Network Tools
Troubleshooting connectivity? Check your public IP, ping a host, scan open ports, query WHOIS records, verify SSL certificates, or test WebSocket connections. Run network diagnostics without opening a terminal.
Network Tools
IP Address Lookup Tool
Free online IP address lookup tool. Instantly find your public IP address and geolocation info including country, city, and ISP.
LAN File Transfer
Free online LAN file transfer using WebRTC peer-to-peer sharing. Send files and text between devices on the same network without uploading to a server.
Port Check Tool
Free online port checker. Test open ports on any IP address or domain, run batch checks, and view response times in your browser.
Whois Lookup
Free online Whois domain lookup. Check registrar details, registration dates, expiration dates, DNS servers, and domain status for global TLDs.
SSL Certificate Checker
Free online SSL certificate checker. Verify SSL/TLS validity, expiration date, certificate chain, domain match, and HTTPS configuration issues.
Ping Test Tool
Free online ping test tool. Check server or domain connectivity, latency, packet loss, average response time, and min/max statistics.
Subnet Calculator
Free online IP subnet calculator with IPv4/IPv6 support. Compute network address, broadcast, mask, wildcard, host range, and CIDR — all in your browser.
WebSocket Test Tool
Free online WebSocket test tool. Send and receive messages with JSON formatting and real-time debugging. Local for privacy.
DNS Lookup Tool
Free online DNS lookup tool. Query A, AAAA, MX, TXT, NS, CNAME, and SOA records via DoH (DNS over HTTPS). Runs locally in your browser for privacy.
URL Expander
Free online URL expander. Unshorten bit.ly, t.cn, TinyURL links and more — see the real destination, the full redirect chain, status codes and timing.
What this category can do
Network tools diagnose addresses, domains and connections. They cover public IP lookup, LAN transfer, port checking, WHOIS, SSL certificates, ping and WebSocket testing. This category is for endpoint reachability and domain information, while security tools handle hashes, keys and tokens.
Most tools process input in the browser when possible. For files, tokens, documents or network checks, review the selected tool before using sensitive data.
Common use cases
- Check your public IP and whether a local service port is reachable before sharing it.
- Review WHOIS and SSL certificate details when a domain or HTTPS setup behaves unexpectedly.
- Test latency, WebSocket connectivity or local file transfer between devices on the same LAN.
FAQ
Why is a port closed if my app is running?
Firewalls, NAT, container binding, wrong listen address or ISP restrictions can block access.
Does ping prove a website works?
No. Ping only tests basic reachability when ICMP is allowed; HTTP, DNS or TLS can still fail.
Why is WHOIS owner information hidden?
Many registrars redact personal data for privacy or legal reasons.
What matters in an SSL check?
Look at expiry, hostname match, certificate chain and whether intermediate certificates are served correctly.
Related Categories
Security & Encryption
Encryption, hashing, and identity checks don't require server round-trips. Generate strong passwords, compute MD5 or SHA checksums for files, inspect JWT tokens, or encrypt with AES, DES, and RSA — all computed right in your browser tab.
Developer Tools
The small stuff that eats up a developer's day: looking up HTTP status codes, generating UUIDs, writing cron expressions, checking MIME types, parsing User-Agent strings, or scaffolding TypeScript types from JSON. Bookmark this page — it's faster than digging through docs.
Hardware Testing
Sticky key? Dead pixel? Mic not picking up? Before you buy a replacement, run a quick check. Test every key, verify your screen's refresh rate, confirm your camera and microphone work, or measure ambient noise with the decibel meter.
