AS27321

Summary

Country	United States
Organization	Internet Systems Consortium, Inc.
Domain	isc.org
Number of IPv4	1,792
Number of IPv6	1.2089× 1024
AS Type	ISP
Registry	ARIN
Allocated	February 12, 2003 (about 23 years ago)
Updated	February 24, 2012 (about 13 years ago)

IP Ranges

AS27321 announces 7 IPv4 ranges and 1 IPv6 range.

That's a total of 1,792 IPv4 addresses and 1.2089× 10²⁴ IPv6 addresses.

Prefix	Organization	Size	Registry	Status
149.20.2.0/24	Internet Systems Consortium, Inc.	256	ARIN	ALLOCATION
149.20.3.0/24	Internet Systems Consortium, Inc.	256	ARIN	ALLOCATION
149.20.4.0/24	Internet Systems Consortium, Inc.	256	ARIN	ALLOCATION
149.20.57.0/24	Internet Systems Consortium, Inc.	256	ARIN	ALLOCATION
149.20.66.0/24	Internet Systems Consortium, Inc.	256	ARIN	ALLOCATION
192.158.248.0/24	Internet Systems Consortium, Inc.	256	ARIN	ALLOCATION
192.158.249.0/24	Internet Systems Consortium, Inc.	256	ARIN	ALLOCATION

Prefix	Organization	Size	Registry	Status
2001:500:6b::/48	Internet Systems Consortium, Inc.	1.2089× 1024	ARIN	ALLOCATION

Peers

AS27321 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

AS27321 connects to the global Internet via at least 2 upstream providers. In this setup, AS27321 acts as a customer, subscribing to these transit services to obtain full BGP routing information and ensure reliable, redundant access to external networks.

Downstreams

AS27321 serves as a transit provider the following ASes, delivering the BGP routes needed for global connectivity. This downstream relationship underscores AS27321's role in extending Internet access beyond its own infrastructure.