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Compare resolver and authoritative DNS answers

Observe DNS queries issued by a Windows computer

View DNS answers on a global resolver map

Discover domain-related hosts and DNS infrastructure

Google's DNS, mail and browser troubleshooting toolbox

A DNS command-line client with several encrypted transports

A self-hosted DNS sinkhole for network-wide filtering

Explicit DNS queries over plain and encrypted transports

Graphical OpenVPN client with DNS and scripting controls

Compare domain answers across public DNS resolvers

Look up mail routing and investigate server DNS

A configurable DNS filter for devices and networks

Query DNS records from lists with resolver and wildcard controls

Script DNS capture, parsing and replay pipelines

Look up domain registration, DNS and history

Research relationships among domains, addresses and DNS providers

A public DNS resolver with malicious-domain blocking

Retrieve domain records through a Windows graphical interface

Inspect a public IP and related network records

Look up African Internet number resources

Cloud DNS filtering with content and reporting controls

Look up current domain registration through RDAP

Check endpoint and job health, then turn failed checks into incidents and status-page updates.

Check websites, endpoints, ports, DNS, and scheduled heartbeats, then send alerts when checks fail.