Autonomous system
AS6686 ATT-GCH-VOI-SF-AS VoIP platform - ex Concert
Unclassified RIPE
Summary
AT&T Global Network Services (VoIP platform, San Francisco)
enterprise legacy
ATT-GCH-VOI-SF-AS is one of a pair of small AT&T Global Network Services autonomous systems carrying a VoIP platform, this one anchored in San Francisco. The registrant is AT&T Global Network Services Nederland B.V., the Dutch entity through which AT&T holds much of this legacy RIPE space.
What it's used for
- A single
/24of infrastructure address space for a voice-over-IP platform — not customer or subscriber addressing. - Its sibling AS, AS6688, carries the equivalent Los Angeles platform on the adjacent
/24.
Notable
- The RIPE description records the platform as ex-Concert. Concert was the global joint venture between AT&T and BT, announced in 1998 and unwound in 2002; the network assets were divided between the two parents, and AT&T's share still shows up in registry data under handles like this one.
- This is a carrier platform AS, not an eyeball or transit network. Its address footprint is tiny by design — a service platform needs a handful of addresses, not a subscriber pool.
Interesting
- The pairing of two nearly identical ASNs (6686 / 6688) with two adjacent
/24s on two US coasts is a classic redundancy layout: the same service, deliberately split so that neither site is a single point of failure.
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 2026-10-27, 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
AS6686- Registry name
- ATT-GCH-VOI-SF-AS
- Registrant
- MAINT-AS2686
- Abuse contact
- peering@intl.att.com
- Registered
- 2003-09-24
- Last changed
- 2020-09-25
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 1 with no ROA
- ROAs
- 0 authorising AS6686
- ASPA
- no ASPA record
- IRR
- 100% registered · 1 of 1 announcements
- Route objects
- 2 naming AS6686
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: 447 networks and 1,852 prefixes, as published 2026-10-27. 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