Reply Runway.
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Free blacklist checker

Check the listing.
Keep uncertainty visible.

Check a domain’s website IPv4 records or an outbound sending IPv4 address against named public blocklists. Free to use, with no sign-up or payment.

Checks SpamCop and DroneBL through Cloudflare’s public DNS resolver. The domain/IP is sent to those services; Reply Runway does not store the search. Private addresses and IPv6 are not supported.

For email reputation, enter the actual outbound sending IP. A domain lookup checks up to four website A records, which may belong to a CDN and may not be your email-sending addresses.

See each provider’s answer.

A listing, a confirmed non-listing, and an unavailable lookup are different results. This tool keeps them separate.

A lookup is one part of the picture.

Choose the actual sending IP

Use the IPv4 address your outbound email provider uses. A website hostname may resolve to a CDN rather than your mail server.

Read each list separately

SpamCop tracks reported email sources; DroneBL tracks abusive hosts and proxies. Provider control checks run before a non-listing is reported.

Investigate a listing

Use the named provider’s information and work with the sending provider. This checker does not remove listings or promise delivery.

Is the blacklist checker free?

Yes. No account or payment is needed. It checks the two named public DNS blocklists; it is not a paid or exhaustive reputation service.

What does Unavailable mean?

A control query failed, the resolver was restricted, an unknown response appeared, or a lookup timed out. No clean result is inferred from that state.

Can it check every blacklist?

No. Some lists require access keys or restrict public resolvers. Only the providers shown in the result were checked.

Domain and email setup guides How SpamCop DNS lookups work

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