Free Network Tools

IP Address Location Lookup

Enter an IP address to instantly see country, city, region, ISP and coordinates on a map — find the location of your IP or any other IPv4/IPv6 address.

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Speed Test

Test your internet speed – measure download, upload and ping for free.

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Port Scanner

Scan open ports on your IP address – check which services are accessible from the outside.

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Blacklist Check

Check if your IP address is on spam blacklists – 18 active DNSBL databases with reason and delisting link.

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Whois Lookup

Query Whois information for domains and IP addresses – registrar, owner and nameservers.

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IPv6 Test

Test whether your internet connection supports IPv6 and if your IPv6 address is working correctly.

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SSL Check

Check the SSL/TLS certificate of a website – validity, issuer and encryption.

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HTTP Header Check Online

Inspect HTTP and security headers of any website — Content-Security-Policy, HSTS, X-Frame-Options, server info and caching at a glance.

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Email Authentication Check — SPF, DKIM & DMARC

Check whether your domain has a valid SPF, DKIM and DMARC setup. With an overall grade, concrete recommendations and copy-paste-ready DNS records — free, no signup.

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Subnet Calculator

Calculate IP subnets – netmask, broadcast, host range and CIDR notation.

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DNS Lookup

Query all DNS records of any domain – nameservers, A, AAAA, MX, TXT, CNAME and SOA records at a glance.

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DNS Propagation Check

Compare the authoritative nameservers against five public resolvers – including the TTL of each resolver.

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Reverse DNS Lookup

Check the PTR record and forward-confirmed rDNS – the prerequisite for large providers accepting your mail.

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What does this site know about you?

Full self-audit: what your browser, IP, device and network reveal to every website — IP location, hardware, screen, language, time zone, WebRTC leak, canvas fingerprint and more.

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