This page will be updated from time to time.

Monday, May 19, 2025, 2:00 to 5:00 (JST)

Due to network maintenance, the following online resources and services
may be temporarily unstable.
We apologize for the inconvenience and appreciate your understanding
and cooperation.

Services Affected:
UTokyo OPAC（Including ASK and MyOPAC services)
The University of Tokyo Doctorial Dissertation Database
Database of the Tibetan Tripitaka Card Catalog
Catalog of Classical Chinese Books in the General Library of the
University of Tokyo
Digital Version of Rare Books（Kanze Archive）
Collection Images on the UTokyo Digital Archive Portal

[April 21, 2025: Restored]
As of 9:00, Monday, April 21, 2025
There is a problem accessing UTokyo Repository.

[February 19, 2025 13:50: Restored]
As of 13:00, Wednesday, February 19, 2025
The UTokyo OPAC is experiencing the following response speed slowdowns.
・Display of the top screen
・Search response
・Display after authentication in MyOPAC

[February 3, 2025: Restored]
As of 11:00, Monday, February 3, 2025
There is a problem accessing the "UTokyo repository".

[December 17, 2024: Restored]
As of 16:00, Wednesday, December 11, 2024
The Bibliography of British and Irish History Online (BBIH) is experiencing a problem with off-campus access via EZproxy.

[November 1, 2024: Restored]
As of November 1, 2024
The University of Tokyo Library OPAC is experiencing a problem with some materials not being found in searches.
If you cannot find the material by searching in OPAC, please try to search in CiNii Books as well, just to be sure.
If you would like to reserve a book that is not found on OPAC but is available at the University of Tokyo library, please visit the counter.

[October 28, 2024: Restored]
As of October 17, 2024
Search errors may occur in the "PubMed 検索機能 (PubMed Search Function)"of the Ichushi-Web.
The search error has the following patterns.
(1) The search is not performed and an error message is displayed.
(2) The search is performed and the number of hits is displayed, but the bibliography of the search result is not displayed.
(3) The bibliography is displayed in the search results, but the full-text link icon is not displayed.
Please try searching again when a search error occurs.

[October 28, 2024: Restored]
As of October 17, 2024
The NLM is experiencing problems. This may cause searches in PubMed and PMC to take longer than usual.

[October 28, 2024 9:10: Restored]
As of 8:30, October 28, 2024
The University of Tokyo Library OPAC is experiencing a problem where searches cannot be performed.

[September 24, 2024: Restored]
As of September 22, 2024
UTokyo OPAC is experiencing access problems. If you encounter a privacy error screen when accessing UTokyo OPAC via your browser, please follow the steps below to display the screen:
1. When you see a message such as “Your connection is not private” or “This connection is not secure,” click on “Advanced” within the screen.
2. Click on “Proceed to opac.dl.itc.u-tokyo.ac.jp (unsafe).”

[September 19, 2024: Restored]
As of September 18, 2024
UTokyo Repository is experiencing access problems.
You may be able to access the site, but the page is very slow to be displayed. Please wait while the page is loading (the blue circle on the upper left and the blue bar at the top).
If the screen does not appear, please reload your browser.

[July 22, 2024: Restored]
As of July 19, 2024
E-journal & E-book Portal and UTokyo Article Link are not available. Access to content via UTokyo Article Link from database search results is also unavailable.

→We have not been able to confirm that the EJ & EB Portal and UTokyo Article Link have been restored, but it appears that they are now accessible. You may continue to use those that are still accessible, but please be aware that there is a possibility that issues may occur again.

[July 9, 2024: Restored]
As of July 5, 2024
Some materials in the OPAC are not showing up in the search results. Please try CiNii Books (https://ci.nii.ac.jp/books/) just to be sure. If you cannot reserve books from MyOPAC due to this problem, please go to the counter.

[July 3, 2024: Restored]
As of July 2, 2024
There is a problem that the papers in 2024 of Nature platform cannot be browsed (both on and off-campus). Papers published before 2023 and SpringerLINK e-journals and e-books are available.

Wednesday, April 16, 2025, 14:00 to 15:00 (JST)
Due to maintenance, the search service for written contents of Asahi Shimbun Cross Search will be unavailable.
・Asahi Graph (optional) Your search will return 0 results.
*Services other than the above, such as article search, are available.

Wednesday 9, April 2025, 19:00 - 19:15 (JST)
"KinoDen" and "bREADER Cloud" will be suspended for maintenance.

Saturday 5, April 2025, 18:00 - 18:30 (JST)
"KinoDen" and "bREADER Cloud" will be suspended for maintenance.

Wednesday, March 12, 2025, 9:00 - 11:00 (JST)
UTokyo OPAC  (including ASK Service and MyOPAC service) will be suspended for maintenance. 
※Even if a connection is established during this time, it may stop accessing the site.

Saturday, March 8, 2025, 10:00 - 13:00 (JST)
The "JapanKnowledge Lib" will be suspended for maintenance.

Tuesday, February 25, 2025, 9:00 - 14:00 (JST)
The "UTokyo Repository" will be suspended for maintenance.

Sunday, February 16, 2025, 16:00 - 18:00 (JST)
E-journal & E-book Portal and UTokyo Article Link will be suspended for maintenance. Access to content via UTokyo Article Link from database search results will also be unavailable.

