AS27321 — ISC-F-AS

AS27321 announces 6 IPv4 prefixes covering 2,048 addresses and 1 IPv6 prefixes.

About this network

The AS handle ISC-F-AS is held by Internet Systems Consortium, Inc.

What it's used for

• The address space carries internal infrastructure for the Internet Systems Consortium, evidenced by reverse DNS entries such as vpn-client-64.isc.org, vpn-client-127.isc.org, and fuzzer.lab.isc.org.
• The network announces 2048 IPv4 addresses across 6 prefixes and 1 IPv6 prefix, with 8 observed neighbours, indicating a small-scale corporate or organizational network rather than a transit or access provider.

Notable

• All registrants for the announced prefixes are listed as Internet Systems Consortium, Inc., matching the AS holder.
• The address inventory consists of several /24 and /23 blocks within the 149.20.0.0/16 and 192.158.248.0/22 ranges, reflecting a segmented internal estate.

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

Announced prefixes

• 149.20.0.0/24
• 149.20.2.0/23
• 149.20.4.0/24
• 149.20.57.0/24
• 149.20.66.0/24
• 192.158.248.0/23
• 2001:500:6b::/48

Upstream networks

• AS6939 Hurricane Electric LLC
• AS6461 Zayo Bandwidth
• AS58057 Securebit AG

Adjacent networks

• AS6939 Hurricane Electric LLC
• AS6461 Zayo Bandwidth
• AS58057 Securebit AG

Internet exchanges

• Fremont Cabal Internet Exchange — Fremont, United States
• San Francisco Metropolitan Internet Exchange — San Francisco, United States
• Amateur Radio Internet Exchange — Fremont, United States