IP Blocklist Monitor — Spamhaus DNSBL Check

Spamhaus zen combines SBL, XBL, and PBL into one query zone while individual zones help delisting teams identify whether spam sources, exploit drones, or policy violations triggered listing. Mail operators monitoring egress IPs catch listings before customer deliverability collapses.

Our monitor runs live DNSBL queries — positive answers indicate listing at query time. Absence does not guarantee future cleanliness if compromise continues.

results array entries include zone hostname, human label, reversed query string, and listed boolean. SBL flags spam sources, XBL flags exploit drones and botnet activity, PBL flags policy violations on end-user space, zen aggregates all three.

listedZones lists labels for zones that returned positive — paste into delisting tickets with timestamps and remediation evidence.

When bounce messages cite your domain rather than numeric IP, enter the domain — we resolve A record IPv4 before Spamhaus queries. resolvedFrom documents mapping for ticket chain-of-custody.

Mail may egress from different IPs than web hosting — monitor each production egress explicitly.

Both call action spamhaus with identical JSON. spamhaus-lookup is the canonical tool page; ip-blocklist-monitor targets operators searching blocklist monitor terminology for scheduled operational checks.

malware-ip-checker includes Spamhaus among broader DNSBL sets — use this page when delisting requires knowing which Spamhaus zone listed you.

Spamhaus requires fixing root cause before removal — patch compromised hosts, stop spam egress, close open relays. Document listedZones and query timestamps in provider tickets.

Delisting latency varies by zone — zen listing may clear when underlying SBL XBL PBL entries clear individually.

Dense shared IPs accumulate listings from co-tenant abuse. neighbor-domains-lookup shows co-hosted sites when considering migration to dedicated egress.

Your domain may be operationally clean while IP is listed — investigate co-tenants and request provider migration.

GET /ip-tools/api/extended?action=spamhaus&query=8.8.8.8. Parse results, listed, listedZones, summary, note. Schedule weekly cron jobs on mail egress pools with brief caching.

note reminds that 127.255.255.254 style DNS responses indicate listing per Spamhaus documentation.

Check production mail egress weekly and immediately after deliverability incidents. Web origin IPs monthly unless abuse alerts spike.

Archive JSON exports with queriedAt equivalent from your scheduler for compliance evidence.

Monitor IPs and domains you own or manage. Blocklist queries are logged by some operators — avoid hammering the same address every second.

We do not permanently store monitor queries.