apache2 (8)          - Apache Hypertext Transfer Protocol Server
ata_rwcmd_protocol (9) - set taskfile r/w commands and protocol
Class::MOP (3pm)     - A Meta Object Protocol for Perl 5
ddp (7)              - Linux AppleTalk protocol implementation
dev_change_proto_down (9) - update protocol port state information
dhclient (8)         - Dynamic Host Configuration Protocol Client
dhcp-options (5)     - Dynamic Host Configuration Protocol options
dict (1)             - DICT Protocol Client
dict_lookup (1)      - DICT Protocol Client
endprotoent (3)      - get protocol entry
eth_proto_is_802_3 (9) - Determine if a given Ethertype/length is a protocol
eth_type_trans (9)   - determine the packet's protocol ID.
getnameinfo (3)      - address-to-name translation in protocol-independent ma...
getprotobyname (3)   - get protocol entry
getprotobyname_r (3) - get protocol entry (reentrant)
getprotobynumber (3) - get protocol entry
getprotobynumber_r (3) - get protocol entry (reentrant)
getprotoent (3)      - get protocol entry
getprotoent_r (3)    - get protocol entry (reentrant)
git-send-pack (1)    - Push objects over Git protocol to another repository
HTTP::Server::Simple::CGI::Environment (3pm) - a HTTP::Server::Simple mixin t...
i2c_smbus_read_block_data (9) - SMBus “block read” protocol
i2c_smbus_read_byte (9) - SMBus “receive byte” protocol
i2c_smbus_read_byte_data (9) - SMBus “read byte” protocol
i2c_smbus_read_word_data (9) - SMBus “read word” protocol
i2c_smbus_write_block_data (9) - SMBus “block write” protocol
i2c_smbus_write_byte (9) - SMBus “send byte” protocol
i2c_smbus_write_byte_data (9) - SMBus “write byte” protocol
i2c_smbus_write_word_data (9) - SMBus “write word” protocol
i2c_smbus_xfer (9)   - execute SMBus protocol operations
ip (7)               - Linux IPv4 protocol implementation
ip-address (8)       - protocol address management
ip-addrlabel (8)     - protocol address label management
ipv6 (7)             - Linux IPv6 protocol implementation
LWP::Protocol (3pm)  - Base class for LWP protocols
LWP::Protocol::https (3pm) - Provide https support for LWP::UserAgent
Mail::Server::IMAP4::Fetch (3pm) - message info for IMAP protocol speed-up
Mail::SpamAssassin::Client (3pm) - Client for spamd Protocol
Moose::Cookbook::Basics::HTTP_Subtype... (3pm) - Demonstrates subtypes and co...
mpt_deregister (9)   - Deregister a protocol drivers resources.
mpt_event_deregister (9) - Deregister protocol-specific event callback handler
mpt_event_register (9) - Register protocol-specific event callback handler.
mpt_put_msg_frame (9) - Send a protocol-specific MPT request frame to an IOC
mpt_put_msg_frame_hi_pri (9) - Send a hi-pri protocol-specific MPT request frame
mpt_register (9)     - Register protocol-specific main callback handler.
mpt_reset_deregister (9) - Deregister protocol-specific IOC reset handler.
mpt_reset_register (9) - Register protocol-specific IOC reset handler.
ncftp (1)            - Browser program for the File Transfer Protocol
ncftp3 (1)           - Browser program for the File Transfer Protocol
Net::DNS::Packet (3pm) - DNS protocol packet
Net::POP3 (3perl)    - Post Office Protocol 3 Client class (RFC1939)
Net::Server::Proto (3pm) - Net::Server Protocol compatibility layer
Net::Server::Proto::SSL (3pm) - Net::Server SSL protocol.
Net::Server::Proto::SSLEAY (3pm) - Custom Net::Server SSL protocol handler ba...
Net::Server::Proto::TCP (3pm) - Net::Server TCP protocol.
Net::Server::Proto::UDP (3pm) - Net::Server UDP protocol.
Net::Server::Proto::UNIX (3pm) - Net::Server UNIX protocol.
Net::Server::Proto::UNIXDGRAM (3pm) - Net::Server UNIXDGRAM protocol.
Net::SMTP (3perl)    - Simple Mail Transfer Protocol Client
Net::SSH2 (3pm)      - Support for the SSH 2 protocol via libssh2.
ocsp (1ssl)          - Online Certificate Status Protocol utility
pnp_register_protocol (9) - adds a pnp protocol to the pnp layer
pnp_unregister_protocol (9) - removes a pnp protocol from the pnp layer
protocols (5)        - protocols definition file
pure-ftpd (8)        - simple File Transfer Protocol server
pure-ftpd-virtualchroot (8) - simple File Transfer Protocol server
rmt (8)              - remote magtape protocol module
rmt-tar (8)          - remote magtape protocol module
rpc_protocol (9)     - Get transport protocol number for an RPC client
rpcgen (1)           - an RPC protocol compiler
setprotoent (3)      - get protocol entry
skb_segment (9)      - Perform protocol segmentation on skb.
sock_register (9)    - add a socket protocol handler
sock_unregister (9)  - remove a protocol handler
SSL_CTX_set_msg_callback (3ssl) - install callback for observing protocol mes...
SSL_CTX_set_msg_callback_arg (3ssl) - install callback for observing protocol...
SSL_get_msg_callback_arg (3ssl) - install callback for observing protocol mes...
SSL_get_version (3ssl) - get the protocol version of a connection.
SSL_set_msg_callback (3ssl) - install callback for observing protocol messages
struct_spi_driver (9) - Host side “protocol” driver
TAP::Parser::Grammar (3perl) - A grammar for the Test Anything Protocol.
tcp (7)              - TCP protocol
tcp_table (5)        - Postfix client/server table lookup protocol
telnet (1)           - user interface to the TELNET protocol
telnet.netkit (1)    - user interface to the TELNET protocol
udp (7)              - User Datagram Protocol for IPv4
udplite (7)          - Lightweight User Datagram Protocol
USB_DEVICE_INTERFACE_PROTOCOL (9) - describe a usb device with a specific int...
X11::Protocol (3pm)  - Perl module for the X Window System Protocol, version 11
X11::Protocol::Connection (3pm) - Perl module abstract base class for X11 cli...
X11::Protocol::Connection::FileHandle (3pm) - Perl module base class for File...
X11::Protocol::Connection::INETFH (3pm) - Perl module for FileHandle-based TC...
X11::Protocol::Connection::INETSocket (3pm) - Perl module for IO::Socket::INE...
X11::Protocol::Connection::Socket (3pm) - Perl module base class for IO::Sock...
X11::Protocol::Connection::UNIXFH (3pm) - Perl module for FileHandle-based Un...
X11::Protocol::Connection::UNIXSocket (3pm) - Perl module for IO::Socket::UNI...
X11::Protocol::Ext::BIG_REQUESTS (3pm) - Perl module for the X11 protocol Big...
X11::Protocol::Ext::DPMS (3pm) - Perl module for the X11 Protocol DPMS Extension
X11::Protocol::Ext::RENDER (3pm) - Perl module for the X Rendering Extension
X11::Protocol::Ext::SHAPE (3pm) - Perl module for the X11 Protocol Nonrectang...
X11::Protocol::Ext::XC_MISC (3pm) - Perl module for the X11 Protocol XC-MISC ...
X11::Protocol::Ext::XFree86_Misc (3pm) - Perl module for the XFree86 Misc Ext...
x25 (7)              - ITU-T X.25 / ISO-8208 protocol interface.