
Use our free service to get MARC 21 data from the British Library's catalogue, the British National Bibliography or the English Short Title Catalogue (ESTC).
Our free MARC 21 Service is used in more than 130 countries. Users include school and public libraries, universities, researchers.
Users are required to register for the service and agree that any usage will be strictly for non-commercial purposes, such as:
- Resource discovery
- Learning, teaching, academic and scientific research or private study
- Cataloguing or acquisition
- Provision of information solely about the registered library’s holdings for inclusion in a union catalogue or library inter-lending database
- Verification of bibliographic information and/or identification of materials for order via interlibrary loan, from document vendors or from other sources from which materials identified may be purchased or otherwise acquired
Please see the full terms and conditions - if you can agree to these, contact metadata@bl.uk to confirm that you accept them. We will then register you and send out connection details along with a username and password.
How to access and configure the Z39.50 databases
In order to access our Z39.50 databases you will need to use a Z39.50 client. These are incorporated in commercial Library Management Systems, or you can choose to install a standalone client such as:
If you just need to access our catalogues online, please see a list of available catalogues.
Basic configuration settings
In order to access the free authenticated MARC 21 service, ensure your client uses the following configuration details:
- Domain Name: z3950cat.bl.uk
- Port Number: 9909
- Database Names: ZBLACU for the British Library catalogue, BNB03U for the British National Bibliography, or ZESTC for the English Short Title Catalogue
- Record Format: MARC 21
- Character Encoding: Unicode (UTF-8)
- Element Set Name: F (Full) or B (Brief)
Z39.50 Attributes
The following attributes from the BIB-1 semantics are supported by our MARC 21 server:
USE (1) | |
Word Searching | Use Value |
Personal name | 1 |
Title | 4 |
Series title | 5 |
ISBN | 7 |
ISSN | 8 |
British National Bibliography number (only on BNB03U) | 10 |
Local control number | 12 |
DDC (Dewey Decimal Classification) | 13 |
Subject heading (other) | 21 |
LCSH (Library of Congress Subject Heading) | 27 |
Date | 30 |
Date of publication | 31 |
British National Bibliography number (only on BNB03U) | 48 |
Place of publication | 59 |
Author | 1003 |
Author name personal | 1004 |
Any | 1016 |
Server choice | 1017 |
Publisher | 1018 |
ISMN (International Standard Music Number) | 1092 |
Browse Searching | Use Value |
Personal name | 1 |
Title | 4 |
Series title | 5 |
ISBN | 7 |
ISSN | 8 |
British National Bibliography number (only on BNB03U) | 10 |
Local control number | 12 |
DDC (Dewey Decimal Classification) | 13 |
Subject heading (other) | 21 |
LCSH (Library of Congress Subject Heading) | 27 |
British National Bibliography number (only on BNB03U) | 48 |
Place of publication | 59 |
Author | 1003 |
Author name personal | 1004 |
Publisher | 1018 |
ISMN (International Standard Music Number) | 1092 |
Sorting | Use Value |
Personal name | 1 |
Title | 4 |
Date | 30 |
Date of publication | 31 |
Author | 1003 |
Relation (2) | 3 (equal) |
Position (3) |
1 (first in field), 3 (any position in field) |
Structure (4) | 1 (phrase), 2 (word), 6 (word list) |
Truncation (5) |
1 (right truncation), 2 (left truncation), 100 (do not truncate) |
Completeness (6) |
1 (incomplete sub-field), 3 (complete field) |
Share this page
Please consider the environment before printing