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HostKarma Black DNSBL Lookup
x402
HostKarma Black 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 a given IPv4 address is listed on the HostKarma Black DNSBL (hostkarma.junkemailfilter.com) and returns listed status, return codes, and reason text.
Price / call$0.01
Success—
StatusUnknown
How this service works
Is this IPv4 address listed on hostkarma black (hostkarma.junkemailfilter.com)? Performs the DNSBL query (reversed octets under hostkarma.junkemailfilter.com, 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 whether the IPv4 address is listed on the HostKarma Black DNSBL, the DNS return codes from the query, and, where available, the human-readable reason text explaining why the address is listed.
Example use cases
Pre-send email deliverability check
“Before we send our next campaign, check if our mail server IP 198.51.100.22 is listed on HostKarma Black — I want to know if it's blacklisted and what the reason is.”
Inbound spam filter triage
“We're getting suspicious emails from 203.0.113.85 — can you check if that IP is on the HostKarma Black DNSBL list so I know if it's a known spam source?”
New server reputation audit
“I just spun up a new VPS at 192.0.2.10 to use as a mail relay — can you verify whether it's listed on HostKarma Black before I start sending?”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/blacklist/hostkarma-black?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a precise, single-list check against the HostKarma Black DNSBL specifically — ideal when you want authoritative HostKarma listing status with reason codes rather than a multi-list aggregated score. Prefer this over generic multi-DNSBL tools when HostKarma is a required check for your email filtering or IP reputation pipeline.
Side effects
- Invalid IPv4 address format returns an error
- DNS resolution failure via Cloudflare DoH returns a lookup error
- IP not listed returns a negative result with no reason text
- Network timeout from Cloudflare DoH results in an error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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