Autonomous system
AS29990 ASN-APPNEX
Hosting ARIN
Summary
Xandr
adtech business exchange
ASN-APPNEXUS is operated by Xandr Inc., the digital advertising exchange formerly known as AppNexus.
What it's used for
- The address space carries internal corporate infrastructure for ad exchange operations, evidenced by reverse DNS entries like
bm-impbus.prod.fra1.adnexus.netandintdnsrecurse01.sin3.appnexus.net. - With 33,792 IPv4 addresses announced across 36 prefixes and 19 observed neighbours, the ratio indicates a large-scale internal corporate estate rather than a transit or access network.
Notable
- Registrants consistently identify the holder as Xandr Inc. or its regional subsidiaries, such as AppNexus Singapore Pte. Ltd. and AppNexus Australia Pty Limited, aligning with the AS holder.
- AppNexus was rebranded to Xandr in 2021 following its acquisition by AT&T, which later divested the unit to a private equity consortium.
- The inventory includes a mix of US-based blocks and international segments, with netnames like
LVLT-APPNEXUS-APPNE-64-210-56reflecting historical Level 3 allocations.
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 7 exchanges in 4 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.193.53 |
| AMS-IX Amsterdam | Amsterdam, Netherlands | 80.249.209.220 |
| Equinix Internet Exchange Singapore | Singapore, Singapore | 27.111.228.179 |
| Coresite - Any2 West | Los Angeles, United States | 206.72.210.208 |
| Any2 California | Los Angeles, United States | 206.72.210.208 |
| DE-CIX New York | New York, United States | 206.82.104.119 |
| Equinix Internet Exchange New York | New York, United States | 198.32.118.200 |
Transit providers
9 upstream, 0 downstream and 15 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 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 36 prefixes · 33.79K addresses IPv6 8 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 44 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS29990- Registry name
- ASN-APPNEXUS
- Registrant
- Xandr Inc.
- Abuse contact
- xdr-abuse@microsoft.com
- Registered
- 2008-01-10
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 49 with no ROA
- ROAs
- 0 authorising AS29990
- ASPA
- no ASPA record
- IRR
- 100% registered · 49 of 49 announcements
- Route objects
- 74 naming AS29990
Reputation
Classification and threat
Hosting Datacenter or cloud provider. Addresses are servers, not people.
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: 442 networks and 1,782 prefixes, as published 2026-10-16. 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