Autonomous system
AS33071 ISC-F-AS
Unclassified ARIN
Summary
Internet Systems Consortium
business infrastructure non-profit dns
The AS handle ISC-F-AS is held by Internet Systems Consortium, Inc.
What it's used for
- The space carries infrastructure for the Internet Systems Consortium, evidenced by the netname
ISC-NET6and the reverse DNS entryguest.ord1.isc.org. - The AS announces 256 IPv4 addresses and 1 IPv6 prefix, with 11 observed neighbours, indicating a small-scale internal corporate estate rather than a transit or access network.
Notable
- The registrant for the announced prefix 199.6.0.0/24 is Internet Systems Consortium, Inc., which matches the AS holder.
- The address inventory consists of a single /24 block and a single /48 IPv6 prefix, representing a compact and finely subdivided internal network.
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 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Equinix Internet Exchange Chicago | Chicago, United States | 208.115.136.2 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-17, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 256 addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 2 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS33071- Registry name
- ISC-F-AS
- Registrant
- Internet Systems Consortium, Inc.
- Abuse contact
- abuse@isc.org
- Registered
- 2004-09-28
- Last changed
- 2012-02-24
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 2 valid, 0 with no ROA
- ROAs
- 2 authorising AS33071
- ASPA
- no ASPA record
- IRR
- 50% registered · 1 of 2 announcements
- Route objects
- 1 naming AS33071
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 1,783 prefixes, as published 2026-10-17. 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