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About the Blacklist Checker

Queries well-known DNS blacklists to see whether an IPv4 address or a domain is listed — the usual explanation when mail is being rejected or silently dropped. A domain is checked on the domain lists and its address on the IP lists.

• Seven IP blacklists and three domain lists in one query
• Shows which list flagged you and the reason it gives
• Delisting links for every list

Frequently asked questions

How do I get removed from a blacklist?

Fix the cause first — an open relay, a compromised account or a bad sending pattern — then use the operator's delisting form. Requesting removal without fixing the cause gets you relisted.

What does "refused the query" mean?

Some lists do not answer queries that come through large DNS resolvers. That is not a listing; check that list on its own website.

Related tools

• DNS LookupLook up DNS records for any domain: A, AAAA, MX, TXT, CNAME, NS, SOA and more. DNS lookup with instant results.
• Domain & IP LookupLook up everything about a domain or IP in one go: DNS records, Whois, geolocation, SSL and HTTP headers. Instant, no signup.
• DMARC CheckerCheck a domain's DMARC record and policy. See enforcement level, reporting addresses and alignment settings. Instant.
• MX Record LookupLook up the MX records for a domain to see which mail servers handle its email and in what priority order. Instant.
• SPF Record CheckerCheck and validate a domain's SPF record. See which servers may send mail, catch syntax errors and count DNS lookups. Instant.
• ASN LookupLook up any autonomous system number to see its operator, announced prefixes and peers. BGP and routing information.

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