Autonomous system
AS5623 ATT-CH-0A AT&T Global Network Services Nederland B.V.
Unclassified RIPE
Summary
AT&T Global Network Services Nederland
enterprise transit legacy
ATT-CH-0A is one of AT&T's EMEA autonomous systems, registered to AT&T Global Network Services Nederland B.V. in The Hague. The RIPE description reads "ATT-EMEA Autonomous System (dr6348)" — an internal routing-domain reference rather than a customer-facing name.
What it's used for
Enterprise network services in Europe. AT&T Global Network Services delivers managed connectivity, MPLS/VPN and internet access to multinational corporate customers; this AS is a small piece of that estate, announcing a single /24.
Notable
At 256 addresses this is an operational fragment of a global carrier, not a backbone. Treat it as corporate/managed-service space: what sits behind it is business infrastructure, and its size tells you nothing about AT&T's actual footprint, which is spread across many separate autonomous systems.
Interesting
The dr6348 tag in the description is the kind of internal identifier that occasionally escapes into public registry data. It is a small demonstration of why AS descriptions are a starting point for identification, never the whole answer — the useful information here is the org record, not the name.
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 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS2686 | AT&T Enterprises, LLC | 60 |
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 1 prefixes · 256 addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| NL | Netherlands | 1 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS5623- Registry name
- ATT-CH-0A
- Registrant
- MAINT-AS2686
- Abuse contact
- peering@intl.att.com
- Registered
- 2002-02-13
- Last changed
- 2018-09-21
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 1 with no ROA
- ROAs
- 0 authorising AS5623
- ASPA
- no ASPA record
- IRR
- 100% registered · 1 of 1 announcements
- Route objects
- 2 naming AS5623
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