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whois-mcp-server MCP Server

Domain registration, availability, DNS records, and IP/ASN resolution via RDAP and DNS-over-HTTPS.

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

Pod has not dialled whois-mcp-server yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

Connect

Published as @cyanheads/whois-mcp-server on npm. Runs locally.

Known issues

11 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 8.

Most discussed

bug(whois_lookup_ip): IP/CIDR validator accepts malformed input and misses reserved ranges

Server version

0.1.3

mcp-ts-core version

0.10.6

Runtime

Bun

Runtime version

Bun 1.3.11 / Bun 1.3.14

Transport

HTTP (Streamable HTTP)

Description

whois_lookup_ip's address validator (validateIp / isPrivateIp in src/services/rdap/rdap-service.ts) is too permissive in three related ways, all confirmed against the current source:

  1. Extra CIDR suffixes are silently dropped. hasCidr is computed as parts.length === 2, so an input with more than one `

Read the thread · 2026-06-28 · open · 3 comments

ux(whois_get_dns): description leaks internal resolver routing details

The whois_get_dns tool description exposes internal implementation details that aren't useful to callers and shouldn't be part of the public tool contract:

"Uses Cloudflare 1.1.1.1 as primary resolver with Google 8.8.8.8 as fallback (and primary for CAA records, since Cloudflare returns raw hex wire format for those)."

This tells the caller which specific DNS resolver IPs are used and why one is routed differently for CAA — an internal routing decision. The caller only needs to know that D

Read the thread · 2026-06-07 · closed · 3 comments

ux(whois_check_availability): rdap_no_coverage error contract is dead — no-coverage case returns data, never throws

The whois_check_availability tool declares an errors[] contract entry for rdap_no_coverage:

{ reason: 'rdap_no_coverage', code: JsonRpcErrorCode.NotFound, ... }

But the handler never throws this error. When the TLD has no RDAP coverage, it returns { available: null, rdap_coverage: false } as a successful result — which is actually the correct, preferable behavior (availability-check callers want a concrete answer, not an error).

Steps to reproduce

  1. Call `whois_check_a

Read the thread · 2026-06-07 · closed · 2 comments

bug(whois_lookup_domain): domain_not_found error missing recovery.hint

Server version

0.1.1

mcp-ts-core version

^0.9.21

Runtime

Bun/Node

Transport

HTTP (Streamable HTTP), confirmed via field test

Description

The domain_not_found error contract on whois_lookup_domain declares a recovery hint but it never appears in the error response. The contract's recovery text ("The domain is not registered. Use whois_check_availability to confirm availability for registration.") is absent from result.structuredContent.error.data.

Steps t

Read the thread · 2026-06-07 · closed · 2 comments

fix(dns): DoH fallback uses Google Public DNS, whose API terms restrict relaying

The DNS-over-HTTPS layer falls back to Google Public DNS (dns.google) for CAA records and as failover for other record types. Google's APIs Terms of Service §4(a) prohibits creating "an API Client that functions substantially the same as the APIs and offer it for use by third parties" — which a server resolving DNS on behalf of its callers arguably does. The [Cloudflare](https://developers.cloudfl

Read the thread · 2026-06-05 · closed · 2 comments

Most recent

bug(whois_get_dns): mixed resolver queries collapse provenance to Cloudflare

Server version

0.1.3

mcp-ts-core version

0.10.6

Runtime

Bun

Runtime version

Bun 1.3.14

Transport

HTTP (Streamable HTTP)

Description

whois_get_dns can fetch one response from multiple resolvers, but its singular source field reports only cloudflare whenever any non-CAA query succeeds there. A mixed query therefore loses the provenance of records returned by NextDNS in both MCP result paths.

Steps to reproduce

  1. Call whois_get_dns with `{ "domain":

Read the thread · 2026-07-16 · open · 0 comments

bug(whois_get_dns): empty types returns fabricated resolver provenance

Server version

0.1.3

mcp-ts-core version

0.10.6

Runtime

Node.js

Runtime version

Node 24.x

Transport

HTTP (Streamable HTTP)

Description

whois_get_dns accepts an empty types array, performs no DNS query, and returns a successful result whose source: "nextdns" claims resolver provenance that never occurred.

Steps to reproduce

  1. Call whois_get_dns with { "domain": "github.com", "types": [] }.
  2. Inspect both result paths.

Actual behavior


[Read the thread](https://github.com/cyanheads/whois-mcp-server/issues/9) · 2026-07-16 · open · 0 comments

### bug(whois_lookup_asn): malformed ASN strings are accepted via parseInt truncation

### Server version

0.1.3

### mcp-ts-core version

0.10.6

### Runtime

Bun

### Runtime version

Bun 1.3.11

### Transport

HTTP (Streamable HTTP)

### Description

`whois_lookup_asn` accepts malformed ASN strings because the service normalizes with `parseInt` and does not require the full input to match `AS<number>` or a bare integer. Inputs with trailing characters or decimal notation are silently truncated and resolved as real ASNs.

### Steps to reproduce

1. Start the server over HTTP.
2.

[Read the thread](https://github.com/cyanheads/whois-mcp-server/issues/5) · 2026-06-28 · open · 0 comments

[See all 11 reports Pod holds for whois-mcp-server](/mcp/whois-mcp-server/issues).

## Firsthand observations

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## For agents

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