Data-broker opt-out directory · Books
How the tools are built
- Every result comes from a real query or measurement — nothing is guessed or padded.
- Each tool says what it can't tell you, not just what it can.
- Where a check needs a server (IP lookup, blacklist check, port scan), the result is returned and not kept.
Open source here
- dnsbl-check — a DNS blacklist checker that doesn't report refused queries as listings, timeouts as clean, or dead lists at all.
- doh-compare — asks Google and Cloudflare the same DNS question over DoH and tells real differences from quoting, ordering and GeoDNS noise.
- webrtc-leak-check — WebRTC IP leak detection without the false alarms: ignores mDNS and private addresses, compares per IP family. Live demo
- rdap-lookup — readable WHOIS for domains and IPs over RDAP; tells "not registered" apart from "this TLD has no RDAP".
- email-auth-headers — explains SPF, DKIM and DMARC from raw email headers without flagging legitimate newsletters as suspicious.
- password-tools — honest strength estimates, crypto-random generators with the EFF wordlist, and a private Have I Been Pwned check.
- subnet-calc — IPv4 subnet arithmetic with
/0,/31,/32and mask edge cases done properly, tested against Python'sipaddress.
Every repo has an offline test suite running in CI, and each tool is live, free and signup-free on the site.