| Picton | Airport Code |
| Pameco Corporation | Business |
| PACRIM International Capital, Inc. (de-listed 2012) | Business |
| Price Change Notification | Business |
| Pioneer Career Network | Business |
| Principal Certification Network | Certifications |
| Personnel Certification In Non | Certifications |
| Personal Conference Number | Community |
| Pilipino Cultural Night | Community |
| Popular Communications News | Community |
| Pennsylvania Cable Network | Community |
| Pilipino Culture Night | Community |
| Pacific Coast News | Community |
| PACTV Community News | Community |
| Pro Clubs Nation | Community |
| Pacific Cultural Night | Community |
| Philippine Culture Night | Community |
| Personal Communications Network | Computer and Networking |
| Personal Communication Network | Computing |
| Preferred Connection Network | Computing |
| Pc Network | Computing |
| Public Communications Network | Computing |
| Packet Core Network | Computing |
| Path Control Network | Computing |
| Path Change Notification | Computing |
| Public Cellular Network | Computing |
| Pitcairn | Country ISO Code |
| PeepCoin | Cryptocurrency |
| PhoenixChain | Cryptocurrency |
| Personal Communication and Network | Electronics |
| Prior Coordination Notice | General |
| Policy Clarification Notice | General |
| Personal Cellular Network | General |
| Public Carrier Networks | General |
| Primary Care Neuropsychiatry | General |
| Pavement Classification Number | General |
| Permafrost Carbon Network | General |
| Product Change Notices | General |
| Penalty Charge Notices | General |
| Professional Communications Network | General |
| Peer Connection Network | General |
| Point Completion Network | General |
| Poison Centre Notifications | General |
| Process Control Number | General |
| Parent Country National | General |
| Pilot Car Network | General |
| Porsche Club News | General |
| Pontiac Club Norway | General |
| Part Change Notification | General |
| Pre Congestion Notification | General |
| Production Change Notice | General |
| Process Change Notification | General |
| Porsche Club Norge | General |
| Preassigned Control Number | General |
| Post Crash Notification | General |
| Parking Charge Notice | General |
| Peugeot Club Nederland | General |
| Porsche Club Normandie | General |
| Porsche Club Nurburgring | General |
| Pre construction Notification | General |
| Process Chain Network | General |
| Penalty Charge Notice | General |
| Personnel Coordinating Networks | General |
| Porous Coordination Network | General |
| Product Change Notification | General |
| Professional Communications | General |
| Processor Control Number | General |
| Prise De Courant Normale | General |
| Perinatal Care Network | General |
| Priority Corridor Network | General |
| Pale Cyst Nematode | General |
| Pro Citrus Network | General |
| Public Customer Number | General |
| Product Change Notifications | General |
| Pacific Coast Native | Governmental |
| Property Control Number | Governmental |
| Primary Care Network | Healthcare |
| PANCH PIPILA | Indian Railway Station |
| Pediatric Care Network | Medical |
| Posterior Contralateral Negativity | Medical |
| Psychiatry and Clinical Neurosciences | Medical |
| Pregnancy Childbirth and the Newborn | Medical |
| Preferred College of Nursing | Medical |
| Product Control Number | Military and Defence |
| Process Control Network | Networking |
| Polling Card Number | Networking |
| Physics Computer Network | Physics Related |
| Point Comfort and Northern Railway | Regional |
| Picton, New Zealand | Regional |
| Page Change Notice | Space Science |
| Program Change Notice | Space Science |
| Program Control Number | Space Science |
| Pokemon Center Network | Sports |
| Parent Communication Network | Telecommunication |
