Mercury Systems – Trusted Mission Solutions, Inc. — 2 prefixes (MA-L)

A MAC address starting with C8:77:8B or 00:80:B6 belongs to Mercury Systems – Trusted Mission Solutions, Inc., typically seen on rugged, embedded defense-computing hardware such as mission computers, OpenVPX processing subsystems, and rack servers rather than consumer devices.

The vendor name traces to Themis Computer, a Fremont, CA maker of ruggedized commercial servers and embedded computers that was a sole-source rack-server supplier on Navy and Army programs. Mercury Systems, Inc. (NASDAQ: MRCY), a publicly traded aerospace/defense manufacturer, agreed to acquire Themis Computer in December 2017, with closing expected by the end of Mercury's fiscal Q3 2018 (by March 31, 2018). The Fremont address on the C8:77:8B registration matches Themis Computer's former headquarters, and the parent's product catalog — including its "Secure" (root-of-trust/cryptography) and "Compute" (OpenVPX, mission computing) lines — is directly consistent with a defense hardware vendor of this profile.

Two separate MA-L blocks are registered under the exact name "Mercury Systems – Trusted Mission Solutions, Inc." in the IEEE registry: C8:77:8B at a Fremont, CA address, and 00:80:B6 at a Pleasanton, CA address. Neither is a shared IEEE Registration Authority block — each is a standard, single-company /24 assignment, so identifying either block's traffic as this vendor's hardware is accurate.

No CVE, ICS-CERT/CISA advisory, or vulnerability disclosure tied to this vendor's hardware or MAC ranges was found as of an August 2026 search. Two unrelated same-name collisions surfaced and should not be attributed here: Microsoft's "MERCURY" tracking name for an Iranian nation-state threat actor, and "Mercury Security Corporation" (a distinct company behind HID/LenelS2 access-control panels, with its own separate OUI 00:0F:E5).

Device class

Rugged/embedded defense computing hardware — mission computers, OpenVPX embedded processing subsystems, rack servers

Registered blocks

C8:77:8B (Fremont, CA), 00:80:B6 (Pleasanton, CA)

Predecessor entity

Themis Computer, Fremont CA rugged-server maker acquired by Mercury Systems (deal announced Dec 2017, expected close by March 31, 2018)

Not to be confused with

Mercury Security Corporation (unrelated OUI 00:0F:E5, HID/LenelS2 access-control panels); the Iranian "MERCURY" APT group (a Microsoft threat-actor tracking name, not a hardware vendor); other unrelated "Mercury"-named OUI holders (Mercury Corporation KR, Mercury Communication Technologies CN, Mercury Computer Systems Inc US pre-rename 00:26:0D, iMercury JP, Mercury HMI Ltd GB)

IEEE assignment

2 prefixes → Mercury Systems – Trusted Mission Solutions, Inc. [Confirmed] — the IEEE MA-L registry C8778B, the IEEE MA-L registry 0080B6

Registry / block size

MA-L (24-bit OUI); 2 IEEE prefixes under this exact registered name [Confirmed] — the IEEE MA-L registry C8778B, the IEEE MA-L registry 0080B6; cross-checked against https://maclookup.app/vendors/mercury-systems-trusted-mission-solutions (independently reports 2 prefixes)

HQ / country

C8:77:8B → 47200 Bayside Pkwy, Fremont, CA 94538, US; 00:80:B6 → 6681 Owens Drive, Pleasanton, CA 94588, US [Confirmed] — the IEEE MA-L registry C8778B, the IEEE MA-L registry 0080B6

Company status

active (federal contractor of record) [Confirmed] — https://www.highergov.com/awardee/mercury-systems-trusted-mission-solutions-inc-10117954/ (UEI K85XUK3ARLX6, NAICS 334111)

Device types

rugged/embedded mission computers, OpenVPX embedded processing subsystems, rack servers, small-form-factor systems, safety-certifiable mission computing boards [Likely] — https://www.mrcy.com/products, https://militaryembedded.com/radar-ew/signal-processing/mercury-systems-agrees-to-acquire-themis-computer

Notable products

"Secure" line (root-of-trust/cryptography, Linux security solutions), "Data Management" (data-at-rest encryption), "Compute" line (OpenVPX, mission/airborne computers) [Confirmed] — https://www.mrcy.com/products

Verified sample prefixes (both MA-L, this exact registered name)

C8:77:8B, 00:80:B6 [Confirmed] — the IEEE MA-L registry C8778B, the IEEE MA-L registry 0080B6

Predecessor entity

Themis Computer, Fremont CA rugged-server/embedded-computer maker, sole-source rack-server supplier on Navy/Army programs; acquired by Mercury Systems, Inc., deal announced Dec 2017, closing expected by Mercury FY2018 Q3 (by March 31, 2018) [Confirmed] — https://ir.mrcy.com/news-releases/news-release-details/mercury-systems-acquire-themis-computer, https://militaryembedded.com/radar-ew/signal-processing/mercury-systems-agrees-to-acquire-themis-computer

Registration date

Unknown — IEEE's public OUI data publishes no assignment-date field. A third-party aggregator (maclookup.app) separately shows "First Seen 2000-11-09" / "Last Modified 2018-02-15" for this listing, which is a database-scrape artifact of that aggregator, not an IEEE fact

[Unknown / not an IEEE fact] — https://maclookup.app/vendors/mercury-systems-trusted-mission-solutions

Security context

no CVE, ICS-CERT/CISA advisory, or vulnerability disclosure tied to this vendor's hardware or MAC ranges found as of an August 2026 search; do not conflate with the Iranian "MERCURY" APT tracking name or with Mercury Security Corporation's access-control CVEs [Likely] — https://www.microsoft.com/en-us/security/blog/2022/08/25/mercury-leveraging-log4j-2-vulnerabilities-in-unpatched-systems-to-target-israeli-organizations/, https://www.cisa.gov/news-events/ics-advisories/icsa-22-153-01

Related vendors

Mercury Systems, Inc. (parent, NASDAQ: MRCY); Mercury Security Corporation (unrelated, separate OUI 00:0F:E5) [Confirmed] — the IEEE MA-L registry 000FE5

Analyst note

Both blocks are standard single-company /24 assignments (not shared IEEE bases), so identifying C8:77:8B or 00:80:B6 traffic as this vendor's hardware is accurate; do not extend that identification to other, legally separate "Mercury"-named OUI holders or to unrelated same-name security incidents.