DNS, WHOIS, SSL, IP geolocation, email validation, DNSBL blacklist, HTTP headers, subnet calc.
Connect Remote server
claude mcp add --transport http network-tools https://ipv4.fr/mcp --header "X-Api-Key: <X_API_KEY>"
{
"mcpServers": {
"network-tools": {
"url": "https://ipv4.fr/mcp",
"headers": {
"X-Api-Key": "<X_API_KEY>"
}
}
}
}
{
"servers": {
"network-tools": {
"type": "http",
"url": "https://ipv4.fr/mcp",
"headers": {
"X-Api-Key": "<X_API_KEY>"
}
}
}
}
Settings > Connectors > Add custom connector
URL: https://ipv4.fr/mcp
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools 9 found in our last check
dns_lookupDNS records for a domain (A, AAAA, MX, TXT, NS by default; also CNAME, SOA).
whoisWHOIS registration data for a domain: registrar, creation and expiry dates, name servers.
ssl_checkTLS certificate of a host: validity, issuer, expiry, days remaining, SAN.
ip_geolocationGeolocation of an IP address: country, city, ISP, coordinates, timezone.
email_validateValidate an email address: syntax, MX records, SMTP check, disposable and role-based detection.
ip_blacklistCheck an IPv4 address against 3 DNS blacklists (Barracuda, SpamCop, UCEPROTECT).
http_headersHTTP response headers and status of a public URL (HEAD request, redirects followed and checked).
subnet_calcIPv4 subnet calculator from CIDR: network, broadcast, netmask, wildcard, host range, host count.
domain_auditAI security audit of a domain: DNS, SPF, DMARC, TLS, HTTP security headers, WHOIS expiry and IP blacklists, returned as a 0-100 score, findings by severity and exact fixes. Requires a paid ipv4.fr API key (X-Api-Key header); uses 10 requests of the daily limit. Without a key, pa…
Headers
| Name | Description |
|---|---|
X-Api-KeyOptional, secret | Optional ipv4.fr API key for higher limits (https://ipv4.fr/pricing). Without it: 20 free calls per day. |
Details
| Endpoint | https://ipv4.fr/mcp (Streamable HTTP) |
| First published | 24 Oct 2026 |
| Last updated | 24 Oct 2026 |
| Registry name | fr.ipv4/network-tools |
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