Free Network Tools

DNS Check

DomainExample example.com

Explanation

Check the DNS health and configuration of a domain.

Blacklist Lookup

IPExample 198.51.100.1

Explanation

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

MX Lookup

DomainExample example.com

Explanation

Lookup the MX records of a domain.

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Email Test

EmailExample info@example.com

Explanation

Test if an email address is valid and accepting mail.

IP Location

IPExample 198.51.100.1

Explanation

Lookup location details about an IP address.

PTR Lookup

IPExample 198.51.100.1

Explanation

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

WHOIS

Domain / IPExample example.com or 198.51.100.1

Explanation

Lookup domain or IP WHOIS information.

Ping

Hostname / IPExample www.example.com or 198.51.100.1

Explanation

Ping a hostname or IP.

Certificate Lookup

HostnameExample www.example.com

Explanation

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

Port Test

Hostname / IPExample www.example.com or 198.51.100.1PortExample 80

Explanation

Test port forwarding on your router & firewall.

Heartbleed Test

Hostname / IPExample www.example.com or 198.51.100.1PortExample 443

Explanation

Test if a server is affected by the Heartbleed bug.

SIP Test

Hostname / IPExample www.example.com or 198.51.100.1Phone numberExample 0015417543010

Explanation

Test if a SIP server allows anonymous calls.