Autonomous system
AS6373 OPUS1
Unclassified ARIN NSP
Summary
Opus One
enterprise legacy
OPUS1 is Opus One, a network and information-security consulting firm in Tucson, Arizona, founded and run by long-time industry figure Joel Snyder. It has held this AS number since 1996.
What it's used for
- The firm's own corporate network and public services (
opus1.com/opus1.net). - A product-testing lab: Opus One is known for hands-on evaluations of security, email and networking products, and much of its address space fronts test benches and lab gear rather than production services.
- A small amount of colocated infrastructure.
Notable
This is enterprise address space belonging to a consultancy, not an ISP — an unusually large allocation for a small firm, which is the signature of an early registrant. Reverse DNS is telling: hostnames like not-in-use, visitor-wlan and colo-gw-public describe a lab and office network, not subscribers.
The low AS number and the pre-ARIN-era address blocks reflect a 1990s allocation, when a technically active small company could readily obtain both.
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 |
|---|---|---|
| Fremont Cabal Internet Exchange | Fremont, United States | 206.80.238.44 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-26, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 9.98K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 8 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS6373- Registry name
- OPUS1
- Registrant
- Opus One
- Abuse contact
- abuse@opus1.com
- Registered
- 1996-03-25
- Last changed
- 1996-03-25
- Allocation
- assigned
Declared
PeeringDB profile
- Name
- Opus One
- Also known as
- Opus One, Inc.
- Network type
- NSP
- Scope
- Regional
- Traffic ratio
- Balanced
- Peering policy
- Open
- IRR as-set
AS6373:AS-ALL- Present at
- 1 exchanges
- Facilities
- 1 facilities
- Website
- http://www.opus1.com/
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 11% valid · 1 valid, 8 with no ROA
- ROAs
- 1 authorising AS6373
- ASPA
- no ASPA record
- IRR
- 100% registered · 9 of 9 announcements
- Route objects
- 15 naming AS6373
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: 445 networks and 1,817 prefixes, as published 2026-10-27. 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