Free Network Tools
Explanation
Check the DNS health and configuration of a domain.
Explanation
Check if an IP address is listed in one or more blacklists.
Explanation
Lookup the MX records of a domain.
Explanation
Test if an email address is valid and accepting mail.
Explanation
Lookup location details about an IP address.
Explanation
Lookup the reverse DNS (PTR) record of an IP address.
Explanation
Lookup domain or IP WHOIS information.
Explanation
Ping a hostname or IP.
Explanation
Lookup the details (including expiration date) of a certificate.
Explanation
Test port forwarding on your router & firewall.
Explanation
Test if a server is affected by the Heartbleed bug.
Explanation
Test if a SIP server allows anonymous calls.
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