- IPN
- Instituto Politécnico Nacional (International » Mexican)** Instant Payment Notification (Business » Accounting)* Interpenetrating Polymer Network (Miscellaneous » Plastics)* Interplanetary Internet (Computing » Networking)* Institut Pédagogique National (Regional » African)* Independent Photography Network (Business » General)* Idaho Physicians Network (Medical » Hospitals)* Instant Purchase Notification (Business » Stock Exchange)* Inter Penetrating Network (Computing » Networking)* Intelligence Processing Network (Governmental » Military)* Ipatinga, Minas Gerais, Brazil (Regional » Airport Codes)* Insane Props Nation (Miscellaneous » Funnies)
Abbreviations dictionary. 2012.