AS4 — ISI-AS - University of Southern California

AS4 announces 13 IPv4 prefixes covering 65,536 addresses and 6 IPv6 prefixes.

About this network

One of the oldest allocations on the internet (ISI-AS), belonging to the Information Sciences Institute of the University of Southern California.

What it's used for

• Research networking for ISI, a computer science and networking research institute.

Notable

• A single-digit AS number reflects how early ISI connected. ISI was central to the early internet: home of Jon Postel and the original IANA functions.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 128.9.0.0/20
• 128.9.16.0/22
• 128.9.26.0/24
• 128.9.28.0/22
• 128.9.32.0/19
• 128.9.64.0/18
• 128.9.128.0/17
• 170.79.218.0/23
• 198.32.16.0/24
• 206.117.6.0/24
• 206.117.27.0/24
• 206.117.31.0/24
• 206.117.37.0/24
• 2001:500:202::/48
• 2001:1878:401::/48
• 2001:1878:402::/47
• 2001:1878:404::/48
• 2606:d5c0::/32
• 2804:3edc::/32

Upstream networks

• AS226 Los Nettos
• AS567 Los Nettos
• AS10886 University of Maryland
• AS174 Cogent Communications, LLC
• AS266625 WCA TELECOM
• AS400215 Sambanova Systems, Inc.
• AS266306 CENTRALNETT SERVICOS LTDA
• AS37358 BitCo

Downstream networks

• AS139451 PT SARANA INTI MAKMUR BERSAMA
• AS328434 Netovate (PTY) LTD
• AS2635 Automattic, Inc

Adjacent networks

• AS226 Los Nettos
• AS567 Los Nettos
• AS10886 University of Maryland
• AS174 Cogent Communications, LLC
• AS266625 WCA TELECOM
• AS400215 Sambanova Systems, Inc.
• AS266306 CENTRALNETT SERVICOS LTDA
• AS37358 BitCo
• AS58821 PT Lintas Jaringan Nusantara
• AS328434 Netovate (PTY) LTD
• AS139451 PT SARANA INTI MAKMUR BERSAMA
• AS30844 Liquid Telecommunications Ltd
• AS2635 Automattic, Inc

Routing security

• RPKI: 1 valid, 0 invalid and 52 not-found announcements; 4 ROAs.
• ASPA: none published.
• IRR: 34% of announcements registered; 28 route objects.
• Listed in as-sets: AS-13097, AS-CALREN2, AS-CTBC-CUSTOMERS181, AS-CTBC-CUSTOMERS66, AS-EUNIC-IX, AS-HURRICANEV6, AS-LOSNETTOS, AS-LOSNETTOS-IPV6, AS-PNAPACS, AS-ST1-CUSTOMERS, AS-XO-B, AS10886:AS-4-ALL, AS10886:AS-ALL, AS174:AS-COGC-030, AS293:AS-FROM-SINGAREN-TO-ESNET.