The University of Tokyo operates AS2501: 4 IPv4 prefixes covering 200,704 addresses, most of them in 
Japan.
By IPv4 addresses the network ranks #1,063 worldwide and #47 of 848 networks in Japan. That is 0.10% of the country’s IPv4 space.
The largest block is 157.82.0.0 to 157.82.255.255 with 65,536 addresses, geolocated to Chiyoda.
- IPv4 addresses
- 200,704
- IPv4 prefixes
- 4
- World rank
- #1,063
- Country share
- 0.10%
- IPv6 ranges
- 1
Addresses by country
- Japan 100%
Largest blocks
- 157.82.0.0 Chiyoda65,536
- 133.11.0.0 Chiyoda City65,536
- 130.69.0.0 Chiyoda65,536
- 192.51.208.0 Chiyoda City4,096
Networks of similar size
- AS35228 Telefonica UK Limited
201,728 - AS7687 TOYOTA SYSTEMS CORPORATION200,960
- AS45458 ADVANCED WIRELESS NETWORK COMPANY LIMITED
200,704 - AS34878 Karlsruhe Institute of Technology
200,704 - AS9354 Community Network Center Inc.200,448
- AS38565 Ncell Pty. Ltd.
200,448 - AS4686 BEKKOAME INTERNET INC.200,448
- AS21050 Fast Communication Company Ltd
200,448
IPv4 prefixes
Questions and answers
Who owns AS2501?
Autonomous system AS2501 is operated by The University of Tokyo.
How many IP addresses does AS2501 have?
The network holds 200,704 IPv4 addresses in 4 prefixes, plus 1 IPv6 ranges.
Which country is AS2501 in?
The main country is Japan.
How big is AS2501?
By IPv4 addresses it ranks #1,063 worldwide.
What is the largest address block of AS2501?
157.82.0.0 to 157.82.255.255, 65,536 addresses.