Baxter International Inc — 2 prefixes (MA-L)

A MAC address starting with 58:46:E1 or 58:42:E4 belongs to Baxter International Inc, typically seen on networked hospital infusion equipment such as the Sigma Spectrum Infusion Pump and its companion Sigma Wi-Fi Battery module. Baxter is a large, publicly traded (NYSE: BAX) medical-device and healthcare manufacturer headquartered in Deerfield, Illinois.

Both prefixes are ordinary, full MA-L /24 blocks registered directly and solely to Baxter International Inc — neither falls within a shared IEEE base like 70:B3:D5 or 8C:1F:64, so no sub-allocation caveat applies here. Holding two independent OUI assignments is itself a substance signal: single-OUI shell registrants rarely hold more than one block.

Independent security research corroborates Baxter as a real networked-hardware vendor, not a shell registration. Four CVEs (CVE-2022-26390, -26392, -26393, -26394) were published 2022-09-08 against Sigma Spectrum Infusion Pump firmware and the Sigma Wi-Fi Battery, alongside a CISA ICS medical advisory (ICSMA-22-251-01) for the same product line.

the Wireshark manufacturer database third-party list also tags a sub-block, 00:50:C2:2E:00/36, "BaxterIntern," but that block does not appear anywhere in the IEEE MA-S registry (our IEEE-sourced MA-S registry), so it cannot be confirmed against our own registry and is treated as Unknown rather than a fact.

IEEE assignment

2 prefixes → Baxter International Inc, registered Deerfield, IL, US [Confirmed] — the IEEE MA-L registry 5846E1, the IEEE MA-L registry 5842E4

Registry / block size

MA-L (24-bit OUI); 2 confirmed full-block assignments [Confirmed] — the IEEE MA-L registry

HQ / country

One Baxter Parkway, Deerfield, IL 60015, US [Confirmed] — the IEEE MA-L registry 5846E1, 5842E4

Company status

active, publicly traded NYSE: BAX [Likely] — search-result corroboration (baxter.com returned HTTP 403 on direct fetch)

Device types

hospital infusion pumps (Sigma Spectrum, Spectrum IQ, Novum IQ, IQX), Wi-Fi battery modules [Likely] — rapid7.com blog post 2022-09-08

Notable products

Sigma Spectrum Infusion Pump, Sigma Wi-Fi Battery [Likely] — rapid7.com, thehackernews.com 2022-09-08

Verified sample prefixes (both MA-L, Baxter International Inc)

58:46:E1, 58:42:E4 [Confirmed] — the IEEE MA-L registry

Unconfirmed sub-block

00:50:C2:2E:00/36 ("BaxterIntern" per the Wireshark manufacturer database) — not present in the IEEE MA-S registry, so not confirmed [Unknown] — the Wireshark manufacturer database; the IEEE MA-S registry

Special note

Four CVEs (CVE-2022-26390, -26392, -26393, -26394, published 2022-09-08) affect Sigma Spectrum Infusion Pump firmware 8.00.01 and Sigma Wi-Fi Battery firmware 16/17/20 D29; CISA ICSMA-22-251-01 recommends VLAN isolation from other hospital network segments. Not associated with malware/trojan activity as of an August 2026 search.

[Confirmed] — nvd.nist.gov/vuln/detail/CVE-2022-26390, rapid7.com blog post 2022-09-08

Related vendors

Unknown (no subsidiary OUI holders identified) [Unknown]

Analyst note

These two prefixes are Baxter's own directly-registered MA-L blocks, not a shared IEEE base — a MAC starting 58:46:E1 or 58:42:E4 reliably identifies Baxter-registered hardware, consistent with hospital/IoMT deployment context. The manuf-listed /36 sub-block cannot be attributed on our registry data and should not be treated as a confirmed Baxter assignment.