Free IT tools

Troubleshoot DNS, email, and connectivity problems faster.

Run practical diagnostics for the issues IT teams hit every day: unreachable hosts, DNS lookup problems, open ports, mail server misconfiguration, blacklist checks, and domain intelligence.

Run Ping Check Mail Server Inspect Domain
Network diagnostics Ping, DNS lookup, traceroute, port checks, WHOIS, and IP research. Email diagnostics MX tests, mailbox checks, POP3/IMAP tests, and blacklist lookups. Need automation too? Use the DNS API when troubleshooting should become a repeatable workflow.

Black Lists
Check IPv4 against major DNSBL providers (MXToolbox-style blacklist agents).
Your current IP: Use my IP

How to use Black Lists checker
Enter an IPv4, hostname, or domain. For a domain, the checker resolves A and MX targets and tests their IPv4 addresses across major DNSBL providers.
Results show Listed, Not listed, or Unavailable per provider. Unavailable usually means timeout, provider-side policy, or retired zone.
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