MCP server

Iana Registries

io.github.cyanheads/iana-registries-mcp-server

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Find IANA ports, MIME types, HTTP codes/fields, URI schemes, PENs, BCP 47 tags, RFCs, any registry.

Working at last checkAbout 5,622 tokens per request once connected10 tools

Source

https://iana-registries.caseyjhand.com/mcp

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 10
Token cost: About 5,622 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to Cursor Add to VS Code VS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http iana-registries-mcp-server https://iana-registries.caseyjhand.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.iana-registries-mcp-server]
url = "https://iana-registries.caseyjhand.com/mcp"

Gemini CLI

{"mcpServers":{"iana-registries-mcp-server":{"httpUrl":"https://iana-registries.caseyjhand.com/mcp"}}}

Cursor

{"mcpServers":{"iana-registries-mcp-server":{"url":"https://iana-registries.caseyjhand.com/mcp"}}}

VS Code

{"servers":{"iana-registries-mcp-server":{"type":"http","url":"https://iana-registries.caseyjhand.com/mcp"}}}

Antigravity

agy mcp add iana-registries-mcp-server https://iana-registries.caseyjhand.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"iana-registries-mcp-server","server_url":"https://iana-registries.caseyjhand.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"iana-registries-mcp-server","server_url":"https://iana-registries.caseyjhand.com/mcp"}

Tools

iana_get_registry_records ~994 tokens
Read records from any IANA XML registry by id, e.g. registry "tls-parameters" with subregistry "tls-parameters-4" (TLS Cipher Suites), "protocol-numbers", "http-methods", or "cbor-tags"; an iana.org/assignments URL also works. Filter with `value` (exact match on the key column, or on the column `fie
iana_get_rfc_status ~728 tokens
Get the current status of up to ten distinct RFCs, Internet-Drafts, or BCP/STD/FYI series per page from up to 1,000 input items. Canonical aliases resolve once. When more remain, deferred_ids previews the next ten, deferred_count counts the whole remainder, and next_ids_offset continues the same ori
iana_lookup_http_field ~465 tokens
Look up a registered HTTP field (header or trailer) name. Pass exactly one of `name` (case-insensitive, e.g. "Cache-Status") or `keyword` (words matched against field names and comments). Returns the registration status — permanent, provisional, deprecated, or obsoleted — the Structured Field type w
iana_lookup_http_status ~387 tokens
Look up an HTTP status code in the IANA registry, or search reason phrases. Pass exactly one of `code` (100–599) or `keyword` (e.g. "too many"). Returns the registered phrase, its class, defining reference with section, and whether it is temporary, obsoleted, or unused; an unassigned code returns fo
iana_lookup_language_tag ~572 tokens
Parse and validate a BCP 47 language tag against the IANA Language Subtag Registry, or search subtags by description. Pass exactly one of `tag` (e.g. "zh-Hant-TW", "sr-Latn", "en_US") or `description` (e.g. "Swiss German"). A tag is split into language, extlang, script, region, variant, extension, a
iana_lookup_media_type ~635 tokens
Look up registered media (MIME) types. Pass exactly one of `type` (a full name such as "application/json"; parameters after ";" are ignored) or `keyword` (words matched against registered type names and status annotations, e.g. "geo json"; never against file extensions). An exact `type` lookup also
iana_lookup_pen ~457 tokens
Look up a Private Enterprise Number (PEN). Pass exactly one of `pen` (a number such as 32473, or an OID under 1.3.6.1.4.1 such as 1.3.6.1.4.1.32473.1.2) or `organization` (words matched against organization names). Returns the organization and its OID prefix. Arcs below the enterprise number are ass
iana_lookup_port ~596 tokens
Look up IANA service name and transport protocol port assignments. Pass exactly one of `port` (a number, 0–65535), `service` (an exact service name such as "postgresql"), or `keyword` (words matched against service names and descriptions). Results list every transport (tcp, udp, sctp, dccp) separate
iana_lookup_uri_scheme ~425 tokens
Look up a registered URI scheme. Pass exactly one of `scheme` (e.g. "mailto"; a trailing ":" or "://" is ignored) or `keyword` (words matched against scheme names and descriptions). Returns the status — permanent, provisional, or historical — description, references, and well-known URI support.
iana_search_registries ~363 tokens
Find IANA protocol registries and sub-registries by keyword over their titles and protocol categories, e.g. "tls cipher", "dns resource record", "protocol numbers". Returns the registry and sub-registry ids that iana_get_registry_records reads, with registration procedure and defining documents. Cov

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