AS4

Summary

Country	United States
Organization	University of Southern California
Domain	isi.edu
Number of IPv4	68,864
Number of IPv6	7.9235× 1028
AS Type	Education
Registry	ARIN
Allocated	February 22, 1984 (about 42 years ago)
Updated	September 29, 2023 (about 2 years ago)

IP Ranges

AS4 announces 40 IPv4 ranges and 7 IPv6 ranges.

That's a total of 68,864 IPv4 addresses and 7.9235× 10²⁸ IPv6 addresses.

Prefix	Organization	Size	Registry	Status
128.9.0.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.16.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.17.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.18.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.19.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.26.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.28.0/23	University of Southern California	512	ARIN	ALLOCATION
128.9.30.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.31.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.32.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.34.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.35.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.36.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.37.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.38.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.40.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.43.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.44.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.46.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.47.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.48.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.64.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.80.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.96.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.112.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.113.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.117.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.122.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.123.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.127.0/24	University of Southern California	256	ARIN	ALLOCATION
128.9.128.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.144.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.160.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.176.0/20	University of Southern California	4,096	ARIN	ALLOCATION
128.9.192.0/18	University of Southern California	16,384	ARIN	ALLOCATION
198.32.16.0/24	Cyrusone LLC	256	ARIN	ALLOCATION
206.117.6.0/24	Los Nettos	256	ARIN	ALLOCATION
206.117.27.0/24	Los Nettos	256	ARIN	ALLOCATION
206.117.31.0/24	Los Nettos	256	ARIN	ALLOCATION
206.117.37.0/24	Los Nettos	256	ARIN	ALLOCATION

Prefix	Organization	Size	Registry	Status
2001:500:202::/48	B.Root-Server-OPS	1.2089× 1024	ARIN	ALLOCATION
2001:1878:401::/48	Los Nettos	1.2089× 1024	ARIN	ALLOCATION
2001:1878:402::/48	Los Nettos	1.2089× 1024	ARIN	ALLOCATION
2001:1878:403::/48	Los Nettos	1.2089× 1024	ARIN	ALLOCATION
2001:1878:404::/48	Los Nettos	1.2089× 1024	ARIN	ALLOCATION
2606:d5c0::/48	University of Southern California	1.2089× 1024	ARIN	ALLOCATION
2606:d5c0::/32	University of Southern California	7.9228× 1028	ARIN	ALLOCATION

Peers

AS4 actively fosters the following peering relationships that enhance network performance through direct, settlement-free traffic exchange. Even with a modest number of peers, each connection serves as a strategic asset—optimizing routing, reducing latency, and minimizing transit costs.

Upstreams

AS4 connects to the global Internet via at least 10 upstream providers. In this setup, AS4 acts as a customer, subscribing to these transit services to obtain full BGP routing information and ensure reliable, redundant access to external networks.

Downstreams

AS4 serves as a transit provider the following ASes, delivering the BGP routes needed for global connectivity. This downstream relationship underscores AS4's role in extending Internet access beyond its own infrastructure.