Section 4 of the manual describes special files (devices).
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- ng_ppp
- PPP protocol netgraph node type
- ng_pppoe
- RFC 2516 PPPoE protocol netgraph node type
- ng_pptpgre
- PPTP GRE protocol netgraph node type
- ng_pred1
- Predictor-1 PPP compression (RFC 1978) netgraph node type
- ng_rfc1490
- RFC 1490 netgraph node type
- ng_socket
- netgraph socket node type
- ng_source
- netgraph node for traffic generation
- ng_split
- netgraph node to separate incoming and outgoing flows
- ng_sppp
- sppp netgraph node type
- ng_sscfu
- netgraph SSCF at the UNI node type
- ng_sscop
- netgraph SSCOP node type
- ng_tag
- mbuf tags manipulating netgraph node type
- ng_tcpmss
- netgraph node to adjust TCP MSS option
- ng_tee
- netgraph ``tee'' node type
- ng_tty
- netgraph node type that is also a TTY hook
- ng_ubt
- Netgraph node type that is also a driver for Bluetooth USB devices
- ng_uni
- netgraph UNI node type
- ng_vjc
- Van Jacobson compression netgraph node type
- ng_vlan
- IEEE 802.1Q VLAN tagging netgraph node type
- ngatmbase
- netgraph ATM utility module
- nge
- National Semiconductor PCI Gigabit Ethernet adapter driver
- nmdm
- nullmodem terminal driver
- nouveau
- NVIDIA video driver
- npx
- Numeric Processing Extension coprocessor
- nsp
- Workbit Ninja SCSI-3 based PC-Card SCSI host adapter driver
- null
- null, zero - data sink
- null
- the null device
- numa
- NUMA — Non-Uniform Memory Access
- nvd
- NVM Express disk driver
- nvme
- NVM Express core driver
- nvram
- non-volatile RAM
- oce
- Device driver for Emulex OneConnect 10Gb network adapters
- ocs_fc
- Device driver for Emulex Fibre Channel Host Adapters
- ohci
- OHCI USB Host Controller driver
- onewire
- ow — Dallas Semiconductor 1-Wire bus
- openchrome
- video driver for VIA Unichromes
- opie
- OPIE - One-time Passwords In Everything
- orm
- ISA I/O space option ROM(s) driver
- otus
- Atheros AR9170 USB IEEE 802.11a/b/g/n wireless network device
- otusfw
- Firmware Module for AR9170 driver
- ow
- Dallas Semiconductor 1-Wire bus
- ow_temp
- Dallas Semiconductor 1-Wire Temperature sensor
- owc
- Dallas Semiconductor 1-Wire Controller
- padlock
- driver for the cryptographic functions and RNG in VIA C3, C7 and Eden processors
- pae
- PAE — Physical Address Extensions
- pass
- CAM application passthrough driver
- pbio
- 8255 parallel peripheral interface basic I/O driver
- pccard
- PC Card bus driver
- pccbb
- cardbus bridge driver
- pcf
- Philips I2C bus controller
- pci
- generic PCI bus driver
- pcib
- PCI bridge driver
- pcic
- PC Card bridge driver
- pcm
- sound , pcm , snd — FreeBSD PCM audio device infrastructure
- pcn
- AMD PCnet/PCI Fast Ethernet device driver
- pdb
- PDB - (Pilot Database) file format
- perfmon
- CPU performance-monitoring interface
- pf
- packet filter
- pflog
- packet filter logging interface
- pfsync
- packet filter state table sychronisation interface
- pim
- Protocol Independent Multicast
- plip
- lp — printer port Internet Protocol driver
- pms
- PMC-Sierra PM8001/8081/8088/8089/8074/8076/8077 SAS/SATA HBA Controller driver
- pmspcv
- pms — PMC-Sierra PM8001/8081/8088/8089/8074/8076/8077 SAS/SATA HBA Controller driver
- pnfs
- pNFS — NFS Version 4.1 Parallel NFS Protocol
- pnfsserver
- pNFSserver — NFS Version 4.1 Parallel NFS Protocol Server
- pnp
- support for “Plug and Play” (PnP) ISA devices
- pnpbios
- support for embedded devices on the motherboard
- polling
- device polling support
- port
- mem, kmem, port - system memory, kernel memory and system ports
- ppbus
- Parallel Port Bus system
- ppc
- Parallel Port Chipset driver
- ppi
- user-space interface to ppbus parallel 'geek' port
- procdesc
- process descriptor facility
- proto
- Generic prototyping and diagnostics driver
- psm
- PS/2 mouse style pointing device driver
- pst
- device driver for Promise Supertrak SX6000
- pt
- SCSI processor type driver
- ptmx
- ptmx, pts - pseudoterminal master and slave
- ptnet
- Ethernet driver for passed-through netmap ports
- pts
- ptmx, pts - pseudoterminal master and slave
- pts
- pseudo-terminal driver
- pty
- old-style compatibility pseudo-terminal driver
- puc
- PCI “Universal” Communications driver
- pwmc
- PWM (Pulse Width Modulation) control device driver
- r128
- ATI Rage 128 video driver
- radeon
- ATI/AMD RADEON video driver
- ral
- Ralink Technology IEEE 802.11a/g/n wireless network device
- ram
- ram disk device
- random
- random, urandom - kernel random number source devices
- random
- the entropy device
- range
- index range for a subset of a vector (rheolef-7.2)
- rawip
- ip — Internet Protocol
- rc
- RISCom/8 multiport card
- rctl
- resource limits
- re
- RealTek 8139C+/8169/816xS/811xS/8168/810xE/8111 PCI/PCIe Ethernet adapter driver
- rgephy
- RealTek RTL8168/8169/8110/8211 series 10/100/1000 Gigabit Ethernet PHY driver
- rights
- Capability rights — Capsicum capability rights for file descriptors
- rl
- RealTek 8129/8139 Fast Ethernet device driver
- rndtest
- FIPS 140-2 random number generator test monitor