AS4

Summary

Country	United States
Organization	University of Southern California
Domain	isi.edu
Number of IPv4	69,120
Number of IPv6	7.9235× 1028
AS Type	Education
Registry	ARIN
Allocated	February 22, 1984 (about 41 years ago)
Updated	September 29, 2023 (about 1 year ago)

IP Ranges

AS4 announces 41 IPv4 ranges and 7 IPv6 ranges.

That's a total of 69,120 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
128.9.20.0/24	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 8 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 currently has no downstream networks, meaning it does not serve as a transit provider to customer networks.