Cyber Metadata · MAC Vendor Lookup
Enter a MAC address or OUI prefix (at least 6 hex digits) to find the IEEE-registered vendor; randomized and multicast addresses are flagged explicitly.
Cyber Metadata · MAC Vendor Lookup
Enter a MAC address or OUI prefix (at least 6 hex digits) to find the IEEE-registered vendor; randomized and multicast addresses are flagged explicitly.
MAC 地址 / OUI 厂商查询——输入完整 MAC 或前 6 位十六进制，返回 IEEE 注册的制造商、注册粒度与国别， 并识别随机化（本地管理）地址与组播地址。
IEEE 把 MAC 空间按三种粒度出售：MA-L（/24）、MA-M（/28）、MA-S（/36）。小厂与物联网芯片商常常只买 /28、/36 的小块——这些小块挂在 IEEE 持有的共享 /24 下，只查前 6 位会把它们全部错标成 「IEEE Registration Authority」。本工具按 /36 → /28 → /24 依次匹配，CID（公司标识符）单独标注为非全球唯一。
IEEE 官方注册库（MA-L / MA-M / MA-S / IAB / CID 五张表，约 5.8 万条分配记录），按最长前缀匹配：/36 优先于 /28、/24——很多小厂/物联网芯片只有细粒度注册，直接查 /24 会错标成 IEEE。
现代手机连 Wi-Fi 默认使用随机化 MAC（第一字节的本地管理位置位），注册库无法反映真实硬件——这是隐私特性，不是查询错误。本工具会明确标注这类地址。
用浏览器抓包分析：上传同网段的 .pcap / .pcapng，本地设备清单会自动列出每个 MAC 的厂商、角色（网关/终端）与流量——MAC 全程不离开你的浏览器。
MAC address / OUI vendor lookup — paste a full MAC or its first 6 hex digits to get the IEEE-registered manufacturer, registry granularity and country, with explicit flags for randomized (locally-administered) and multicast addresses.
IEEE sells MAC space at three granularities: MA-L (/24), MA-M (/28) and MA-S (/36). Small and IoT vendors often hold only a /28 or /36 carved out of an IEEE-owned shared /24 — a naive 6-digit lookup labels them all "IEEE Registration Authority". This tool matches /36 → /28 → /24, and flags CID (Company ID) hits as non-unique.
The official IEEE registries (MA-L / MA-M / MA-S / IAB / CID, ~58k assignments), matched longest-prefix first: /36 beats /28 beats /24 — many small IoT vendors only hold fine-grained blocks, and a naive /24 lookup would mislabel them as IEEE.
Modern phones randomize their Wi-Fi MAC by default (the locally-administered bit is set), so the registry cannot reveal the real hardware — a privacy feature, not a lookup failure. The tool flags these addresses explicitly.
Use the in-browser PCAP analysis: upload a same-segment .pcap / .pcapng and the LAN device inventory lists each MAC's vendor, role (gateway/endpoint) and traffic — MACs never leave your browser.