AS12081 — GREENHECK

AS12081 announces 1 IPv4 prefixes covering 256 addresses and 0 IPv6 prefixes.

About this network

A Wisconsin ventilation manufacturer holding a block from the earliest class C space.

What it's used for

• Corporate connectivity. 256 addresses in one /24 with two observed BGP neighbours and no IPv6 announced.

Notable

• The single prefix is 192.5.46.0/24, netname GREENHECK24, 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

• 192.5.0.0 is about as early as commercially assigned address space gets. The 192.0.0.0/8 range 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 /24 was 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.

Announced prefixes

• 192.5.46.0/24

Upstream networks

• AS3663 NetNet
• AS5650 Frontier Communications of America, Inc.

Adjacent networks

• AS3663 NetNet
• AS5650 Frontier Communications of America, Inc.