11 free tools · No account required
Free Network & Privacy Testing Tools
Investigate connection problems one question at a time: public IP details, browser latency, DNS records, or WebRTC exposure. Live checks contact the services identified on each tool page; certificate and configuration utilities explain what can be learned from supplied data.
Choose your tool
What's My IP & ISP Inspector
See the public address websites receive, inspect your network provider, and copy your IP in one click.
Open tool →DNS Lookup via DoH
Look up domain DNS records through a public DNS resolver. Inspect returned records and compare the result when troubleshooting domain configuration.
Open tool →WebRTC VPN & IP Leak Test
Compare your public IP with WebRTC candidates to check possible VPN IP exposure. No camera access needed. The test contacts IP lookup and STUN servers.
Open tool →Internet Speed Test
Measure download and upload speed in Mbps, plus HTTPS latency and jitter. See MB/s equivalents and compare your browser connection to Cloudflare.
Open tool →Global Ping & Latency Monitor
Test browser HTTPS latency and jitter with five probes or continuous monitoring. See failed requests in real time; this does not measure download speed or ICMP ping.
Open tool →IPv4 / CIDR Subnet Calculator
Calculate IPv4 network boundaries, masks, and host ranges locally. Explore the network and host bits with a live 32-bit visualizer.
Open tool →IP Address Format Converter
Convert dotted IPv4, hexadecimal, or an unsigned integer into seven copyable representations. No DNS lookup or connection is made.
Open tool →MAC to IPv6 & OUI Vendor Lookup
Normalize a MAC address, derive a modified EUI-64 link-local address, and check a small bundled vendor-prefix dictionary.
Open tool →Common Network Ports & Security Reference
Search a bundled IANA port reference by number or service, then review transport assignments and practical security guidance. This is not a port scanner.
Open tool →SSL / TLS Certificate Decoder
Inspect a public PEM certificate locally: subject, issuer, validity dates, SANs, signature algorithm, and public key details. Trust is not verified.
Open tool →Wi-Fi Signal & Stability Tester
Compare connection stability as you move between rooms using live latency, jitter and failed-request measurements. Browser-run testing with clear limits.
Open tool →
Which network & privacy tool should I use?
A slow or unstable connection
Compare latency and jitter with a speed test. Keep the device, connection and test endpoint consistent when comparing results.
VPN or browser privacy checks
Compare your public IP with WebRTC candidates. A single successful test cannot establish that every application uses the VPN.
Configuration troubleshooting
Use DNS, subnet and certificate tools for their specific inputs. Decoding a certificate is different from verifying a live server.