RBL / DNSBL IP & Domain Checker
Query Spamhaus ZEN for a public IPv4 address or Spamhaus DBL for a domain while separating reputation results from DNSBL error codes.
The DNS query runs only on request. BAOI uses fixed zones and handles 127.255.255.x query errors separately from listing responses.
Use the tool
IPv4 addresses are checked against Spamhaus ZEN; domains against Spamhaus DBL. DNSBL query errors are shown separately and never treated as a listing.
Use the result with confidence
Recommended workflow
- Enter only the technical identifier required for checking an IP or domain against RBL/DNSBL lists.
- Run the lookup and distinguish observed facts from interpretation.
- Cross-check warnings with configuration, logs or a second source before acting.
What to verify
- Treat the answer as a point-in-time observation: DNS caches, TTLs and propagation can change what another resolver sees.
- Compare authoritative records with the configuration expected for the service before classifying an alert.
- After a DNS or security change, retest once propagation and cache expiry can reasonably have completed.
Questions about this tool
What does the result say about checking an IP or domain against RBL/DNSBL lists?
Treat it as a technical snapshot: DNS, reputation or HTTP-security data can change and should be interpreted with the service context.
Can one warning alone prove a compromise?
No. A warning identifies a condition to investigate; correlate it with logs, configuration and other independent evidence.
When should I run the check again?
Repeat it after DNS, certificate, firewall or web-server changes and whenever the result may have changed because of propagation or cache expiry.