12+ Free Developer & Cybersecurity Tools

Network & DNS Diagnostic Hub

Free network utilities for administrators, developers and everyday troubleshooting. Provider coverage and request limits apply.

DNS & Domain Intelligence

Inspect domain records, compare two DNS resolvers, and review registration information.

Compare Google and Cloudflare DNS responses from the IPBulucu server.

Inspect A, AAAA, MX, TXT (SPF/DMARC), NS, CNAME, and SOA records instantly.

Lookup domain registrar, registration date, expiration date, and registry nameservers.

Inspect MX, SPF and direct DMARC record presence, including missing or duplicate records.

Public IP information, TCP reachability, DNS blocklists, and browser WebRTC address observations.

Look up public IPv4/IPv6, approximate location, ISP and ASN where the provider has data.

Check common TCP ports from the IPBulucu server. Refused connections and inconclusive timeouts are shown separately.

Query SpamCop and DroneBL; see unavailable sources and official lookup links.

Compare browser WebRTC address observations with your public IP. Empty results do not prove VPN privacy.

SSL certificate checks, HTTP header presence, subnet calculations, and browser-based hashes.

Verify TLS expiration dates, SSL issuer, SAN hostnames, and SHA-256 fingerprint.

Inspect HSTS, CSP, X-Frame-Options and other response headers. Policy correctness and overall security are not scored.

Calculate network address, broadcast address, netmask, wildcard mask, and usable host ranges.

Calculate SHA-1, SHA-256 and SHA-512 hashes in your browser.

CLI & Developer SDK Ready

Use the documented JSON endpoints in your scripts. Check SDK versions against the current API contract and request limits.