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All check types
Network & Protocols

DNSBL / Blacklist Monitoring

DNSBL monitoring queries spam blocklists for your IPs and domains from clean-reputation probe addresses — so mail deliverability problems alert as events, not as silent drops.

Know when your IP lands on a blocklist before deliverability dies

What it checks

  • Listing status across major DNS blocklists
  • Delisting detection when entries clear
  • Reputation changes for mail-sending IPs and domains

Set it up

  1. 1Add a DNSBL monitor for your mail IP or domain
  2. 2Select the blocklists that matter for your traffic
  3. 3Alert into the channel your mail admin actually reads

FAQ

Why do probe IPs matter for DNSBL checks?

Blocklist operators rate-limit and ban shared query pools. Dedicated probe IPs with clean reputation get real answers instead of timeouts that look like 'not listed'.

Related check types

Ping MonitoringRaw reachability with real ICMP — not a TCP shortcutTCP Port MonitoringAny port, any protocol — answer the only question that mattersUDP MonitoringThe protocol nobody monitors until DNS or a game port dies

Start monitoring in minutes

External probes plus internal agents, escalation chains and status pages — free tier, no card required.

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