Tools

Free tools for IT and email security.

Quick checks you can run without signing up.

DMARC, SPF, and DKIM Checker →
Check a domain’s email authentication and see what to fix.
DNS Lookup →
Look up A, MX, TXT, NS, and other records, or the reverse DNS of an IP.
IP Subnet Calculator →
Work out the network, mask, and host range for IPv4 and IPv6.
OID Lookup →
Find out what a certificate or SNMP object identifier means.

Want someone watching your email domain for you? See DMARC monitoring and a sample report.