The vendor-valcom entry is a slug collision: two legally distinct manufacturers named "Valcom" each hold their own IEEE MA-L block, and both names normalize to valcom once the site's slugify logic strips punctuation and corporate stopwords ("co", "ltd", "inc"). The site's generate-oui-pages.js therefore groups them under a single vendor page with two prefixes — but the companies make completely different hardware, so the page must keep them clearly separated rather than blending them. Prefix 00:D0:5F belongs to VALCOM, INC. of Roanoke, Virginia (founded 1977), a maker of IP and analog paging, intercom, mass-notification, and emergency-communications systems — IP loudspeakers, SIP paging gateways, zone-page controllers, and visual alerting strobes, all designed and assembled in Roanoke and deployed mainly in K–12 schools, hospitals, and government facilities. Prefix 40:B0:A1 belongs to VALCOM CO.,LTD. of Toyonaka City, Osaka, Japan (founded February 1984), a precision-instruments firm making pressure sensors, load cells, and digital indicators — an entirely different OT/industrial device class. The practical consequence for anyone classifying a MAC: a 00:D0:5F address is almost certainly a network-attached paging or intercom endpoint, while a 40:B0:A1 address is most likely an industrial pressure or load instrument. No CVEs or CISA advisories were found for either entity. As always for OUI entries, IEEE publishes no registration date — third-party "registered 2000" figures for 00:D0:5F are database artifacts, not IEEE facts.
valcom under the site's slugify (strips punctuation + stopwords co/ltd/inc), so generate-oui-pages.js groups them as one vendor page with two prefixes. No Valcom matches in mam.csv (MA-M) or oui36.csv (MA-S). [Confirmed] — enrichment/registries/oui.csv