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SiteCheck Web Intel – Barracuda Reputation Block List Lookup
x402
SiteCheck Web Intel – Barracuda Reputation Block List Lookup 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 2026-10-24).
Checks an IPv4 mail-sending address against the Barracuda Reputation Block List (BRBL) via public DNS and returns whether the IP is listed and what response code it received.
Price / call$0.002
Success—
StatusUnknown
How this service works
Checks an IPv4 mail-sending address against the Barracuda Reputation Block List (b.barracudacentral.org) through public DNS. Listed addresses return a 127.0.0.x code; unlisted ones return no record. The list is updated continuously, so this is a point-in-time answer. Domain reputation is not covered.
Output
Returns whether the queried IPv4 address is listed on the Barracuda Reputation Block List. If listed, includes the 127.0.0.x DNS response code indicating the listing type. If unlisted, returns no record. This is a point-in-time result reflecting the continuously updated BRBL.
Example use cases
Pre-send mail server vetting
“Before we start our email campaign, can you check if our outbound mail server IP 203.0.113.15 appears on the Barracuda Reputation Block List so we know if deliverability will be an issue?”
Investigating spam complaint source
“We got a spam complaint mentioning the IP 185.220.101.33 — can you look it up on the Barracuda BRBL and tell me if it's listed and what response code came back?”
Automated deliverability health check
“I want to verify that none of our three sending IPs — 192.0.2.10, 198.51.100.22, and 203.0.113.55 — are blocked on the Barracuda block list. Can you check each one?”
Technical details
Endpoint
GEThttps://api.webintel-api.workers.dev/api/security/barracuda-reputation?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, DNS-based check of a specific IPv4 address against the Barracuda Reputation Block List specifically — ideal for email deliverability pre-flight checks, spam source investigation, or automated infrastructure vetting. Prefer it over generic IP reputation APIs when Barracuda BRBL coverage is specifically required. Note it does not cover domain reputation or other blocklists.
Side effects
- Invalid or non-IPv4 input returns an error or no result
- IPv6 addresses are not supported by this endpoint
- Transient DNS failures may produce false negatives — retry recommended
- The list is point-in-time; a recently listed or delisted IP may not reflect the current state immediately
- No domain-level reputation is returned — only IPv4 addresses are checked
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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