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EFnet RBL IPv4 DNSBL Lookup
x402
EFnet RBL IPv4 DNSBL Lookup is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).
Checks whether an IPv4 address is listed on the EFnet RBL (rbl.efnetrbl.org) DNS-based blacklist, returning listed status, return codes, and reason text.
Price / call$0.01
Success—
StatusUnknown
How this service works
Is this IPv4 address listed on efnet rbl (rbl.efnetrbl.org)? Performs the DNSBL query (reversed octets under rbl.efnetrbl.org, via Cloudflare DoH) and returns listed yes/no with the return codes and, where the list publishes one, the reason text. One list, one precise answer. $0.01 per lookup.
Output
Returns a yes/no listed status for the queried IPv4 address on rbl.efnetrbl.org, along with the DNSBL return/response codes and, where published by the list, a human-readable reason text explaining why the address is listed.
Example use cases
Email server deliverability check
“Before I send our marketing campaign, check if our mail server IP 203.0.113.10 is listed on the EFnet RBL so I know if it might get blocked.”
Inbound connection abuse screening
“We're seeing suspicious traffic from 198.51.100.77 — can you check if that IP is on the EFnet RBL blacklist and what reason code it carries?”
New hosting IP reputation audit
“We just got assigned 104.21.88.34 from our new hosting provider — can you verify it's not listed on the EFnet RBL before we start using it?”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/blacklist/efnet-rbl?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to check an IPv4 address against the EFnet RBL (rbl.efnetrbl.org) DNS blacklist — for example when screening email senders, auditing new IP allocations, or filtering IRC/network abuse. Prefer it over generic reputation services when you need the precise EFnet RBL return codes and reason text for one specific list rather than an aggregated multi-list score.
Side effects
- Invalid or non-public IPv4 address returns an error or no result
- DNS resolution failure via Cloudflare DoH causes a lookup error
- IPv6 addresses are not supported (IPv4 only)
- IP not listed returns a clean/not-listed result with no reason text
- Temporary DNS timeout may cause intermittent failures
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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