ipv4.fr Network Tools MCP Server

by ipv4 Your server? Claim it

answering

ipv4.fr Network Tools is answering right now. Last checked 6 min ago. It exposes 9 tools.

DNS, WHOIS, SSL, IP geolocation, email validation, DNSBL blacklist, HTTP headers, subnet calc.

Uptime history 9 days of history · worst day 99%

9 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

1122 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check ipv4.fr Network Tools every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add network-tools --transport http https://ipv4.fr/mcp

Settings → Connectors → Add custom connector, then paste this address

https://ipv4.fr/mcp

~/.codex/config.toml

[mcp_servers.network-tools]
url = "https://ipv4.fr/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "network-tools": {
      "url": "https://ipv4.fr/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "network-tools": {
      "type": "http",
      "url": "https://ipv4.fr/mcp"
    }
  }
}

Available tools 9

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

blacklist

ip_blacklist

Check an IPv4 address against 3 DNS blacklists (Barracuda, SpamCop, UCEPROTECT).

dns

dns_lookup

DNS records for a domain (A, AAAA, MX, TXT, NS by default; also CNAME, SOA).

domain

domain_audit

AI 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, pay per call with x402 (0.05 USDC on Base).

email_validate

Validate an email address: syntax, MX records, SMTP check, disposable and role-based detection.

geolocation

ip_geolocation

Geolocation of an IP address: country, city, ISP, coordinates, timezone.

http

http_headers

HTTP response headers and status of a public URL (HEAD request, redirects followed and checked).

ssl

ssl_check

TLS certificate of a host: validity, issuer, expiry, days remaining, SAN.

subnet

subnet_calc

IPv4 subnet calculator from CIDR: network, broadcast, netmask, wildcard, host range, host count.

whois

whois

WHOIS registration data for a domain: registrar, creation and expiry dates, name servers.

Endpoints

URL	Transport	State	Latency	Checked
https://ipv4.fr/mcp	streamable-http	answering	1102 ms	6 min ago

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ipv4.fr Network Tools — questions

Answers built from our own checks of this server.

What can ipv4.fr Network Tools do?

It exposes 9 tools, read directly from the server on our last check. Among them: dns_lookup, domain_audit, email_validate, http_headers, ip_blacklist, ip_geolocation and 3 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is ipv4.fr Network Tools working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 1122 ms. The bar chart above shows every period we have measured.

How do I connect ipv4.fr Network Tools?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does ipv4.fr Network Tools need an API key?

No. ipv4.fr Network Tools completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 9 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is ipv4.fr Network Tools?

It answers our handshake in 1122 ms on average, which is faster than 4% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.