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ipv4.fr IP Blacklist Check API
x402
ipv4.fr IP Blacklist Check API is a paid API for AI agents from ipv4.fr, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).
Checks whether a given IPv4 address appears on spam/abuse blacklists and returns a clean/listed status with count
Price / call$0.003
Success—
StatusUnknown
How this service works
Fast, reliable network tools API. IP geolocation, DNS lookup, SSL check, WHOIS, email validation, port scan. Free tier available.
Output
Returns a JSON object containing the queried IP address, a boolean 'clean' flag indicating whether the IP is free of blacklist entries, and a 'listed_count' integer showing how many blacklists the IP appears on.
Example use cases
Email sender IP reputation check
“Before I send bulk emails from our server at 198.51.100.22, can you check if that IP is blacklisted on any spam databases?”
Suspicious traffic source investigation
“We're getting a lot of traffic from 185.220.101.5 — can you check if it's on any blacklists or abuse lists so I know if I should block it?”
New server IP verification
“I just got a new dedicated server with IP 91.108.4.10 — can you verify it's not already listed on any blacklists before I start using it?”
Technical details
Endpoint
GEThttps://ipv4.fr/x402/v1/blacklist/%7Bip%7D?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, affordable per-IP blacklist check with a clear clean/dirty signal and a count of listings. At $0.003 per call it is cost-effective for on-demand reputation checks. Prefer it over manual DNSBL lookups or heavier threat-intelligence platforms when you need a simple pass/fail reputation signal without complex setup.
Side effects
- Invalid IP format returns an error
- IPv6 addresses may not be supported (endpoint is IPv4-specific)
- Network timeout if blacklist databases are slow to respond
- Rate limiting if free tier quota is exceeded
- Private/reserved IP ranges may return unexpected results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ip": "8.8.8.8",
"clean": true,
"listed_count": 0
}
}Tags
x402
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