Free Network Tools


DNS Check

Example example.com

Explanation

Check the DNS health and configuration of a domain.

Blacklist Lookup

Example 198.51.100.1

Explanation

Check if an IP address is listed in one or more blacklists.

MX Lookup

Example example.com

Explanation

Lookup the MX records of a domain.




Email Test

Example info@example.com

Explanation

Test if an email address is valid and accepting mail.

IP Location

Example 198.51.100.1

Explanation

Lookup location details about an IP address.

PTR Lookup

Example 198.51.100.1

Explanation

Lookup the reverse DNS (PTR) record of an IP address.



WHOIS

Example example.com or 198.51.100.1

Explanation

Lookup domain or IP WHOIS information.

Ping

Example www.example.com or 198.51.100.1

Explanation

Ping a hostname or IP.

Certificate Lookup

Example www.example.com

Explanation

Lookup the details (including expiration date) of a certificate.



Port Test

Example www.example.com or 198.51.100.1 Example 80

Explanation

Test port forwarding on your router & firewall.

Heartbleed Test

Example www.example.com or 198.51.100.1 Example 443

Explanation

Test if a server is affected by the Heartbleed bug.

SIP Test

Example www.example.com or 198.51.100.1 Example 0015417543010

Explanation

Test if a SIP server allows anonymous calls.