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SpamRATS NOPTR DNSBL Lookup
x402
SpamRATS NOPTR 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 2026-10-09).
Checks whether a given IPv4 address is listed on the SpamRATS NOPTR blacklist (noptr.spamrats.com) via DNS-based lookup 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 spamrats noptr (noptr.spamrats.com)? Performs the DNSBL query (reversed octets under noptr.spamrats.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 a yes/no listed status indicating whether the IPv4 address appears on the SpamRATS NOPTR blacklist, along with the DNSBL return codes and, where published by the list, the human-readable reason text explaining why the IP is listed.
Example use cases
Email server IP reputation check
“Before I send emails from 198.51.100.77, can you check if it's listed on the SpamRATS NOPTR blacklist? I want to know if it's flagged and why.”
Incoming connection spam screening
“This IP 203.0.113.15 just tried to connect to our mail server — is it on the SpamRATS NOPTR blacklist? Give me the listed status and any return codes.”
IP deliverability audit
“I'm auditing our sending IPs for deliverability issues. Can you check whether 192.0.2.88 appears on the SpamRATS NOPTR DNSBL and what reason code it has?”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/blacklist/spamrats-noptr?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a precise, single-list check specifically against SpamRATS NOPTR (targeting IPs with no PTR/reverse DNS record). Prefer this over generic multi-list blacklist checkers when you need authoritative return codes and reason text from SpamRATS NOPTR specifically, or when building automated mail filtering pipelines that need per-list granularity.
Side effects
- Invalid or non-IPv4 address input returns an error
- DNS resolution failure via Cloudflare DoH results in an error or indeterminate response
- IP not listed returns listed: false with no reason text
- Transient network issues may cause lookup timeouts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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