MAC Address Lookup
Find the organization behind a MAC address or OUI prefix in the IEEE registries. No auth, no key.
Should I use this
Quality & Safety
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"mcp": {
"url": "https://mac.jasontally.com/mcp"
}
}
}Remote endpoints
https://mac.jasontally.com/mcpstreamable-httpWhat it can do
Tool inventory
Tools (1)
🟢lookup(mac)
Resolve a MAC address or OUI prefix to its registered organization using longest-prefix match across the MA-L, MA-M, MA-S, IAB, and CID registries. Reports the block type, address count, registration country, and a link to the full record page. Randomized and locally administered addresses usually have no registered organization.
Input Schema
{
"type": "object",
"properties": {
"mac": {
"type": "string",
"description": "MAC address or OUI prefix, 6 to 12 hex characters. Accepts colon, hyphen, Cisco dot, or plain hex, for example 8C:1F:64:AF:A4:B2 or 8C1F64."
}
},
"required": [
"mac"
],
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "The normalized query, colon-separated."
},
"prefix": {
"type": [
"string",
"null"
],
"description": "Longest registered prefix that matched."
},
"blockType": {
"type": [
"string",
"null"
],
"description": "MA-L, MA-M, MA-S, IAB, or CID."
},
"addressCount": {
"type": [
"number",
"null"
],
"description": "Addresses in the matched block."
},
"orgName": {
"type": [
"string",
"null"
],
"description": "Registered organization name."
},
"country": {
"type": [
"string",
"null"
],
"description": "ISO 3166-1 alpha-2 registration country."
},
"locallyAdministered": {
"type": "boolean",
"description": "The bit pattern marks the address locally administered, which usually means a randomized or virtual-machine address. Present only when there is no match."
},
"multicast": {
"type": "boolean",
"description": "The bit pattern marks the address a multicast group. Present only when there is no match."
},
"url": {
"type": "string",
"description": "Record page on https://mac.jasontally.com."
}
},
"required": [
"query",
"prefix",
"url"
]
}Community
Evidence