Japan Radio Co., Ltd. (JRC) — 2 prefixes (MA-L)

A MAC address starting with 70:88:4D or 18:4F:5D belongs to Japan Radio Co., Ltd. (JRC), a Japanese electronics manufacturer, and typically appears on shipboard marine navigation and communication equipment such as radar, ECDIS chart systems, AIS transponders, and voyage data recorders.

Two separate IEEE MA-L blocks normalize to this vendor slug. The first, 70:88:4D, is registered to "JAPAN RADIO CO., LTD." at a Mitaka-shi, Tokyo address. The second, 18:4F:5D, is registered to "Japan Radio Co., Ltd" at a later Nakano-ku, Tokyo address, consistent with a corporate relocation between the two filings.

JRC, founded in December 1915, is a well-documented company with an active corporate site and a Wikipedia entry. Its core business is marine electronics: JRC's own product pages describe LAN-networked radar, ECDIS, AIS, and VDR equipment intended for integration on a ship's bridge network, which grounds the device-type identification beyond guesswork.

One legitimate CVE names Japan Radio hardware. CVE-2013-6035 (NVD, published 2014-02-04, CVSSv2 base score 10.0) found that JRC's JUE-250 and JUE-500 Inmarsat satellite terminals, along with several other vendors' SATCOM gear, accepted unauthenticated sessions on TCP port 1827. No further Japan Radio Co.-specific CVEs are recorded in the NVD as of an August 2026 keyword search.

Do not confuse this entry with other similarly named IEEE registrants. "JAPAN RADIO COMPANY,LABORATORY," "Nagano Japan Radio Co., Ltd.," and "New Japan Radio Co., Ltd" are separate registrations under different vendor slugs. New Japan Radio's block sits under the shared IEEE base 70:B3:D5, which has thousands of unrelated sub-registrants and belongs to no single vendor.

IEEE assignment

70:88:4D → JAPAN RADIO CO., LTD., registered Mitaka-shi, Tokyo, JP [Confirmed] — the IEEE MA-L registry 70884D

IEEE assignment

18:4F:5D → Japan Radio Co., Ltd, registered Nakano-ku, Tokyo, JP [Confirmed] — the IEEE MA-L registry 184F5D

Registry / block size

MA-L (24-bit OUI) each; two separate IEEE MA-L assignments normalize to this vendor slug under the project's slugify rule [Confirmed] — the IEEE MA-L registry

HQ / country

5-1-1 Shimorenjyaku, Mitaka-shi, Tokyo 181-8510, JP (70:88:4D filing); Nakano Central Park East 10-1, Nakano 4-chome, Nakano-ku, Tokyo 164-8570, JP (18:4F:5D filing, a later address consistent with an HQ relocation) [Confirmed] — the IEEE MA-L registry

Company status

active — jrc.co.jp is a live corporate site [Confirmed] — https://www.jrc.co.jp/en/

Device types

marine radar (JMR series), ECDIS/chart systems (JAN series), AIS transponders, Voyage Data Recorders, GMDSS distress/safety radio, satellite communication terminals [Confirmed] — https://www.jrc.co.jp/en/marine-products-and-systems

Notable products

JAN-9201/7201 ECDIS, JHS-183 AIS transponder, JCY-1900 VDR, JUE-250/JUE-500 Inmarsat satellite terminals [Confirmed] — https://www.jrc.co.jp/en/product/jan9201_7201, https://www.jrc.co.jp/en/product/jhs183, https://www.jrc.co.jp/en/product/jcy1900, https://nvd.nist.gov/vuln/detail/CVE-2013-6035

Verified sample prefixes

70:88:4D, 18:4F:5D [Confirmed] — the IEEE MA-L registry 70884D, the IEEE MA-L registry 184F5D

Company founding

JRC founded December 1915 [Confirmed] — https://en.wikipedia.org/wiki/Japan_Radio_Company. No historic pre-1998-style block or exact OUI assignment date is documented for this vendor; IEEE's the IEEE MA-L registry publishes no assignment-date field at all [Unknown] — the IEEE MA-L registry

Special note

maclookup.app lists third-party "registration" dates (70:88:4D: 03 December 2015; 18:4F:5D: 06 October 2020) — these are maclookup.app database artifacts, not IEEE facts, and must not be presented as IEEE assignment dates

[Confirmed] — https://maclookup.app/macaddress/70884D, https://maclookup.app/macaddress/184F5D

Related vendors (do not conflate)

JAPAN RADIO COMPANY,LABORATORY (assignment 000027, separate slug japan-radio-laboratory); Nagano Japan Radio Co., Ltd. (assignment 000109, separate slug nagano-japan-radio); New Japan Radio Co., Ltd (MA-S sub-allocation 70:B3:D5:AF:3/36 under the shared IEEE-administered base 70:B3:D5, separate slug new-japan-radio, now part of Nisshinbo Micro Devices)

[Confirmed] — the IEEE MA-L registry, the IEEE MA-S registry

Security note

CVE-2013-6035 (NVD, published 2014-02-04, CVSSv2 10.0) names Japan Radio's JUE-250 and JUE-500 Inmarsat terminals among several vendors' SATCOM firmware lacking authentication on TCP port 1827 [Confirmed] — https://nvd.nist.gov/vuln/detail/CVE-2013-6035. No further Japan Radio Co.-specific CVEs are recorded in the NVD as of an August 2026 keyword search

[Confirmed negative] — https://services.nvd.nist.gov/rest/json/cves/2.0?keywordSearch=Japan%20Radio%20Co

Analyst note

two confirmed OUI blocks plus an identifiable, actively operating company with documented marine-electronics product lines give this vendor verifiable substance beyond a bare IEEE registration; do not extend the "Japan Radio" identity to the separately-registered entities listed above

[Confirmed] — the IEEE MA-L registry, https://www.jrc.co.jp/en/, https://en.wikipedia.org/wiki/Japan_Radio_Company