FernTool

About

FernTool exposes network and everyday utilities from ferntool.com. It covers IP lookup with VPN, Tor and datacenter flags, batch IP lookup, RDAP WHOIS, DNS records, reverse DNS, DNS propagation checks and a subnet calculator. It also offers exact time and date maths, time zone conversion, QR codes, word counts, AI cost estimates, AI service status and secure random picks.

It runs as a hosted streamable HTTP endpoint at https://www.ferntool.com/mcp. No sign-in or API key is needed.

What you can do

• Look up IP details, including Tor and datacenter flags, singly or in batches of 100
• Run RDAP WHOIS for domains, IPs and ASNs
• Resolve DNS records and check propagation across public resolvers
• Calculate IPv4 and IPv6 subnets from CIDR
• Get the current time and convert timestamps and time zones
• Do exact date maths and business day counts
• Generate QR codes and count words exactly
• Draw secure random numbers and pick winners or teams

Tools 22

• get_my_ip

  Return the caller's public IP with ISP, ASN, location and timezone.

• lookup_ip

  Validate an IP and return version, scope, country, ASN and network owner.

• validate_ip

  Check whether a string is a valid IPv4 or IPv6 address and classify it.

• batch_lookup_ip

  Look up 1-100 IP addresses at once, with Tor and datacenter flags.

• whois_lookup

  RDAP WHOIS for a domain, IP address or ASN.

• dns_lookup

  Resolve DNS records for a domain via Cloudflare DNS-over-HTTPS.

• reverse_dns

  PTR lookup for an IP with forward-confirmation check.

• subnet_calc

  IPv4/IPv6 CIDR subnet calculator with hosts, masks and broadcast.

• estimate_ai_cost

  Estimate token count and USD cost of a text across major AI models.

• make_qr_code

  Create a static QR code as SVG plus an image URL.

• count_words

  Count words, characters, sentences and paragraphs with reading time.

• get_current_time

  Get the exact current date and time in UTC and a chosen time zone.

Read from the live server on 24 Oct 2026.

Example prompts

• Check whether the DNS change for example.com has propagated.

• Look up this IP and tell me if it is a VPN or datacenter: 8.8.8.8

• What is 9am Johannesburg time in New York next Friday?

• Pick 3 random winners from this list of names.

Set up

Every client connects to ferntool.com. Pick yours; the page remembers your choice.

claude mcp add --transport http ferntool https://www.ferntool.com/mcp

https://www.ferntool.com/mcp

{
  "mcpServers": {
    "ferntool": {
      "url": "https://www.ferntool.com/mcp"
    }
  }
}

code --add-mcp '{"name":"ferntool","type":"http","url":"https://www.ferntool.com/mcp"}'

{
  "servers": {
    "ferntool": {
      "type": "http",
      "url": "https://www.ferntool.com/mcp"
    }
  }
}

{
  "mcpServers": {
    "ferntool": {
      "serverUrl": "https://www.ferntool.com/mcp"
    }
  }
}

codex mcp add ferntool --url https://www.ferntool.com/mcp

[mcp_servers.ferntool]
url = "https://www.ferntool.com/mcp"

gemini mcp add --transport http ferntool https://www.ferntool.com/mcp

{
  "mcpServers": {
    "ferntool": {
      "type": "http",
      "url": "https://www.ferntool.com/mcp"
    }
  }
}

Embed

Show FernTool in a README or on your site. Each embed links to this page, uses the server’s own URL, and sets no cookies. How embeds work

The card, the iframe and the JSON are in English. Add ?lang=it, fr, de or es to their address for another language.

README badge Website card iframe JSON AI prompt

README badge

Markdown

[![FernTool on mcp.tc](https://mcp.tc/i/ferntool/badge.svg)](https://mcp.tc/i/ferntool)

HTML

<a href="https://mcp.tc/i/ferntool"><img src="https://mcp.tc/i/ferntool/badge.svg" alt="FernTool on mcp.tc" height="20"></a>

It follows the reader’s light or dark mode. Add ?theme=light or ?theme=dark to fix it, or ?style=compact to show the mark without the word.

Website card

HTML

<script src="https://mcp.tc/w/ferntool.js" async></script>

The card appears where the tag is. Add data-theme="dark" or data-size="compact" to the tag to change it. The file holds everything it needs, so it makes no other requests and sets no cookies.

iframe

HTML

<iframe src="https://mcp.tc/embed/ferntool" title="FernTool on mcp.tc" width="420" height="200" loading="lazy" allow="clipboard-write" style="border:0;border-radius:8px;max-width:100%"></iframe>

Use it on pages that don’t allow scripts. Add ?theme=light or ?theme=dark to the address to fix the colors.

JSON

The listing as data for your own pages and tools: name, tagline, the server’s own URL, tools and the “Add to” links. Any site can read it (CORS is open).

https://mcp.tc/i/ferntool.json

What each field means

AI prompt

Paste this into an AI coding assistant, such as Claude Code or Cursor, and it adds the FernTool card to your site.

