ipv4.fr Network Tools

fr.ipv4Published by ipv4.frOfficial publisherv1.0.0Updated Oct 25, 2026

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

VerifiedStreamable HTTPWeb executableWeb Search & ScrapingSecurity & Monitoring

Overview

AI-generated overview

A remote MCP server for network diagnostics: DNS, WHOIS, TLS, IP geolocation, email validation, blacklists, HTTP headers and subnet math.

What you can do
Look up DNS records and WHOIS registration data for domains, and inspect a host's TLS certificate validity and expiry. Geolocate IP addresses and check IPv4 addresses against DNS blacklists. Validate email addresses for syntax, MX, SMTP and disposable or role-based patterns. Fetch HTTP response headers and status for a public URL, and calculate IPv4 subnets from CIDR. Run a combined domain security audit scored 0-100 with findings by severity and suggested fixes.
When to use it
Useful when you need quick domain, DNS, certificate or IP checks without leaving the assistant, such as troubleshooting mail or DNS setup, verifying a certificate before expiry, or getting a consolidated security picture of a domain.
Requirements
Remote streamable HTTP endpoint at ipv4.fr; no local install. No account needed for basic use, limited to 20 free calls per day. An optional ipv4.fr API key is sent in the X-Api-Key header for higher limits.
Before you install
The domain audit requires a paid API key and consumes 10 requests of the daily limit; without a key it is billed per call via x402, so spending can occur. Queries about domains, IPs, emails and URLs are sent to a third-party service. The audit returns recommendations only and changes nothing itself.

Installation

In SourceWeft

  1. Open ipv4.fr Network Tools in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/fr.ipv4%2Fnetwork-tools/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

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

Tools

9

dns_lookup

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

Parameterstypesdomainrequired

whois

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

Parametersdomainrequired

ssl_check

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

Parametershostrequiredport

ip_geolocation

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

Parametersiprequired

email_validate

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

Parametersemailrequired

ip_blacklist

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

Parametersiprequired

http_headers

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

Parametersurlrequired

subnet_calc

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

Parameterscidrrequired

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).

Parametersdomainrequired

Version history

1
  1. v1.0.0LatestOct 25, 2026

Score

72% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts

    Publish an icon in the registry entry.

  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.

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