Autonomous system
AS5609 ASN-CSELT Telecom Italia S.p.A.
Unclassified RIPE
Summary
CSELT / Telecom Italia
enterprise research legacy
ASN-CSELT is the autonomous system of CSELT — Centro Studi e Laboratori Telecomunicazioni, the Turin research centre of the Italian incumbent telco, later renamed Telecom Italia Lab. The registration today sits with Telecom Italia S.p.A., and the AS announces a single legacy block, 163.162.0.0/16.
What it's used for
Corporate and research address space inside the Telecom Italia group. One flat /16 (65,536 addresses) announced as a single prefix — the signature of an institutional network that was allocated its space in one piece and never needed to fragment it.
Notable
This is the incumbent's lab and corporate AS, not the eyeball network that serves Italian broadband subscribers. Addresses here should not be read as consumer access, despite the holder being the country's largest telco.
Interesting
The full AS name in the registry — "AS-CSELT CONVERTED TO ASN-CSELT FOR RPSL COMPLIANCE" — is a fossil of the mid-1990s migration to RPSL, when object names had to be reshaped to fit the new syntax and the old name was pasted into the field as a note. Nobody has cleaned it up in thirty years.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS3269 | Telecom Italia S.p.A. | 126 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-01, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 65.54K addresses IPv6 17 prefixes
| Country | Name | Prefixes |
|---|---|---|
| IT | Italy | 18 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS5609- Registry name
- ASN-CSELT
- Registrant
- INTERB-MNT
- Abuse contact
- abuse@business.telecomitalia.it
- Registered
- 1970-01-01
- Last changed
- 2025-05-22
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 3 valid, 0 with no ROA
- ROAs
- 3 authorising AS5609
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 2 naming AS5609
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: 449 networks and 1,846 prefixes, as published 2026-11-02. 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