Autonomous system
AS27321 ISC-F-AS
Unclassified ARIN
Summary
Internet Systems Consortium
business infrastructure dns vpn
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, andfuzzer.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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 3 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Fremont Cabal Internet Exchange | Fremont, United States | 206.80.238.60 |
| San Francisco Metropolitan Internet Exchange | San Francisco, United States | 206.197.187.56 |
| Amateur Radio Internet Exchange | Fremont, United States | 44.190.42.15 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-20, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 6 prefixes · 2.05K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 7 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS27318- Registry name
- ISC-F-AS
- Registrant
- Internet Systems Consortium, Inc.
- Abuse contact
- abuse@isc.org
- Registered
- 2003-02-12
- Last changed
- 2012-02-24
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 9 valid, 0 with no ROA
- ROAs
- 9 authorising AS27321
- ASPA
- no ASPA record
- IRR
- 100% registered · 9 of 9 announcements
- Route objects
- 12 naming AS27321
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,778 prefixes, as published 2026-10-20. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere