This subfield contains the host address. It is repeatable when there are more addresses available for one host.

It can contain the Internet Protocol (IP) numeric address if the item is an Internet resource or a telephone number if dial-up access is provided through telephone line. This data may change frequently and may be generated by the system. A telephone number is recorded as follows: [country code]-[area code]-[telephone number], e.g. 49-69-15251140 (a number in Frankfurt, Germany), 1-202-7076237 (a number in the U.S., Washington, D.C.). If an extension is applicable, include it after the telephone number preceded by "x", e.g. 1-703-3589800x515 (a telephone number with extension).

This subfield is used when special software is required for data decompression.

The name of directory/subdirectory is entered where the file is located.

The time in the form YYYYMMDDHHMM, at which the electronic item was last accessed.

The electronic name of a file is entered as it exists in the directory/subdirectory indicated in subfield d on the host identified in subfield a. Subfield f may be repeated if a single logical file has been divided into parts and stored under different names. In this case, the separate parts should constitute a single bibliographic item. In all other cases, a file that may be retrieved under different filenames contains multiple occurrences of field 856, each with its corresponding electronic name in subfield f. A filename may include wildcard characters (e.g. "*" or "?") if applicable, with a note in subfield z explaining how files are named. Filenames may be case sensitive for some systems.

This subfield may also contain the name of the electronic publication or conference.

The Uniform Resource Name (URN) is entered which provides a globally unique location independent identifier.

The username or processor of the request is entered in this subfield; generally the data which precedes the at sign "@" in the host address.

An instruction or command is entered, needed for the remote host to process a request.

The lowest and highest number of bits of data that can be transmitted per second when connected to a host. The syntax for recording the number of bits per second should be: [Lowest BPS]-[Highest BPS]. If only lowest given: [Lowest BPS]-. If only highest given: -[Highest BPS].

Used to record general-use password, and should not contain passwords requiring security.

General-use logon/login strings which do not require special security.

The address or a contact person is entered for access assistance.

The location of the host stated in subfield a is entered.

For information, the operating sysem used by the host specified in subfield a is entered in this subfield.

The portion of the address that identifies a process or service in the host.

This subfield contains an identification of the electronic format type (e.g. text/HTML, ASCII, postscript, computer program – exe or JPEG). The information is designated for the end users to determine how data are transferred through a network and how they can be used or be read (e.g. what software or hardware is required for the file to be displayed). Usually, a text file can be transferred as character data which generally restricts the text to characters in the ASCII character set (i.e. the basic Latin script, digits 0-9, a few special characters, and most punctuation marks). Text files with characters outside of the ASCII set, or non textual data (e.g. computer programs, image data) must be transferred using another file transfer mode, usually binary mode. Electronic format type may be taken from lists such as registered Internet Media types (MIME types).

The settings used for transferring data are entered. Included settings are:

The syntax of these elements is: [Parity]-[Number of Data Bits]-[Number of Stop Bits]. If only the parity is given, the other elements or settings and their related hyphens are omitted (i.e. [Parity]). If one of the other two elements is given, the hyphen for the missing element is recorded in its proper position, i.e. [Parity]--[Number of Stop Bits] or [Parity]-[Number of Data Bits]-. The values for parity are: O (Odd), E (Even), N (None), S (Space) and M (Mark).

The size of the file is entered as stored under the filename indicated in subfield f. It is generally expressed in terms of 8-bit bytes. Subfield may be repeated in cases where the filename is repeated and directly follows the subfield f to which it applies.

The emulation of the terminal is entered in this field.

The URL (Uniform Resource Locator) is entered which provides data in standard syntax needed for the electronic access. With URL address the electronic item should be located using existing Internet protocols (see examples).

The hours are entered that access to an electronic resource is available at the location indicated in this field.

A control number of the record is entered in this subfield.

The information by cataloguers that is not suitable for library users.

The access method when the first indicator position contains value "7". This subfield may include access methods other than the main TCP/IP protocols specified in the first indicator. The data in this subfield corresponds to the access schemes specified in Uniform Resource Locators (URL) (RFC 1738), a product of the Uniform Resource Identifiers Working Group of the IETF. The Internet Assigned Numbers Authority (IANA) maintains a registry of URL schemes and defines the syntax and use of new schemes.

Notes are entered that are suitable to be displayed for the library users.