ipv4.fr Network Tools
fr.ipv4/network-toolsipv4.frstreamable-httpv1.0.0Scanned
DNS, WHOIS, SSL, IP geolocation, email validation, DNSBL blacklist, HTTP headers, subnet calc.
8 tools: 6 change things and 2 only read.
- Reads private data · 0
- Reads text others write · 8
- Can send data out · 1
- No findings
Anlyon alternative
6 of these tools change something. Run those as governed actions.
Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.
Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
8 tools
Changes things 6Claude Code: ask
http_headersHTTP response headers and status of a public URL (HEAD request, redirects followed and checked).Reads text others writeCan send data outNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
- outboundThe input takes a URL (input.url): a request to a URL can carry data to whoever runs it.
Description, as the server wrote it HTTP response headers and status of a public URL (HEAD request, redirects followed and checked).
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
ip_blacklistCheck an IPv4 address against 3 DNS blacklists (Barracuda, SpamCop, UCEPROTECT).Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it Check an IPv4 address against 3 DNS blacklists (Barracuda, SpamCop, UCEPROTECT).
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
ip_geolocationGeolocation of an IP address: country, city, ISP, coordinates, timezone.Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it Geolocation of an IP address: country, city, ISP, coordinates, timezone.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
ssl_checkTLS certificate of a host: validity, issuer, expiry, days remaining, SAN.Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it TLS certificate of a host: validity, issuer, expiry, days remaining, SAN.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
subnet_calcIPv4 subnet calculator from CIDR: network, broadcast, netmask, wildcard, host range, host count.Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it IPv4 subnet calculator from CIDR: network, broadcast, netmask, wildcard, host range, host count.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
whoisWHOIS registration data for a domain: registrar, creation and expiry dates, name servers.Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it WHOIS registration data for a domain: registrar, creation and expiry dates, name servers.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
Only reads 2Show 2 read-only tools
dns_lookupDNS records for a domain (A, AAAA, MX, TXT, NS by default; also CNAME, SOA).Reads text others writeNo findings
Why it is in this group
- The name "dns_lookup" says "lookup": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it DNS records for a domain (A, AAAA, MX, TXT, NS by default; also CNAME, SOA).
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
email_validateValidate an email address: syntax, MX records, SMTP check, disposable and role-based detection.Reads text others writeNo findings
Why it is in this group
- The name "email_validate" says "validate": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it Validate an email address: syntax, MX records, SMTP check, disposable and role-based detection.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.
Exfil surface
Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.
No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data.
- Reads private data0
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write8
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out1
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
No check matched anything in these tool definitions. That is not a safety guarantee.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 1.0.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http network-tools https://ipv4.fr/mcpclaude mcp add --transport http network-tools https://ipv4.fr/mcpRun in a terminal.
Claude Code permissions
Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.
{
"permissions": {
"allow": [
"mcp__network-tools__dns_lookup",
"mcp__network-tools__email_validate"
],
"ask": [
"mcp__network-tools__whois",
"mcp__network-tools__ssl_check",
"mcp__network-tools__ip_geolocation",
"mcp__network-tools__ip_blacklist",
"mcp__network-tools__http_headers",
"mcp__network-tools__subnet_calc"
],
"deny": []
}
}Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as network-tools. Review it before you use it.
Capability tags behind 8 rules
- mcp__network-tools__dns_lookup untrusted-input
- mcp__network-tools__whois untrusted-input
- mcp__network-tools__ssl_check untrusted-input
- mcp__network-tools__ip_geolocation untrusted-input
- mcp__network-tools__email_validate untrusted-input
- mcp__network-tools__ip_blacklist untrusted-input
- mcp__network-tools__http_headers untrusted-input, outbound
- mcp__network-tools__subnet_calc untrusted-input
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/fr.ipv4/network-tools/verify?hash=80a8bb8e66efa696d84c9e82d811dcc91813641b98af237d24dbbdbc99a7331a" | jq -e '.changed == false'Pinned hash 80a8bb8e66ef, from Oct 24, 2026, 16:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/fr.ipv4/network-tools/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/fr.ipv4/network-tools)Source: MCP Registry. Synced Oct 24, 2026, 16:17 UTC.