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ASN Lookup Tool
AS4 ISI-AS

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS4
Organisation
University of Southern California
Name
ISI-AS
Total IPv4 Addresses
65,280
Total IPv4 Prefixes
51
Total IPv6 Prefixes
19
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#3,627 out of 77,536
Registry
Arin
Registered Country
US flag US
Registered Country Name
United States of America (the)
Registered Date
1984-02-22
Registration Last Change
2023-09-29
Receiving From

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

ASN
Organisation
AS174
US flagCogent Communications
AS226
US flagLos Nettos
AS35575
GB flagVaioni Group Ltd
AS51043
GB flagAspire Technology Solutions Ltd
AS10886
US flagUniversity of Maryland
Showing 5 of 8
IPv4 Active Prefixes

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

Prefix128.9.0.0/20
Range From128.9.0.0
Range To128.9.15.255
Prefix128.9.16.0/24
Range From128.9.16.0
Range To128.9.16.255
Prefix128.9.17.0/24
Range From128.9.17.0
Range To128.9.17.255
Prefix128.9.18.0/24
Range From128.9.18.0
Range To128.9.18.255
Prefix128.9.20.0/24
Range From128.9.20.0
Range To128.9.20.255
Showing 5 of 51
IPv6 Active Prefixes
Prefix2001:500:202::/48
Range From2001:500:202::
Range To2001:500:202:ffff:ffff:ffff:ffff:ffff
Prefix2001:1878:401::/48
Range From2001:1878:401::
Range To2001:1878:401:ffff:ffff:ffff:ffff:ffff
Prefix2001:1878:402::/48
Range From2001:1878:402::
Range To2001:1878:402:ffff:ffff:ffff:ffff:ffff
Prefix2001:1878:403::/48
Range From2001:1878:403::
Range To2001:1878:403:ffff:ffff:ffff:ffff:ffff
Prefix2001:1878:404::/48
Range From2001:1878:404::
Range To2001:1878:404:ffff:ffff:ffff:ffff:ffff
Showing 5 of 19
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.