Autonomous system
AS12081 GREENHECK - Greenheck Fan
Unclassified ARIN
Summary
Greenheck Fan
enterprise legacy
A Wisconsin ventilation manufacturer holding a block from the earliest class C space.
What it's used for
- Corporate connectivity. 256 addresses in one
/24with two observed BGP neighbours and no IPv6 announced.
Notable
- The single prefix is
192.5.46.0/24, netnameGREENHECK24, registered to Greenheck Fan directly. - Two neighbours, so there is a second path for a network of 256 addresses.
- It first appears in routing data in 2002, well after the block itself was assigned.
Interesting
192.5.0.0is about as early as commercially assigned address space gets. The192.0.0.0/8range was the first tranche of class C networks handed out, and the low second octet puts this block near the front of that queue — issued in the era when a/24was called a class C, came from a paper request, and there were still plenty left.- Greenheck makes fans, dampers and ventilation hoods for large buildings. It is the kind of manufacturer that quietly holds a piece of internet history because it computerised early and never gave the addresses back. Blocks like this are now worth real money on the transfer market, which is the main reason anyone thinks about them at all.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-03, 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 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS12081- Registry name
- GREENHECK
- Registrant
- Greenheck Fan
- Abuse contact
- eric.pond@greenheck.com
- Registered
- 1999-03-17
- Last changed
- 2012-02-24
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 1 with no ROA
- ROAs
- 0 authorising AS12081
- ASPA
- no ASPA record
- IRR
- 100% registered · 1 of 1 announcements
- Route objects
- 1 naming AS12081
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: 448 networks and 1,851 prefixes, as published 2026-11-04. 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