AS39912 — I3B-AS

AS39912 announces 46 IPv4 prefixes covering 49,920 addresses and 3 IPv6 prefixes.

About this network

I3B-AS is operated by oja.at GmbH, an Austrian internet service provider based in Klagenfurt.

What it's used for

• The address space carries residential and business internet access, evidenced by reverse DNS entries such as 255-099-220-077.oja.at and 254-101-220-077.ascus.at, alongside generic AS-based PTRs like 255-087-143-095.as39912.net.
• With 49,920 IPv4 addresses announced across 46 prefixes and 107 observed neighbours, the network functions as a regional access provider with significant peering and transit relationships.
• Traffic from this AS consists primarily of subscriber eyeballs and small business endpoints, consistent with oja.at's role as a local ISP providing data processing and internet services.

Notable

• All registrants in the sample align with the announcer, listing Oja.at Hostmaster and oja.at GmbH for prefixes including 78.142.96.0/20 and 93.185.128.0/20.
• The address inventory is finely subdivided into numerous /21 and /22 blocks, reflecting a segmented estate for different customer segments or geographic areas within Austria.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 37.186.0.0/22
• 37.186.4.0/24
• 37.186.6.0/23
• 37.186.8.0/21
• 37.186.16.0/21
• 77.220.96.0/21
• 77.220.104.0/22
• 77.220.108.0/24
• 77.220.110.0/23
• 77.220.112.0/22
• 77.220.120.0/21
• 78.142.64.0/23
• 78.142.68.0/22
• 78.142.72.0/21
• 78.142.96.0/20
• 78.142.112.0/22
• 78.142.116.0/23
• 78.142.122.0/23
• 78.142.124.0/22
• 81.94.48.0/22
• 81.94.52.0/23
• 81.94.54.0/24
• 81.94.56.0/21
• 91.206.224.0/23
• 92.42.16.0/22
• 92.63.208.0/22
• 92.63.212.0/24
• 92.63.214.0/23
• 92.63.216.0/21
• 93.185.128.0/20
• 95.143.80.0/20
• 193.47.156.0/24
• 194.34.226.0/24
• 195.16.224.0/21
• 195.16.232.0/22
• 195.16.236.0/23
• 195.16.238.0/24
• 195.16.241.0/24
• 195.16.242.0/23
• 195.16.245.0/24
• 195.16.246.0/23
• 195.16.251.0/24
• 195.16.253.0/24
• 195.16.254.0/23
• 195.140.136.0/22
• 213.139.252.0/22
• 2a00:e98::/32
• 2a01:f8::/32
• 2a01:100::/32

Upstream networks

• AS8540 AMA netwoRX GmbH
• AS34549 meerfarbig GmbH & Co. KG
• AS6939 Hurricane Electric LLC
• AS24482 SG.GS
• AS212024 Marc Schmitt
• AS34019 Hivane Association
• AS20485 Joint Stock Company TransTeleCom
• AS3303 Swisscom (Schweiz) AG
• AS37100 SEACOM Limited
• AS33891 Core-Backbone GmbH
• AS29632 Netassist International EOOD
• AS213241 TECHIT.BE SRL

Downstream networks

• AS59456 HMB Holding GmbH
• AS61201 Hohere technische Bundeslehranstalt Klagenfurt
• AS51413 Wirtschaftskammer Kaernten
• AS61438 ip-it consult GmbH
• AS61155 CUBiT IT Solutions GmbH
• AS207131 Stadtgemeinde Leoben
• AS50255 LITECOM AG
• AS62373 futurenet.gmbH
• AS44752 oja.at GmbH
• AS62155 oja.at GmbH
• AS41905 oja.at GmbH

Adjacent networks

• AS8540 AMA netwoRX GmbH
• AS6939 Hurricane Electric LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS59456 HMB Holding GmbH
• AS51413 Wirtschaftskammer Kaernten
• AS61201 Hohere technische Bundeslehranstalt Klagenfurt
• AS61438 ip-it consult GmbH
• AS61155 CUBiT IT Solutions GmbH
• AS212024 Marc Schmitt
• AS207131 Stadtgemeinde Leoben
• AS24482 SG.GS
• AS3303 Swisscom (Schweiz) AG
• AS37100 SEACOM Limited
• AS20485 Joint Stock Company TransTeleCom
• AS34019 Hivane Association
• AS50255 LITECOM AG
• AS33891 Core-Backbone GmbH
• AS44752 oja.at GmbH
• AS62373 futurenet.gmbH
• AS62155 oja.at GmbH
• AS29632 Netassist International EOOD
• AS17639 Converge ICT Solutions Inc.
• AS213241 TECHIT.BE SRL
• AS41905 oja.at GmbH
• AS3223 Voxility LLP

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• KleyReX Internet Exchange — Frankfurt, Germany
• DE-CIX New York — New York, United States
• DE-CIX Dusseldorf — Düsseldorf, Germany
• DE-CIX Munich — Munich, Germany
• DE-CIX Hamburg — Hamburg, Germany
• Vienna Internet Exchange — Vienna, Austria
• DE-CIX Istanbul — Istanbul, Turkey
• Alpes Adria Internet Exchange — Klagenfurt, Austria