Free Network & Developer Tools

Calculate IPv4 and IPv6 subnets, network ranges, broadcast addresses, and available hosts instantly.

Query A, AAAA, CNAME, MX, NS, TXT, and other DNS record types for any domain.

Inspect HTTP response headers and analyze security headers for any website URL.

Test website reachability, measure response times, and detect packet loss from our servers.

Look up domain registration details — registrar, creation date, expiry, nameservers, and DNSSEC status.

Verify SSL/TLS certificate validity, expiry date, issuer, and Subject Alternative Names.

Scan common ports on any host to check if they are open, closed, or filtered.

Trace the network path to any host and measure hop-by-hop latency.

Measure DNS lookup, TTFB, download time, and get a performance grade for any URL.

Check if an IP address or domain is listed on major DNS-based blacklists (DNSBLs).

Find the hostname associated with an IPv4 address using PTR record lookup.

Combine traceroute and ping — see per-hop latency, jitter, and packet loss in one report.

Look up geographic location, ISP, organization, and timezone for any IP address.

Convert between bandwidth units and estimate file download or upload transfer times.

Identify the manufacturer and view formatting details for any MAC address.

Encode special characters for safe URLs or decode percent-encoded strings instantly.

Pretty-print, validate, and minify JSON data online — with custom indentation.

Encode text to Base64 or decode Base64 strings, including URL-safe variants.

Complete HTTP status code reference — look up any response code from 1xx to 5xx.

Generate strong, cryptographically random passwords with customizable length and character sets.

Parse and explain cron expressions — see human-readable descriptions and next scheduled runs.

Test and debug regular expressions with real-time matching, highlighting, and group extraction.