Library of Congress >> MARC >> Community Information >> 8XX  >> 856

856 - Electronic Location and Access (R)

MARC 21 Community Information - concise
December 2020

Contains the information needed to locate and access electronic information pertaining to a community service such as the service or event website or related resources. Subfields $y (Link text) and $z (Public note) may be used to specify the type of electronic information.

Field 856 is repeated when the location data elements vary (the URL in subfield $u or subfields $a and $d, when used). It is also repeated whenever the electronic filename varies (subfield $f), except when a single intellectual item is divided into different parts for online storage or retrieval.

See the Guidelines for the Use of Field 856 for a more thorough discussion on the use of field 856.


First - Access method
# - No information provided
0 - Email
1 - FTP
2 - Remote login (Telnet)
3 - Dial-up
4 - HTTP
7 - Method specified in subfield $2
Second - Relationship
# - No information provided
0 - Resource
1 - Version of resource
2 - Related resource
8 - No display constant generated

Subfield Codes

$a - Host name (R)
Fully qualified domain (host name) of the electronic location. It contains a network address which is repeated if there is more than one address for the same host.
$c - Compression information (R)
Information about the compression of a file; in particular, whether a specific program is required to decompress the file.
$d - Path (R)
$f - Electronic name (R)
$m - Contact for access assistance (R)
$o - Operating system (NR)
$p - Port (NR)
Portion of the address that identifies a process or service in the host.
$q - Electronic format type (NR)
Identification of the electronic format type, which is the data representation of the resource, such as text/html, ASCII, Postscript file, executable application, or JPEG image. Electronic format type may be taken from enumerated lists such as registered Internet Media Types (MIME types).
$s - File size (R)
$u - Uniform Resource Identifier (R)
Uniform Resource Identifier (URI), which provides electronic access data in a standard syntax. Field 856 is structured to allow for the creation of a URL from the concatenation of other separate field 856 subfields. Subfield $u may be used instead of those separate subfields or in addition to them. Subfield $u may be repeated only if both a URN and a URL or more than one URN are recorded.
$v - Hours access method available (R)
$w - Record control number (R)
$x - Nonpublic note (R)
$y - Link text (R)
$z - Public note (R)
$2 - Access method (NR)
Access method when the first indicator position contains value 7 (Method specified in subfield $2). Code from: Electronic Access Methods Code List.
$3 - Materials specified (NR)
$6 - Linkage (NR)
See the description of this subfield in Appendix A: Control Subfields.
$7 - Access status (NR)
Code indicating the availability of access to the remote electronic resource the address of which appears in subfield $u. Subfield $7 applies to all subfields $u present in the field.
$8 - Field link and sequence number (R)
See the description of this subfield in Appendix A: Control Subfields.


856 1#$$cMust be decompressed with PKUNZIP$$s16874 bytes
856 1#$$dmirrors/info-mac/util$fcolor-system-icons.hqx
856 0#$akentvm.bitnet$facadlist file1$facadlist file2$facadlist file3
856 2#$$mRoy Tennant
856 0#$akeptvm.bitnet$facadlist file1$s34,989 bytes$facadlist file2$s32,876 bytes$facadlist file3$s23987 bytes
856 3#$$m[email protected]$vM-F 6:00 a.m.-21:30 p.m. USA EST, Sat. 8:30-17:00 USA EST, Sun. 13:00-17:00 USA EST
856 1#$$cdecompress with PKUNZIP.exe$d/mirrors2/win3/games$$xcannot verify because of transfer difficulty
856 42$3Finding aid$u

Library of Congress >> MARC >> Community Information >> 8XX  >> 856
Contact Us