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NTP RFC 5905 / SNTP Leap Second & Epoch Decoder

Decode an NTP/SNTP 48-byte packet: LI/VN/Mode bitfield, stratum, poll, precision, root delay/dispersion, reference ID (with clock & kiss codes), and four 64-bit 1900-epoch timestamps

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/ntp-rfc-5905-sntp-leap-second-epoch-decoder' \
  -H 'Content-Type: application/json' \
  -d '{"hex":"24 01 0c fa 000005e4 0000059c 47505300 eb5c3a80 00000000 eb5c3a90 00000000 eb5c3aa0 00000000 eb5c3ab0 00000000","mode":"decode"}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/ntp-rfc-5905-sntp-leap-second-epoch-decoder

Parameters

Name	Type	Required	Description
hex	textarea	No	—
mode	select	No	—

Response format

HTML result

JSON

{
  "result": "<div>Processed HTML content</div>",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-ntp-rfc-5905-sntp-leap-second-epoch-decoder": {
      "name": "ntp-rfc-5905-sntp-leap-second-epoch-decoder",
      "description": "Decode an NTP/SNTP 48-byte packet: LI/VN/Mode bitfield, stratum, poll, precision, root delay/dispersion, reference ID (with clock & kiss codes), and four 64-bit 1900-epoch timestamps",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=ntp-rfc-5905-sntp-leap-second-epoch-decoder",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "ntp-rfc-5905-sntp-leap-second-epoch-decoder",
    "arguments": {
  "hex": "24 01 0c fa 000005e4 0000059c 47505300 eb5c3a80 00000000 eb5c3a90 00000000 eb5c3aa0 00000000 eb5c3ab0 00000000",
  "mode": "decode"
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

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