Advantage Controls — E4:38:F2 (MA-L)

The OUI prefix E4:38:F2 is registered to Advantage Controls at the registry address 4700 Harold Abitz Dr., Muskogee, OK 74403, US. It is a single MA-L (24-bit) block — no other Advantage Controls assignments were found in the MA-M (the IEEE MA-M registry) or MA-S (the IEEE MA-S registry) tiers, so this one block is the vendor's entire IEEE footprint. Advantage Controls is a family-owned water-treatment equipment manufacturer based in Muskogee, Oklahoma, with a 30-plus-year operating history, making chemical-feed and controller hardware for cooling towers and boilers under named, still-marketed product lines including MegaTron, NanoTron, and Microtron. The company's WebAdvantage service provides cloud-based remote monitoring specifically for "internet connected MegaTron controllers," which is a coherent, concrete explanation for why an industrial-controls manufacturer of this size holds an Ethernet/Wi-Fi MAC block: its controllers phone home over the internet rather than operating purely standalone on-site. That combination — an independently verifiable company with a corporate website and local business listing, named product lines, and a documented device/connectivity use case — is what distinguishes this from a bare, unexplained single-OUI shell registration. As with any OUI lookup, third-party "registration date" claims should be treated skeptically here: two independent aggregators return conflicting dates for the same block (2013/2015 vs. 2016), which itself demonstrates the figures are non-IEEE database artifacts rather than a verifiable assignment date.

IEEE assignment

E4:38:F2 → Advantage Controls, registered Muskogee, OK, US [Confirmed] — the IEEE MA-L registry; corroborated the Wireshark manufacturer database

Registry / block size

MA-L (24-bit OUI, ~16.7M addresses); single block, only IEEE prefix found for this org — no MA-M or MA-S hits [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry (no match)

HQ / address

4700 Harold Abitz Dr., Muskogee, OK 74403, US (registry address) [Confirmed] — the IEEE MA-L registry, cross-corroborated at https://maclookup.app/vendors/advantage-controls, https://uic.io/en/mac/address/e438f2/, https://www.yellowpages.com/muskogee-ok/mip/advantage-controls-11942112

Company status / substance

active; family-owned water-treatment equipment manufacturer, Muskogee OK, 30+ years in business — SUBSTANTIVE, not a shell registration [Confirmed] — https://www.advantagecontrols.com/, https://www.yellowpages.com/muskogee-ok/mip/advantage-controls-11942112

Device types

industrial water-treatment controllers — MegaTron, NanoTron, and Microtron series — plus the WebAdvantage cloud remote-monitoring service for internet-connected MegaTron controllers [Confirmed] — https://www.advantagecontrols.com/

Number of OUI blocks

only one MA-L block located for this company across the aggregators checked; no second block found [Likely] — https://maclookup.app/vendors/advantage-controls, https://uic.io/en/mac/address/e438f2/

Registration date caveat

not attributable to IEEE — third-party aggregators conflict (maclookup.app: first registered 2013-03-28, updated 2015-11-17; uic.io: registration date 2016-08-05); direct fetch of standards-oui.ieee.org was blocked (HTTP 418), so no first-party IEEE date confirmation was obtainable; IEEE's own the IEEE MA-L registry publishes no date field at all, so neither figure is recorded as fact

[Unknown] — https://maclookup.app/vendors/advantage-controls, https://uic.io/en/mac/address/e438f2/

IANA reference

not applicable to a MAC-vendor (OUI) registry entry; left blank [Confirmed] — n/a

Analyst note

an E4:38:F2 globally-administered MAC identifies genuine Advantage Controls water-treatment control hardware (e.g. an internet-connected MegaTron controller reporting to WebAdvantage), not a generic consumer endpoint.