Free Uptime & Reliability Tools.

Look up the IPv4 addresses associated with any domain.

Look up the IPv6 addresses associated with any domain.

Look up canonical name (alias) records for domains.

Find the authoritative nameservers for a domain.

Perform a reverse DNS lookup to find the hostname of an IP.

Get Start of Authority records with zone configuration details.

Look up service records for VoIP, LDAP, and other services.

Retrieve text records used for verification and policies.

Check which CAs can issue SSL certs for a domain.

Verify Sender Policy Framework records to prevent email spoofing.

Check DMARC policies and reporting configuration.

Verify DomainKeys Identified Mail signatures.

Check when any domain expires and view registrar details.

Check SSL certificate expiry and view certificate details.

Check if an email address is from a disposable email provider.

Calculate how much downtime costs your business in lost revenue and productivity.

Validate any cron expression and see the next run times with a plain-English breakdown.

Calculate network details, split subnets, and convert IP ranges to CIDR notation.