Utilities

Free online network & DNS tools

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Utilities

Free tools

Quick answers, no sign-up

The lookups we reach for most often when setting up a domain, moving a website, or tracking down a problem. They are free to use and run straight from this page.

WHOIS Lookup

Find out who registered a domain name or who an IP address is allocated to.

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DNS Lookup

Query DNS records from the public DNS server of your choice, or compare several at once.

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DNS Propagation

Check whether a DNS change has reached public DNS servers around the world.

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Email DNS Check

Check a domain's MX, SPF, DKIM and DMARC records in one report.

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SSL Certificate Checker

See who issued a site's certificate, when it expires and which names it covers.

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HTTP Header Check

View the status code, redirect chain and response headers of any URL.

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Port Check

Test whether a common port such as 443, 25 or 3306 is open on a host.

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What Is My IP

See the public IP address and browser details your connection presents to websites.

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Subnet Calculator

Work out the network, broadcast address, mask and host range of an IPv4 subnet.

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Password Generator

Create strong random passwords in your browser. Nothing is sent to our server.

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Encode & Format

Base64 and URL encode or decode text, and format or minify JSON, in your browser.

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