Autonomous system
AS8387 T-SYSTEMS-AT Rennweg 97-99
Unclassified RIPE NSP
Summary
Deutsche Telekom Global Business Solutions (Austria)
enterprise legacy
T-SYSTEMS-AT is the Austrian network of Deutsche Telekom's corporate IT arm, registered today as Deutsche Telekom Global Business Solutions GmbH and long known as T-Systems Austria. The registry name is one of those that reads as a street address, Rennweg 97-99, which is simply the Vienna office.
What it's used for
- Managed ICT services for corporate and public-sector customers in Austria: hosting, managed WAN and remote-access services, and the systems T-Systems runs on their behalf. Reverse DNS across the space is full of
t-systems.atservice names, including management and dial-in infrastructure. - Service infrastructure for the Deutsche Telekom group in Austria. Parts of the space resolve to
t-mobile.atand to thes-budget-mobile.atMVNO, so the AS also carries operator-side systems rather than only customer workloads.
Notable
- This is a B2B and internal-services network, not an eyeball one. Magenta's Austrian consumer broadband and mobile subscribers live on other ASNs; the kind here follows what the AS actually carries, not the Telekom brand on the door.
- About 90,000 IPv4 addresses across a small number of prefixes, including a full legacy
164.3.0.0/16, which is a sign of an old allocation to the T-Systems predecessor rather than a modern assignment.
Interesting
- The handle preserves a company that no longer exists under that name. Deutsche Telekom retired the T-Systems brand for much of this business and rebranded it Global Business Solutions, but the AS handle and the reverse DNS both still say T-Systems, which is the usual way corporate renamings show up in routing data.
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 |
|---|---|---|
| Vienna Internet Exchange | Vienna, Austria | 193.203.0.12 |
Transit providers
9 upstream, 6 downstream and 20 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 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 23 prefixes · 91.65K addresses IPv6 4 prefixes
| Country | Name | Prefixes |
|---|---|---|
| AT | Austria | 27 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS8387- Registry name
- T-SYSTEMS-AT
- Registrant
- AS8387-MNT
- Abuse contact
- AT_NOC@telekom.com
- Registered
- 2002-04-25
- Last changed
- 2023-10-05
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- Deutsche Telekom Global Business Solutions GmbH
- Network type
- NSP
- Scope
- Not Disclosed
- Traffic ratio
- Balanced
- Peering policy
- Open
- IRR as-set
RIPE::AS8387:AS-T-SYSTEMS-AT RIPE::AS8387:AS-T-SYSTEMS-AT-V6- Present at
- 1 exchanges
- Website
- https://www.t-systems.at
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
- 86% valid · 18 valid, 3 with no ROA
- ROAs
- 18 authorising AS8387
- ASPA
- no ASPA record
- IRR
- 100% registered · 21 of 21 announcements
- Route objects
- 111 naming AS8387
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: 436 networks and 1,771 prefixes, as published 2026-10-13. 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