HTTPfy MCP server

Free, read-only, no-authentication remote MCP server for DNS, email authentication, TLS certificates, WHOIS, IP/ASN and network diagnostics, run from httpfy.io servers.

• Endpoint: https://httpfy.io/mcp (Streamable HTTP, protocol 2026-07-28 and 2025-03-26 to 2025-11-25)

• Docs and one-prompt setup: https://httpfy.io/agents

• Server card: https://httpfy.io/.well-known/mcp/server-card.json

• No account, no API key. Limits per client per hour: 100 lookups, 30 active checks, 10 probes (details).

• Results are licensed CC BY 4.0; every result includes a report_url to the full report.

This repository holds the manifests that let agent clients and directories install the server. The server itself runs at httpfy.io.

Install

Related MCP server: Dechonet MCP

Tools

• dns_lookup (domain, record_type): Look up DNS records of one type (A, AAAA, CNAME, MX, NS, SOA, TXT, SRV) for a domain using public resolvers.

• dns_propagation_check (domain_name, query_type): Query a domain on about 40 public resolvers in different regions and report which ones return which answers, to see whether a DNS change has propagated.

• dnssec_check (domain): Validate the DNSSEC chain of trust for a domain from the root down (DS, DNSKEY, RRSIG) and report each zone as secure, insecure or broken.

• mx_lookup (domain): List the mail exchanger (MX) records of a domain with their preferences.

• spf_lookup (domain): Fetch the SPF record of a domain from its authoritative name server and list its mechanisms (ip4, ip6, include, redirect, all).

• spf_validate (domain): Validate the SPF record of a domain: syntax, single-record rule, DNS lookup count (limit 10), void lookups, includes and the all mechanism.

• domain_whois (domain): WHOIS registration data for a domain: registrar, dates, status and name servers (personal contact data is redacted by registries).

• domain_expiry (domain_name): Registration and expiry dates of a domain, with the time remaining before it expires.

• ssl_certificate_check (domain): Connect to a domain on port 443 and report the certificate chain: subject, issuer, validity dates, days remaining, SANs and chain details.

• ping (host): Ping a public host from httpfy servers (4 ICMP echo requests) and report packet loss and round-trip times. Useful to test reachability from outside your own network.

• traceroute (host): Traceroute to a public host from httpfy servers (up to 10 hops). Internal hops of httpfy's own network are masked.

• ip_whois (ip_address): WHOIS / registry data for a public IPv4 address: ASN, network range, owner organisation and registry.

• ip_blacklist_check (ip_address): Check whether a public IPv4 address is listed on common DNS-based blocklists such as Spamhaus, Barracuda and SpamCop.

• mac_vendor_lookup (mac_address): Identify the manufacturer registered for a MAC address prefix (OUI) using the IEEE registry.

• asn_lookup (query): Look up the autonomous system (ASN) for a public IP address, or details for an ASN such as AS15169: name, country, announced prefixes and address counts.

• bimi_check (domain): Check the BIMI record of a domain, whether DMARC meets BIMI requirements, and whether the SVG logo and certificate URLs are reachable and well formed.

• caa_check (domain): Find the CAA records that apply to a domain (climbing to parent domains per RFC 8659) and list which certificate authorities may issue certificates.

• certificate_transparency_search (domain): List certificates logged in Certificate Transparency for a domain (via crt.sh): issuer, validity window and names, with a summary by issuer.

• dkim_check (domain, selector): Check DKIM public keys for a domain. With a selector it checks that selector; without one it probes common selectors. Reports key type and RSA key length and flags weak or revoked keys.

• dmarc_check (domain): Find and explain the DMARC record of a domain (policy, pct, rua/ruf, alignment) and flag weaknesses such as p=none or missing external report authorization.

• dns_report (domain): Full DNS report for a domain: delegation from the root, every authoritative name server checked individually (reachability, recursion, TCP, consistency), SOA values, MX records and their reverse DNS, SPF, DMARC, DKIM and DNSSEC.

• domain_health_report (domain): Grade a domain A to F across 11 checks (name servers, SOA, DNSSEC, MX, SPF, DMARC, CAA, HTTPS certificate, HTTP to HTTPS redirect, HSTS, IPv6), with a reason and fix for each failed check.

• mta_sts_check (domain): Check MTA-STS (TXT record and the HTTPS policy file, mode and MX patterns) and the TLS-RPT reporting record for a domain.

• port_check (host, port): Check whether one TCP port on a public host is open, closed or filtered when tested from httpfy servers on the internet.

The Agent Skill explains which tool answers which question. Download it as a zip from https://httpfy.io/agents/httpfy-network-checks.zip.

Repository layout

Try it

curl -s https://httpfy.io/mcp -H 'content-type: application/json' -H 'accept: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"dmarc_check","arguments":{"domain":"paypal.com"}}}'

Privacy and terms

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License

Manifests and documentation in this repository: MIT. Check results: CC BY 4.0, credit httpfy.io.