Thursday, January 30, 2025, 18:00 to 19:30 (JST).
The "Asahi Shimbun Cross-Search" will switch over the authentication system.
There will be no service interruption, but the session of the service you are using will be disconnected at the time of the switch. Please note that you will need to re-login.

Sunday, January 19, 2025, 16:00 - 18:00 (JST)
E-journal & E-book Portal and UTokyo Article Link will be suspended for maintenance. Access to content via UTokyo Article Link from database search results will also be unavailable.

Sunday, January 12, 2025, 2:00 - 3:00 (JST)
Due to system maintenance, the University of Tokyo Library System website will be unavailable.
Please note that Database List and other pages will be unavailable.

Wednesday, January 8, 2025, 9:00 - 18:00 (JST)
The "UTokyo Repository" will be suspended for maintenance.

Saturday, December 21, 2024, 14:00 - Sunday, December 22, 2024, 3:00 (JST)
System maintenance will be performed on the EZproxy used for off-campus access. EZproxy will be unavailable for approximately 6 hours during this time. We apologise for any inconvenience.
Some databases can be accessed from off-campus using methods other than EZproxy. Please click here for details.
Please note that you will not be able to connect to the databases via VPN from off-campus.

Sunday, December 22, 2024, 16:00 - 18:00 (JST)
E-journal & E-book Portal and UTokyo Article Link will be suspended for maintenance. Access to content via UTokyo Article Link from database search results will also be unavailable.

Tuesday, December 17, 2024, 9:00 - 18:30 (JST)
The "UTokyo Repository" will be suspended for maintenance.

Saturday, November 30, 2024, 8:00 - 17:00 (JST)
The "JapanKnowledge Lib" will be suspended for maintenance.

Monday, November 25, 2024, 18:00 - 21:15 (JST)
Due to system maintenance, Asahi Shimbun Cross-Search services will be unavailable for about 30 minutes.
・Reduced-size Facsimile Edition “Keyword Search” Page flipping of result list (“Next 〇 results” display)
・Reduced-size Facsimile Edition “Regional Pages β version” Screen display of the image of the magazine
・Asahi Graph Screen display of the image of the magazine
*Services other than the above, such as article search, are available.

Tuesday, November 19, 2024, 9:00 - 12:00 (JST)
Due to system maintenance, UTokyo OPAC service (incl. MyOPAC and ASK) might be temporarily unstable.

Sunday, November 17, 2024, 16:00 - 18:00 (JST)
E-journal & E-book Portal and UTokyo Article Link will be suspended for maintenance. Access to content via UTokyo Article Link from database search results will also be unavailable.

Saturday, November 9, 2024, 8:00 - 17:00 (JST)
The "JapanKnowledge Lib" will be suspended for maintenance.

October 28, 2024 (Mon.) 9:30-10:00 (JST)
The entire University of Tokyo Library website (including the Literacy site and database list) will be unavailable.

October 25, 2024 (Fri.) 3:00-4:00 (JST)
The entire University of Tokyo Library website (including the Literacy site and database list) will be unavailable.

Sunday, October 20, 2024, 16:00 - 18:00 (JST)
E-journal & E-book Portal and UTokyo Article Link will be suspended for maintenance.
Access to content via UTokyo Article Link from database search results will also be unavailable.

Wednesday, 16, October, 2024, 19:00 - 23:00 (JST)
The "TREE" may be temporarily unavailable due to maintenance.

Sunday, September 22, 2024 9:00 - 17:00 (JST) *Start time has been changed from 13:00 to 9:00. (Changed on 9/19)
Online resources and services will be unavailable due to a planned power outage in Hongo Campus and UTNET maintenance as below. 
Services:
　 UTokyo OPAC (Including ASK and MyOPAC services)
　 UTokyo Digital Archive Portal (Image display only not available)
 　The University of Tokyo Doctorial Dissertation Database
 　Database of the Tibetan Tripitaka Card Catalog
 　Catalog of Classical Chinese Books in the General Library of the University of Tokyo
 　Kanze Archive

Sunday, September 22, 2024, 16:00-18:00 (JST)
E-journal & E-book Portal and UTokyo Article Link will be suspended for maintenance. Access to content via UTokyo Article Link from database search results will also be unavailable.

Thursday, September 19, 2024 22:30 - Saturday, September 21, 2024 6:00
The "Web of Science" will undergo scheduled maintenance. Access may be intermittent during this time.

Thursday, September 19, 2024, 10:00 - 12:00
All services of UTokyo Repository inluding searching and browsing will be unavailable.

The "UTokyo Repository" will be suspended from 18:00 Friday, September 13, 2024 to 10:00 Tuesday, September 17, 2024 (JST).

Monday, September 16, 2024, 7:00-10:00 (JST)
KinoDen" and "bREADER Cloud" will be inaccessible for maintenance.

August 21 (Wed.),2024 9:00-9:30 (JST)
August 22 (Thu.),2024 9:00-9:30 (JST)
Due to server maintenance, OPAC service (incl. MyOPAC and ASK services) will be stopped.
※Even if a connection is established during this time, it may stop accessing the site.

Saturday, August 17, 2024 20:00 - Sunday, August 18, 2024 0:00 (JST)
IEEE Xplore will undergo scheduled maintenance. During this time, there will be periods when the website will be unavailable.

Sunday, July 21, 2024, 16:00-18:00 (JST)
E-journal & E-book Portal and UTokyo Article Link will be suspended for maintenance. Access to content via UTokyo Article Link from database search results will also be unavailable.