"IBM (alt) Hilton code N2666284 is a secondary IBM code. IBM has multiple Hilton codes reflecting IBM's global corporate travel volume. The same FlyerTalk-documented enforcement pattern applies: "mostly never asked for ID" but with exceptions at gateway properties and a significant increase in European enforcement since 2022. IBM employee ID is a standard photo badge that Hilton staff recognize. The "alt" code likely targets specific IBM business units or international travel corridors."

"I don't know what will happen if these hotels, car rental companies, or other providers start asking for corporate identification. It seems problematic. Hopefully it will be that only a few locations, of a few brands, are demanding identification and for a specific reason."

"I've only ever been asked about it once and I basically said "Yes I work there" and there were no follow up questions. That was on a personal trip but booked through the portal Hilton set up that allows employees to book personal travel using the corporate rate."