official service name port number protocol name aliases
Items are separated by any number of blanks and/or tab characters. The port number and protocol name are considered a single item; a slash (``/'') is used to separate the port and protocol (e.g. ``512/tcp''). A hash (``#'') indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file.
Service names may contain any printable character other than a field delimiter, newline, or comment character.
The database in /var/db/services.db needs to be updated with services_mkdb(8) after changes to the services file have been applied.
/etc/services
/etc
.