WhoisJSON vs io.github.cyanheads/whois-mcp-server
WhoisJSON is an MCP server published by Whoisjson. Marketplaces we read that list it: 1 (Official MCP Registry). io.github.cyanheads/whois-mcp-server is an MCP server published by cyanheads. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-28. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  WhoisJSON |  io.github.cyanheads/whois-mcp-server |
|---|---|---|
| Official MCP Registry | Listed Version: 1.0.3 Downloads/month (npm): 127 Downloads/week (npm): 13 Forks (GitHub): 0 Stars (GitHub): 0 Not marked · First seen |
Listed Version: 0.2.1 Downloads/month (npm): 850 Downloads/week (npm): 322 Forks (GitHub): 0 Stars (GitHub): 1 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | WhoisJSON | io.github.cyanheads/whois-mcp-server |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 0 (worse) | 1 (better) |
| Forks (GitHub) | 0 | 0 |
| Last release (differs) | Not published | 2026-10-16 |
| Where it runs (differs) | On your machine (@whoisjson/mcp-server) | On your machine (@cyanheads/whois-mcp-server) |
| Transport | stdio | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | 1, secrets among them: 1 | 11, secrets among them: 0 |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/whoisjson/mcp-server | github.com/cyanheads/whois-mcp-server |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
WhoisJSON
WHOIS, DNS, SSL, and domain availability lookups for AI assistants
io.github.cyanheads/whois-mcp-server
Domain registry records and status, DNS records, and IP/ASN resolution over RDAP and DoH.
How to run each
WhoisJSON As a local MCP server: npm package
claude mcp add --env "WHOISJSON_API_KEY=<YOUR_WHOISJSON_API_KEY>" --transport stdio whoisjson -- npx -y @whoisjson/mcp-serverRequires: WHOISJSON_API_KEY (secret)
io.github.cyanheads/whois-mcp-server As a local MCP server: npm package
claude mcp add --transport stdio whois-mcp-server -- npx -y @cyanheads/whois-mcp-serverCommands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Only WhoisJSON asks for
WHOISJSON_API_KEY (secret)
Only io.github.cyanheads/whois-mcp-server asks for
DOH_MAX_RETRIESDOH_TIMEOUT_MSMCP_AUTH_MODEMCP_HTTP_ENDPOINT_PATHMCP_HTTP_HOSTMCP_HTTP_PORTMCP_LOG_LEVELMCP_PUBLIC_URLMCP_TRANSPORT_TYPERDAP_MAX_RETRIESRDAP_TIMEOUT_MS
Settings as each marketplace publishes them. Asking for fewer is not better in itself.
What it can do: WhoisJSON · What it can do: io.github.cyanheads/whois-mcp-server · Compare two other plugins
Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.