Crate macaddr_ouidb 

macaddr-ouidb

High-performance MAC address OUI (Organizationally Unique Identifier) lookup library, supporting manufacturer information lookup from MAC addresses.

Features

• 🚀 Zero-Cost Abstraction: Compile-time generated lookup tables, only binary search at runtime
• 💾 Memory Efficient: Columnar storage + compact encoding, full database only 900KB
• ⚡ Fast Lookup: O(log n) time complexity, supports 24/28/36-bit OUI
• 🔍 Comprehensive Coverage: Contains 38,000+ OUI-24 entries, 6,000+ OUI-28 entries, 6,000+ OUI-36 entries
• 🎯 Virtual NIC Detection: Built-in common virtualization platform NIC recognition (VMware, QEMU, VirtualBox, OpenStack, etc.)
• 📦 Flexible Integration: Supports serde serialization, optional pnet interoperability
• 🔒 no_std Support: Works in no_std environments (optional features for std)

Quick Start

Basic Usage

use macaddr_ouidb::MacAddress;
use std::str::FromStr;

// Create a MAC address
let mac = MacAddress::from_str("00:55:DA:0A:BB:CC").unwrap();

// Lookup manufacturer information
match mac.oui() {
    Some(org_name) => println!("Manufacturer: {}", org_name),
    None => println!("OUI information not found"),
}

// Check if virtual NIC
if mac.is_virtual_nic() {
    println!("This is a virtual NIC: {}", mac.oui().unwrap_or("Unknown"));
}

// Check address type
println!("Unicast: {}", mac.is_unicast());
println!("Universal: {}", mac.is_universal());

Serde Support

After enabling the serde feature, JSON serialization is supported:

use macaddr_ouidb::MacAddress;
use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize)]
struct Device {
    mac: MacAddress,
    name: String,
}

API Documentation

MacAddress

Ethernet MAC address type (6 bytes).

use macaddr_ouidb::MacAddress;
use std::str::FromStr;

// Constructors
let mac = MacAddress::new([0x00, 0x11, 0x22, 0x33, 0x44, 0x55]);
let mac = MacAddress::new6(0x00, 0x11, 0x22, 0x33, 0x44, 0x55);
let mac: MacAddress = "00:11:22:33:44:55".parse().unwrap();
let mac: MacAddress = "00-11-22-33-44-55".parse().unwrap();
let bytes = [0x00, 0x11, 0x22, 0x33, 0x44, 0x55];
let mac = MacAddress::from_slice(&bytes).unwrap();
let zero = MacAddress::zero();
let broadcast = MacAddress::broadcast();

// Property checks
let mac: MacAddress = "00:11:22:33:44:55".parse().unwrap();
assert!(mac.is_unicast());
assert!(!mac.is_multicast());
assert!(!mac.is_broadcast());
assert!(mac.is_universal());
assert!(!mac.is_local());
assert!(!mac.is_zero());

// Methods
let octets = mac.octets();           // [u8; 6]
let value = mac.to_u64();            // u64
let oui = mac.oui();                 // Option<&'static str>
let is_virtual = mac.is_virtual_nic(); // bool

Data Format

Supports three OUI types:

Type	Bits	Format	Description
OUI-24 (MA-L)	24	XX:XX:XX	Legacy assignment, first 3 bytes
OUI-28 (MA-M)	28	XX:XX:XX:X	Medium-sized, first 3 bytes + high 4 bits of 4th byte
OUI-36 (MA-S)	36	XX:XX:XX:XX:X	Small-sized, first 4 bytes + high 4 bits of 5th byte

Automatically matches the most precise type during lookup.

Data Source

OUI data comes from the nmap-mac-prefixes file of the Nmap project, which integrates IEEE official OUI assignment data.

Data is automatically generated at compile time via build.rs, ensuring:

• Consistency with source code version
• No runtime loading required
• Zero initialization overhead

Features

Feature	Description	Default
std	Enable std library support	Yes
serde	Enable serde serialization	Yes
pnet	Enable pnet interoperability	Yes
ma-s	Enable 36-bit OUI (MA-S) support	Yes

no_std Support

This crate supports no_std environments. To use it in a no_std environment, disable default features:

[dependencies]
macaddr-ouidb = { version = "0.1", default-features = false }

CLI Tool

The crate includes a CLI tool mac-oui for querying MAC address information:

$ cargo run --bin mac-oui -- 00:55:DA:0A:BB:CC
MAC Address: 00:55:da:0a:bb:cc
Formatted:   00:55:da:0a:bb:cc
Octets:      00-55-DA-0A-BB-CC

Address Type:
  Unicast:     Yes
  Multicast:   No
  Broadcast:   No
  Universal:   Yes
  Local:       No

Organization: Shinko Technos

Performance

• Lookup Time: O(log n) binary search
• Memory Usage: ~1.7MB for full database (38,000+ OUI-24, 6,000+ OUI-28, 6,000+ OUI-36 entries)
• Initialization: Zero runtime initialization (compile-time generated)

License

Apache-2.0

Contributing

Issues and Pull Requests are welcome!

Structs

MacAddress

Mac Address

OuiDb

Organizationally Unique Identifiers (OUI) database

Enums

ParseMacError

Constants

ETHER_ADDR_LEN

The number of bytes in an ethernet (MAC) address.

OUI_DB

Global static instance of OuiDb