MRV Comunications — 2 prefixes (MA-L)

A MAC address beginning with 44:37:08 or DC:4D:23 belongs to "MRV Comunications" — spelled with a single "m" in the IEEE registry — a networking-equipment registrant based in Yokneam, Israel. Both blocks carry the identical organization name and address, so this is one registrant holding two MA-L assignments, not a single isolated block.

The Yokneam address matches the one used by a separately-registered IEEE entry, "MRV Communications (Networks) LTD," which holds four other MA-L blocks (00:0F:BD, 00:16:69, 3C:A7:2B, A4:60:32) and is documented as the Israel-based engineering arm of MRV Communications, Inc. The shared street address is suggestive of the same physical facility, but the registry treats the two org-name strings as distinct entries, and no source directly confirms they are the same legal registration rather than a duplicate or variant filing.

MRV Communications, Inc. itself is a well-documented, formerly NASDAQ-listed (MRVC) telecom/networking equipment maker founded in 1988 in Chatsworth, California, with named product lines including OptiSwitch carrier Ethernet switches, LambdaDriver optical transport gear, and InReach/LX-series out-of-band console servers. ADVA Optical Networking acquired it for roughly $69 million in a deal that closed August 2017; ADVA was later absorbed into ADTRAN Holdings via a 2022 merger.

Because no source ties these two specific prefixes to a named product model, device attribution here is inferential from the shared Yokneam facility and the broader MRV corporate family rather than directly confirmed. No CVE or malware association for MRV Communications was found in an NVD search as of 2026-08-09.

Registrant

MRV Comunications (misspelled in registry) [Confirmed] — the IEEE MA-L registry 443708, the IEEE MA-L registry DC4D23

Device class

Unknown for these two prefixes specifically; likely carrier/enterprise networking hardware by analogy to the same-address "MRV Communications (Networks) LTD" registrant's OptiSwitch/LambdaDriver/InReach lines [Likely] — the IEEE MA-L registry 443708

Also seen on

No independent third-party MAC lookup source was checked to confirm real-world device sightings for these exact two prefixes [Unknown]

Related registration (same address, separate registry entry)

MRV Communications (Networks) LTD, 4 MA-L blocks, Yokneam, Israel [Confirmed] — the IEEE MA-L registry

Related registration (distinct entity, US address)

MRV Communications, Inc., Chatsworth, CA, separate OUI 00:20:1A [Confirmed] — the IEEE MA-L registry

Parent corporate history

founded 1988, formerly NASDAQ: MRVC, acquired by ADVA Optical Networking (~$69M, closed 2017-08-14), ADVA later merged into ADTRAN Holdings (2022) [Confirmed] — https://www.prnewswire.com/news-releases/mrv-communications-inc-announces-agreement-to-be-acquired-by-adva-optical-networking-300482934.html, https://en.wikipedia.org/wiki/MRV_Communications

IEEE assignment

2 MA-L prefixes → "MRV Comunications" (registry spelling), Yokneam, IL [Confirmed] — the IEEE MA-L registry 443708, the IEEE MA-L registry DC4D23

Prefixes in scope

44:37:08, DC:4D:23 [Confirmed] — the IEEE MA-L registry 443708, the IEEE MA-L registry DC4D23

Registry classes

MA-L only; no MA-M or MA-S entries found for this org name [Confirmed] — the IEEE MA-L registry, the IEEE MA-S registry

HQ / country

"Hayetzira Yokneam IL 614" (registry address string is incomplete/malformed — no street number, non-standard postal formatting) [Confirmed, artifact flagged] — the IEEE MA-L registry 443708

Registration date

Unknown — IEEE's public OUI data publishes no assignment/registration date for MAC prefixes; not fabricated here [Confirmed absence] — the IEEE MA-L registry

Relationship to sibling registrations

same Yokneam address as "MRV Communications (Networks) LTD" (4 separate MA-L blocks) but a distinct registry org-name string; also distinct from the US-domiciled "MRV Communications, Inc." (Chatsworth, CA, OUI 00:20:1A) [Confirmed as distinct registry rows; same-facility inference is Likely, not proven] — the IEEE MA-L registry

Company status

parent MRV Communications, Inc. (NASDAQ: MRVC, founded 1988) acquired by ADVA Optical Networking for ~$69M, deal closed 2017-08-14; ADVA later absorbed into ADTRAN Holdings via a 2022 merger [Confirmed] — https://www.prnewswire.com/news-releases/mrv-communications-inc-announces-agreement-to-be-acquired-by-adva-optical-networking-300482934.html, https://en.wikipedia.org/wiki/MRV_Communications

Device types

not independently confirmed for these two prefixes; the broader MRV corporate family (same address as one sibling registration) ships carrier Ethernet switches, optical transport, and out-of-band console servers [Likely] — the IEEE MA-L registry 443708

Notable products

none confirmed specific to 44:37:08 / DC:4D:23 [Unknown]

Security/CVE exposure

no CVE or malware association found for MRV Communications as of an NVD CPE-database search on 2026-08-09 [Confirmed negative] — https://nvd.nist.gov/products/cpe/search/results?keyword=mrv%20communications

Website

mrv.com does not currently resolve (DNS lookup failure observed 2026-08-09), consistent with the domain being defunct after the 2017 ADVA acquisition [Likely] — https://en.wikipedia.org/wiki/MRV_Communications

Related vendors

MRV Communications (Networks) LTD (same Yokneam address, separate registry entry); MRV Communications, Inc. (US entity, Chatsworth, CA, separate OUI); ADVA Optical Networking (acquirer, 2017); ADTRAN Holdings (parent via 2022 ADVA merger)

Analyst note

treat this as a related-but-distinct registration from the "(Networks) LTD" and US "Inc." MRV entries — do not merge their confirmed product lines onto these two prefixes without a direct source; the corporate-family link is Likely, not Confirmed.