Markdown

Add the mcp.tc card for FernTool, an MCP server, to my website. It is one static script: no build step, no package to install, no cookies.

Put this tag where the card should appear. The card renders right before it:

```html
<script src="https://mcp.tc/w/ferntool.js" async></script>
```

To show the card somewhere else, put this placeholder there and load the same script once, for example before `</body>`. Keep the link inside: visitors without JavaScript see it.

```html
<div data-mcptc="ferntool"><a href="https://mcp.tc/i/ferntool">FernTool on mcp.tc</a></div>
```

Options:
- `data-theme="light"` or `"dark"` on the tag or the placeholder fixes the colors. Without it, the card follows the visitor’s light or dark mode.
- `data-size="compact"` gives a smaller card without the tagline.
- The CSS variable `--mcptc-max-width` on the placeholder or a parent sets the width (default `520px`).
- `?lang=` on the script URL sets the card’s language: `en`, `it`, `fr`, `de` or `es`.

If the site has a Content Security Policy, allow `script-src https://mcp.tc` and `img-src data:` (the icon is inline).

For a README or other Markdown docs, use the badge instead:

```markdown
[![FernTool on mcp.tc](https://mcp.tc/i/ferntool/badge.svg)](https://mcp.tc/i/ferntool)
```

Reference: https://mcp.tc/embed

Change history

We read this server’s tool list every 3 hours and record what changes. Last read 25 Oct 2026, 02:37 UTC.

1. 24 Oct 2026, 04:40 UTC, Automatic check

   New version 0.10.0 (was 0.9.0). Reported by the server.

2. 24 Oct 2026, 04:40 UTC, Automatic check

   1 tool added. Server instructions changed.

   New server instructions

   Details, 24 Oct 2026, 04:40 UTC

   Added 1

   • trace_redirects

     Where does a link really go? Follows a URL (short links like bit.ly, tracking links, QR code links) hop by hop without a browser: every redirect with status code (301/302/307/308/meta refresh), final URL and page title, plus warning signs (ends on a different site, domain registered < 30 days ago, punycode look-alike name, bare IP, no HTTPS, loops, long chains) and a copy of the final URL with tracking parameters removed. Does not scan pages for malware. Max 10 hops; cached 60 s.

   Server instructions

   Before

   Network tools from ferntool.com: IP geolocation with VPN/Tor/datacenter flags, batch IP lookup, RDAP WHOIS, DNS, reverse DNS, DNS propagation checks, email security (SPF/DKIM/DMARC) checks, website up/down checks, subnet calculator, static QR codes, exact word/character counts, the current time, timestamp conversion, exact date maths, time zone conversion, fair random numbers and random picks from a list.

   After

   Network tools from ferntool.com: IP geolocation with VPN/Tor/datacenter flags, batch IP lookup, RDAP WHOIS, DNS, reverse DNS, DNS propagation checks, email security (SPF/DKIM/DMARC) checks, website up/down checks, link redirect tracing, subnet calculator, static QR codes, exact word/character counts, the current time, timestamp conversion, exact date maths, time zone conversion, fair random numbers and random picks from a list.

3. 23 Oct 2026, 04:36 UTC, Automatic check

   New version 0.9.0 (was 0.8.0). Reported by the server.

4. 23 Oct 2026, 04:36 UTC, Automatic check

   2 tools added. Server instructions changed.

   New server instructions

   Details, 23 Oct 2026, 04:36 UTC

   Added 2

   • check_email_security

     Can someone fake (spoof) email from a domain? Reads SPF (counts the 10 DNS-lookup limit, follows includes), DMARC (policy, pct, reports, inherited from the parent domain) and DKIM keys (common selectors, or the one given), detects the email provider from MX, and returns a plain verdict (protected / partial / unprotected) plus the exact TXT records to add.

   • check_website_status

     Is a website down? Resolves its DNS and loads the URL once (10 s timeout) from FernTool's Cloudflare edge, then returns verdict (up/down), reason (ok, blocked_bot, page_not_found, server_error, timeout, tls, dns_nxdomain...), HTTP status, response time, final URL after redirects and server country/network. One vantage point only; results cached 30 s.

   Server instructions

   Before

   Network tools from ferntool.com: IP geolocation with VPN/Tor/datacenter flags, batch IP lookup, RDAP WHOIS, DNS, reverse DNS, DNS propagation checks, subnet calculator, static QR codes, exact word/character counts, the current time, timestamp conversion, exact date maths, time zone conversion, fair random numbers and random picks from a list.

   After

   Network tools from ferntool.com: IP geolocation with VPN/Tor/datacenter flags, batch IP lookup, RDAP WHOIS, DNS, reverse DNS, DNS propagation checks, email security (SPF/DKIM/DMARC) checks, website up/down checks, subnet calculator, static QR codes, exact word/character counts, the current time, timestamp conversion, exact date maths, time zone conversion, fair random numbers and random picks from a list.

5. 22 Oct 2026, 04:26 UTC, Automatic check

   Tracking started: 19 tools.

FAQ