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SiteCheck Web Intel – Spamhaus ZEN/DBL Blocklist Check
x402
SiteCheck Web Intel – Spamhaus ZEN/DBL Blocklist Check is a paid API for AI agents from api.webintel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-25).
Checks an IPv4 address against the Spamhaus ZEN blocklist or a domain against the Spamhaus Domain Block List (DBL), returning listed status, all matching return codes with their list meanings, and a Spamhaus lookup link.
Price / call$0.002
Success—
StatusUnknown
How this service works
Spamhaus blocklist check through Spamhaus's official Data Query Service: an IPv4 address against ZEN (SBL spam sources, CSS snowshoe, XBL exploited/botnet hosts, DROP hijacked ranges, PBL end-user ranges) or a domain against the Domain Block List (spam, phishing, malware, botnet C&C, abused legitimate domains). Returns listed yes/no, every return code with the list it means, and Spamhaus's lookup link. Point-in-time answer.
Output
Returns whether the IP or domain is listed on Spamhaus blocklists, all matching return codes with their corresponding list names and meanings (e.g. SBL, CSS, XBL, DROP, PBL for IPs; spam/phishing/malware/botnet C&C/abused-legit for domains), and a direct Spamhaus lookup URL for the queried entity.
Example use cases
Email deliverability pre-send check
“Before I send this marketing campaign, check if my mail server IP 203.0.113.15 is listed in Spamhaus ZEN — I need to know which specific lists it appears on before we start sending.”
Phishing domain reputation check
“I just received a suspicious email from a domain called example-offers.net — can you check it against the Spamhaus Domain Block List to see if it's flagged for phishing or malware?”
New server IP vetting
“We just spun up a new cloud server at IP 45.76.123.99 — can you run it against Spamhaus ZEN to make sure it's not listed in any botnet, spam source, or hijacked-range list before we start using it?”
Technical details
Endpoint
GEThttps://api.webintel-api.workers.dev/api/security/spamhaus-zen?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a point-in-time blocklist check against Spamhaus's authoritative ZEN (for IPs) or DBL (for domains) — the most widely trusted blocklists in email security. Prefer this over generic reputation APIs when you need specific Spamhaus list categorization (SBL vs XBL vs PBL vs DROP for IPs, or spam vs phishing vs malware vs botnet C&C for domains). Ideal for email deliverability checks, abuse triage, and security enrichment pipelines.
Side effects
- Missing both ip and domain parameters — returns error indicating one is required
- Invalid IPv4 format — may return error or no match
- IPv6 addresses not supported (IPv4 only)
- Domain not found in DBL — returns not-listed result
- Spamhaus DQS backend unavailable — may return timeout or upstream error
- Private/reserved IP ranges may return unexpected results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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