NAKAYO Inc. — 6 prefixes (MA-L)

A MAC address beginning with one of six IEEE-registered prefixes (00:D0:EC, 48:0C:49, 8C:3C:4A, B0:4B:68, C8:07:39, F4:96:51) belongs to NAKAYO Inc, a Japanese business-telephone and PBX equipment manufacturer, and is most likely seen on office VoIP handsets, PBX line/network cards, or business routers rather than consumer devices.

NAKAYO (株式会社ナカヨ) is a longstanding Maebashi, Gunma-based manufacturer — third-party company profiles put it at roughly 729 employees and about $162.97M in revenue, making business-phone and PBX systems with customers including NTT. Holding six separate OUI blocks across two registered addresses is itself corroborating evidence of an active, recurring registrant rather than a shell registration.

All six blocks are MA-L (/24) assignments; no MA-M or MA-S registrations exist for NAKAYO in the cached registries. Two physical addresses alternate across the six: "1-3-2, Soja-machi, Maebashi-shi, Gunma" covers F4:96:51, B0:4B:68, and C8:07:39, while "Development Support Center, 165 Higashiomuro-machi, Maebashi-shi, Gunma" covers 00:D0:EC, 48:0C:49, and 8C:3C:4A. The Wireshark manufacturer database independently confirms all six prefixes as NAKAYO.

IEEE's public OUI data does not publish assignment or registration dates for any of these blocks. One third-party aggregator (maclookup.app) lists an October 3, 2016 "registered" date for F4:96:51 — this is that aggregator's own database artifact, not an IEEE fact, and is not treated as a registration date here.

No Nakayo-specific CVEs or vendor security advisories turned up in a targeted search. That is a sourced absence of findings, not a claim that the vendor's products are free of security issues.

Vendor

NAKAYO Inc. (株式会社ナカヨ) [Confirmed] — the IEEE MA-L registry; https://uic.io/en/mac/vendor/nakayo_inc/

Registry class

MA-L only — no MA-M or MA-S blocks found for NAKAYO [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry

OUI assignments (6)

00:D0:EC, 48:0C:49, 8C:3C:4A, B0:4B:68, C8:07:39, F4:96:51 [Confirmed] — the IEEE MA-L registry (lines 2415, 10756, 11429, 16218, 25946, 33134); cross-checked against the Wireshark manufacturer database

Registered addresses

two — "1-3-2, Soja-machi, Maebashi-shi, Gunma" (F4:96:51, B0:4B:68, C8:07:39) and "Development Support Center, 165 Higashiomuro-machi, Maebashi-shi, Gunma" (00:D0:EC, 48:0C:49, 8C:3C:4A) [Confirmed] — the IEEE MA-L registry

Company profile

founded-era telecom manufacturer, ~729 employees, ~$162.97M revenue, HQ Maebashi, Gunma, Japan [Likely] — https://www.bloomberg.com/profile/company/6715:JP, https://www.dnb.com/business-directory/company-profiles.nakayoinc.35e0f4ebe4f523f5a7f6dfdf1f05735b.html, https://www.zoominfo.com/c/nakayo-inc/372132846

Device class

business PBX/VoIP telephone systems and network routers [Likely] — https://www.nyc.co.jp/products/category_telephone.html, https://device.report/nakayo

Also seen on

business telephone deployments with NTT among named customers [Likely] — https://www.nyc.co.jp/products/category_telephone.html

Registration date

not IEEE-published; one third-party aggregator lists October 3, 2016 for F4:96:51 as its own database artifact, not an IEEE fact [Unknown] — https://maclookup.app/macaddress/f49651

Security advisories

none found in a targeted search [Unknown]