Anritsu — 2 prefixes (MA-L)

Anritsu holds two distinct IEEE MA-L blocks registered under closely related but non-identical organization strings: 00:00:91 to "ANRITSU CORPORATION" (registry address "1800, ONNA", Japan) and 00:02:B1 to "Anritsu, Ltd." (registry address "Rutherford Close, United Kingdom"). The two names are not merged in the IEEE data — one is the Japanese parent, the other the UK-registered subsidiary, and the Rutherford Close / Stevenage address lines up with Anritsu's known EMEA operation. Anritsu Corporation is a longstanding public Japanese electronics company (founded 1895, HQ Kanagawa, listed on the Tokyo Stock Exchange as 6754.T), best known as a global test-and-measurement vendor: vector network analyzers, spectrum analyzers, base-station and mobile simulators, optical and IP/Ethernet test instruments, plus food and pharmaceutical quality-assurance systems. The OUIs identify genuine networked lab and field instruments rather than a shell registration — a point reinforced by a real vendor-specific security advisory. A useful data-quality caveat: third-party MAC-lookup sites display an "Initial registration: 09 November 2000" date for BOTH prefixes identically, which is a database-population artifact, not an IEEE-published fact — IEEE's public OUI data carries no registration or assignment date at all, so no date should be surfaced as an IEEE registration date on any per-prefix page.

IEEE assignment (prefix 1)

00:00:91 → "ANRITSU CORPORATION", registry address "1800, ONNA", Japan [Confirmed] — IEEE MA-L

IEEE assignment (prefix 2)

00:02:B1 → "Anritsu, Ltd.", registry address "Rutherford Close, United Kingdom" [Confirmed] — IEEE MA-L

Registry / block size

MA-L (24-bit OUI); 2 IEEE prefixes total. No matches in MA-M (the IEEE MA-M registry) or MA-S (the IEEE MA-S registry). [Confirmed] — IEEE MA-L (the IEEE MA-L registry / the IEEE MA-M registry / the IEEE MA-S registry). NOTE: IEEE public OUI data publishes NO assignment/registration date (columns are only Registry, Assignment, Organization Name, Organization Address); any "date registered" on third-party tools is a database artifact, not an IEEE fact.

HQ / country

Anritsu Corporation, Atsugi/Kanagawa, Japan (parent); Anritsu EMEA / UK subsidiary at Stevenage, matching the Rutherford Close registry line. [Confirmed] — anritsu.com, UK Companies House

Company status

active; publicly traded, Tokyo Stock Exchange ticker 6754.T; founded 1895 [Confirmed] — anritsu.com, finance.yahoo.com (6754.T)

Device types

test-and-measurement instruments — vector/network analyzers, spectrum analyzers, base-station & mobile simulators, optical test sets, IP/Ethernet testers, Remote Spectrum Monitor line (MS27100A/MS27101A/MS27102A/MS27103A) [Confirmed for product existence; Likely that these specific networked lines populate the OUIs] — anritsu.com test-measurement product pages

Notable products

Remote Spectrum Monitor series, IP/Ethernet testers, vector network analyzers; also food/pharma quality-assurance systems

Security context

CISA ICS advisory ICSA-26-090-01 (CVE-2026-3356) describes an authentication-bypass / no-authentication-mechanism design flaw in the Anritsu Remote Spectrum Monitor line (MS27100A, MS27101A, MS27102A, MS27103A, all versions); a network-adjacent attacker could alter settings, read signal data, or disrupt availability. Sectors: Communications, Defense Industrial Base, Emergency Services, Transportation. No known public exploitation reported to CISA at advisory time. [Likely — search-summary sourced; a direct cisa.gov fetch returned HTTP 403, so fine details are pending direct-page confirmation] — cisa.gov ICSA-26-090-01

Registration date

Unknown — IEEE publishes no OUI registration/assignment date; the "09 November 2000" shown on maclookup.app for both prefixes is a third-party database artifact (identical on both prefixes), NOT an IEEE fact, and must not be recorded or surfaced as one.

[Confirmed as artifact] — maclookup.app (flag only)

IANA reference

none — IEEE OUI assignments have no IANA RFC reference; field stays blank.

Analyst note

A globally-administered Anritsu OUI on an address reliably indicates genuine Anritsu test/measurement hardware. Two blocks under parent + UK-subsidiary names is expected for a company of this footprint; do not merge the two exact org strings into a composite.