ipyellow

DNS blacklist checker

3 policy-reviewed lists

Check one public IPv4 address against DroneBL, PSBL, and Blocklist.de without treating an unavailable provider as a clear result.

Three fixed A-record queries run concurrently with five-second deadlines. Results use the resolver's bounded cache and are rate-limited per connection.

Enter a public IPv4 addressListed, clear, unknown, and provider-error states are shown independently.

How to use a listing result

A DNSBL result is one provider's current reputation signal, not proof that an address is malicious. Confirm the provider's evidence, listing scope, timestamp, and removal instructions; never block or accuse someone based only on this page.

The fixed set includes providers whose published documentation permits public DNSBL use. Spamhaus is not queried because this app's public-resolver path does not satisfy its attributable-resolver or DQS requirements. IPv6 is not queried because coverage and query formats are not consistent across this set.

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