"IBM (US) Hilton code 0901452 is the domestic US IBM Hilton code. Same enforcement profile as the International IBM code: low US domestic verification rate (well under 10%) but higher at airport corridor properties known for corporate code abuse enforcement. London and European Hilton properties significantly increased enforcement post-2022. IBM's massive employee headcount and Hilton partnership status means the code is deeply embedded in Hilton's GDS system with occasional automated audit flags for first-time users."

"- Marriott (CORP): Please be prepared to show proof of eligibility for your rate (such as a membership card, corporate or government identification card, or proof of your age). - Marriott (GOV): Federal Govt issued Visa, MasterCard, American Express, or Federal Govt picture ID (CAC or Common Access Card) - Hilton (CORP): No ID requirements listed - Hilton (GOV): Id-travel orders required at checkin"

"I run a Consultancy and work with clients across both Public and Private sectors. Many years ago (15?) a UK Government client (they are still an active client) shared a Hilton Corporate Code, which was to be used for stays required when working with them. This code gives access to (but not 'On Duty' rates). I use this code regularly across the UK (mainly London) without issue, staying most months at various London Hiltons."