Autonomous system
AS39912 I3B-AS
Unclassified RIPE
Summary
oja.at
isp residential austria nsp
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.atand254-101-220-077.ascus.at, alongside generic AS-based PTRs like255-087-143-095.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 Hostmasterandoja.at GmbHfor prefixes including78.142.96.0/20and93.185.128.0/20. - 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 9 exchanges in 4 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.192.116 |
| KleyReX Internet Exchange | Frankfurt, Germany | 193.189.82.116 |
| DE-CIX New York | New York, United States | 2001:504:36::9be8:0:1 |
| DE-CIX Dusseldorf | Düsseldorf, Germany | 185.1.170.20 |
| DE-CIX Munich | Munich, Germany | 185.1.208.28 |
| DE-CIX Hamburg | Hamburg, Germany | 185.1.210.29 |
| Vienna Internet Exchange | Vienna, Austria | 193.203.0.134 |
| DE-CIX Istanbul | Istanbul, Turkey | 185.1.48.24 |
Transit providers
12 upstream, 11 downstream and 34 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 46 prefixes · 49.92K addresses IPv6 3 prefixes
| Country | Name | Prefixes |
|---|---|---|
| AT | Austria | 49 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS39912- Registry name
- i3B-AS
- Registrant
- i3B-MNT
- Abuse contact
- abuse@oja.at
- Registered
- 2006-05-16
- Last changed
- 2026-08-03
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 98% valid · 45 valid, 1 with no ROA
- ROAs
- 54 authorising AS39912
- ASPA
- no ASPA record
- IRR
- 100% registered · 46 of 46 announcements
- Route objects
- 51 naming AS39912
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