Cardiac Recorders, Inc. — 2 prefixes (MA-L)

A MAC address starting with 00:9D:8E or 02:9D:8E belongs to Cardiac Recorders, Inc., a UK-registered organization holding two IEEE MA-L blocks. On a modern network scan this OUI is far more likely to trace to legacy medical instrumentation than to IT or consumer networking hardware.

IEEE's public registry lists both blocks under the same organization name and the same registered address, 34 Scarboro Road, United Kingdom, with no further corporate detail included in the assignment record itself.

Independent research through the FDA's openFDA database ties the "Cardiac Recorders" name to eight 510(k) device clearances issued between September 1985 and March 1987, filed under "Cardiac Recorders, Ltd." of London, GB. Cleared product lines include the "Cardiorater" ECG/cardiac monitor (product code DRT) and the "Cardian" cardiac DC defibrillator (product code LDD).

No live vendor-operated website, no CVE, and no security advisory naming Cardiac Recorders, Cardiorater, or Cardian were found as of an August 2026 search — consistent with a dormant or long-absorbed 1960s-1980s era manufacturer. A UK Companies House filing (number 00595048) surfaced only in a search-result snippet; the detail page returned an access error, so active/dissolved status is not independently confirmed.

IEEE assignment

2 prefixes → Cardiac Recorders, Inc., registered 34 Scarboro Road, United Kingdom [Confirmed] — the IEEE MA-L registry MA-L 009D8E, MA-L 029D8E

Registry / block size

MA-L (24-bit OUI); 2 IEEE prefixes (00:9D:8E, 02:9D:8E) [Confirmed] — the IEEE MA-L registry MA-L 009D8E, MA-L 029D8E

HQ / country

34 Scarboro Road, United Kingdom (registry address; no further corporate detail located) [Confirmed] — the IEEE MA-L registry MA-L 009D8E

Company status

Unknown — no live vendor website found; consistent with a dormant legacy manufacturer; UK Companies House number 00595048 surfaced only in an unverified search snippet, detail page inaccessible (403) [Unknown] — https://www.filmmedical.co.uk/props/cardiac-recorders-ecg-machine-P3331.html

Device types

ECG/cardiac monitors ("Cardiorater," product code DRT), cardiac DC defibrillators ("Cardian," product code LDD) [Confirmed] — https://api.fda.gov/device/510k.json?search=applicant:%22cardiac+recorders%22&limit=10

Notable products

Cardiorater, Cardian [Confirmed] — FDA 510(k) database (openFDA)

Verified sample prefixes (both MA-L, Cardiac Recorders, Inc.)

00:9D:8E, 02:9D:8E [Confirmed] — the IEEE MA-L registry

Regulatory history

8 FDA 510(k) clearances, 1985-09-16 through 1987-03-20, filed under "Cardiac Recorders, Ltd." of London, GB [Confirmed] — https://api.fda.gov/device/510k.json?search=applicant:%22cardiac+recorders%22&limit=10

Date attribution caveat

IEEE's public OUI data carries no assignment/registration date for these blocks; the only dates on record are FDA 510(k) clearance dates (1985-1987), a US regulatory source unrelated to MAC/OUI registration [Confirmed] — the IEEE MA-L registry, FDA 510(k) database

Special note

No CVE or security advisory found naming Cardiac Recorders, Cardiorater, or Cardian as of an August 2026 search [Likely] — general CVE/web search, absence of results

Related vendors

None found — no MA-M or MA-S sub-block entries under this organization name [Confirmed] — the IEEE MA-M registry, the IEEE MA-S registry

Analyst note

A MAC beginning 00:9D:8E or 02:9D:8E indicates Cardiac Recorders, Inc. hardware — historically medical/cardiac monitoring and defibrillator equipment rather than IT networking gear; treat as a legacy medical-device signature, not consumer/enterprise networking.