自制Python网络扫描器OUI厂商信息仅显示8字符，求问题排查

你遇到的OUI厂商信息仅显示8个字符，核心原因是manuf库的get_manuf方法默认返回短厂商名称（最多8字符），该方法的full_manuf参数默认值为False，会自动截断厂商名称。

修复步骤 #

1. 获取完整厂商名称
   修改get_device_type函数，调用get_manuf时传入full_manuf=True参数，即可获取完整的厂商名称：

def get_device_type(mac_address):
    p = manuf.MacParser()
    manufacturer = p.get_manuf(mac_address, full_manuf=True)
    return manufacturer or "Unknown"

2. 优化性能（可选但推荐）
   将MacParser实例移到函数外部，避免每次调用get_device_type都重复加载数据库，提升扫描效率：

# 全局初始化一次MacParser
p = manuf.MacParser()

def get_device_type(mac_address):
    manufacturer = p.get_manuf(mac_address, full_manuf=True)
    return manufacturer or "Unknown"

3. 调整打印格式
   使用格式化字符串的对齐语法，确保各列内容完整显示，避免因长度差异导致的视觉截断：
   将循环内的打印语句修改为：

print(f"{ip:<16} {mac:<18} {device_type:<30} {os_info}")

完整修改后的代码 #

import scapy.all as scapy
import manuf

# 全局初始化MacParser，避免重复加载数据库
p = manuf.MacParser()

def get_device_type(mac_address):
    # 获取完整厂商名称
    manufacturer = p.get_manuf(mac_address, full_manuf=True)
    return manufacturer or "Unknown"


def scan(ip):
    print("Sending ARP requests...")
    arp_request = scapy.ARP(pdst=ip)
    broadcast = scapy.Ether(dst="ff:ff:ff:ff:ff:ff")
    arp_request_broadcast = broadcast / arp_request
    answered_list = scapy.srp(arp_request_broadcast, timeout=1, verbose=False)[0]
    
    print("\nIP Address\tMAC Address\t\tManufacturer\t\t\t\tOS\n---------------------------------------------------------------------------------------------------------------")
    
    for element in answered_list:
        ip = element[1].psrc
        mac = element[1].hwsrc
        device_type = get_device_type(mac)
        os_info = "Unknown"
        try:
            syn_packet = scapy.IP(dst=ip) / scapy.TCP(dport=80, flags="S")
            response = scapy.sr1(syn_packet, timeout=1, verbose=False)
            if response and response.haslayer(scapy.TCP):
                tcp_flags = response.getlayer(scapy.TCP).flags
                os_info = "Linux/Unix" if tcp_flags == 0x12 else "Windows" if tcp_flags == 0x14 else "Unknown"
        except Exception:
            os_info = "Error"
        # 格式化对齐列，确保内容完整显示
        print(f"{ip:<16} {mac:<18} {device_type:<30} {os_info}")
    print("\nDone\n---------------------------------------------------------------------------------------------------------------")

scan("192.168.42.1/24")

内容的提问来源于stack exchange，提问作者Lardsonian