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FernTool

Free no-key JSON API for IP geolocation, WHOIS, DNS and network utilities, with an MCP server for AI agents.

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FernTool provides a free, keyless JSON API (CORS enabled) with endpoints for IP lookup and validation (with Tor/datacenter flags), batch IP lookup, RDAP WHOIS, DNS and reverse DNS, DNS propagation checks, SPF/DKIM/DMARC email security checks, website status, redirect tracing, subnet calculation, timestamp/date/timezone conversion, random numbers, and QR code generation. It also exposes an MCP server (streamable HTTP) with tools such as lookup_ip, whois_lookup, dns_lookup, subnet_calc and convert_timezone, plus an OpenAPI 3.1 spec. Data sources include DB-IP (CC BY 4.0), IPtoASN, and Cloudflare DoH.

Category
APIs & backend
Pricing
free
Free tier
yes
API
yes
MCP server
yes
SDK
no
Open source
unknown

#ip-geolocation#whois#dns#mcp-server#openapi#free-api#network-tools

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Listed 2026-10-25 · last verified 2026-10-25 · extracted by @cf/zai-org/glm-5.3-flash · confidence 0.9

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