DroneBL
IPv4 and IPv6 DNSBL focused on compromised and abusive hosts; replies are category-coded.
RBL Check for Mail Servers
Trace a mail domain to its MX hosts and public addresses, or inspect a mail host/IP directly. Then query four documented email-relevant DNS blocklists and retain the evidence behind every result.
- MX-aware routing
- Exact DNS return codes
- PTR / FCrDNS context
- No email is sent
Run an RBL check
Result
- Discovered
- 0
- Listed
- 0
- No match
- 0
- Inconclusive
- 0
- DNS calls
- 0 / 12
Mail routing and addresses
| Priority | Mail host | Public address | Discovery evidence | RBL scope |
|---|
Per-server RBL matrix
No match means NXDOMAIN/NODATA from that provider—not a deliverability guarantee.
| Mail server / address | DroneBL | SpamCop SCBL | PSBL | blocklist.de |
|---|
PTR / FCrDNS context
FCrDNS is identity context, never an RBL verdict.
Detailed evidence
Authoritative response groups, TTL, timing, and exact A return values.
Mail-delivery guidance
Coverage and provider scope
A deliberately bounded set—not a claim to cover every reputation system.
SpamCop SCBL
IPv4 source list based on spam reports. SpamCop describes it as aggressive and time-sensitive.
PSBL
IPv4 passive spam blocklist. Verify any observed listing at the provider’s official site.
blocklist.de
IPv4 abuse-reporting list with category-specific 127.0.0.x response codes.
Mail-routing caveat: MX records identify inbound receivers, not necessarily the IPs a domain uses to send outbound mail. Use direct mode for a sender named in an SMTP rejection. For a single-IP-only view, Octetify’s IP Blacklist Check is the focused alternative.
Interpretation: Results are point-in-time DNS observations. No match applies only to a completed lookup in the four lists above; failures, conflicts, rate limits, unsupported families, and capped addresses remain inconclusive or untested.
Boundaries: Spamhaus and Barracuda are intentionally not queried because their public-lookup access and usage terms do not fit this shared endpoint. No safety score is calculated.
Privacy: The browser sends your target to Octetify’s same-origin DNS API. That service makes public DNS queries, so authoritative DNS and RBL operators can receive the queried domain or reversed-address name. The diagnostic uses no client storage, credentials, SMTP connection, or email transaction. Ordinary site analytics remain governed by the Privacy Policy.