Free tools

Tools for domains, DNS & uptime

Handy DNS, email, network and monitoring utilities — free, no signup required.

DNS & Email

See every common DNS record for a domain, and what they say together.

Check a domain’s mail servers — and whether mail can actually reach them.

Add a sender to your SPF record without breaking the one you have.

Check a domain’s SPF record and how close it is to the ten-lookup limit.

Read a domain’s mail setup and get the DMARC record it should publish next.

Check a domain’s DMARC policy and whether it actually protects anything.

Calculate network, broadcast, host range and usable hosts from a CIDR.

Turn an uptime SLA percentage into allowed downtime per day, month and year.

Check whether a website is up or down, right now, from the edge.

Verify a domain serves a valid, trusted HTTPS certificate.

In the dashboard these stop being one-off lookups: records watched, certificates tracked, and a message when something changes.

Free plan · No credit card required · Set up in minutes