> DNS Toolbox DNS, email, and network diagnostics for sysadmins.

email reputation

Blacklist Checker

Run an on-demand ViewDNS.info spam blacklist check for an IPv4 address or domain. Domain checks use the current A record IP.

ViewDNS connected Token required IPv4 and domains No local logging

Unlock is stored only in this browser session.

Interpretation note Blacklist results are reputation signals. Stop abuse and verify SPF, DKIM, DMARC, rDNS, SMTP banner, and mail logs before requesting delisting.