ASN Lookup Tool
AS2501 U-TOKYO

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS2501
Organisation
The University of Tokyo Autonomous System
Name
U-TOKYO
Total IPv4 Addresses
200704
Total IPv4 Prefixes
4
Total IPv6 Prefixes
17
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#1,122 out of 76,964
Registry
Radb
Registered Country
JP flag JP
Registered Country Name
Japan
Registered Date
NA
Registration Last Change
NA
Receiving From

The list of active Autonomous Systems (ASs) which send traffic to that ASN.

ASN
Organisation
JP flagfor assignment to JPNIC members
JP flagWIDE Project in Japan
IPv4 Active Prefixes

This provides the list of IPv4 address space routes/prefixes currently announced on Border Gateway Protocol (BGP).

Autonomous System (AS) is a network (or collection of networks) that are all managed and supervised by a single entity or organisation. This tool provides a comprehensive ownership and connectivity report for any given AS number.