Autonomous system
AS5606 GTS-BACKBONE GTS Telecom SRL
Unclassified RIPE
Summary
GTS Telecom (Romania)
transit isp legacy
GTS-BACKBONE is the backbone AS of GTS Telecom SRL, the Romanian operator of the former GTS Central Europe group, headquartered on Strada Izvor in Bucharest. Deutsche Telekom acquired GTS Central Europe in 2014, and GTS Telecom has been part of the Deutsche Telekom group since.
What it's used for
Business-grade connectivity in Romania: IP transit, fibre and cross-border capacity, VPN services and data-centre hosting, delivered over GTS's own network and direct interconnects with tier-1 carriers. Roughly 92,000 IPv4 addresses.
Notable
This is a corporate carrier rather than a consumer ISP — the customer base is companies and institutions, so addresses here generally front business sites and hosted infrastructure. The RIPE object still publishes a 24x7 NOC contact, a small tell of a network run for enterprise SLAs.
Interesting
The Czech side of the same group kept its own registration and number — see AS5588. Two ASNs, one corporate history, and neither one inherits the other's shape: the Romanian AS is the local backbone, not a branch of the Czech one.
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 3 exchanges in 3 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.195.46 |
| AMS-IX Amsterdam | Amsterdam, Netherlands | 80.249.214.164 |
| Vienna Internet Exchange | Vienna, Austria | 193.203.0.244 |
Transit providers
34 upstream, 80 downstream and 148 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 2026-11-04, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 114 prefixes · 91.90K addresses IPv6 17 prefixes
| Country | Name | Prefixes |
|---|---|---|
| RO | Romania | 131 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS5606- Registry name
- GTS-BACKBONE
- Registrant
- AS5606-MNT
- Abuse contact
- abuse@gtstelecom.ro
- Registered
- 2002-06-20
- Last changed
- 2022-05-04
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 78% valid · 108 valid, 30 with no ROA
- ROAs
- 104 authorising AS5606
- ASPA
- no ASPA record
- IRR
- 99.3% registered · 137 of 138 announcements
- Route objects
- 180 naming AS5606
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: 453 networks and 1,853 prefixes, as published 2026-11-05. 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