asn.dev

Autonomous system

AS15733 ZUMTOBEL-AS Corporate Datacenter Austria

Unclassified RIPE

IPv4 addresses 65.54K 1 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly AT
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Zumtobel Group

Austria · AI-generated

enterprise business hosting

Every sampled address answers with the same name, and the name is the word undefined.

What it's used for

  • A lighting manufacturer's corporate network. One IPv4 /16 and one IPv6 prefix announced from Austria, sixty-five thousand addresses, through a single observed BGP neighbour.

Notable

  • All three sampled addresses answer, and all three return undefined.zgrp.net, character for character the same.
  • That domain is a four-letter contraction of the group name rather than the company's public one.
  • The whole IPv4 holding is one /16, announced complete, with no smaller pieces.
  • The AS handle continues past the abbreviation into a description naming a corporate data centre and the country.
  • The single block's netname is the bare brand, and its only registrant is a hostmaster object. No company record and no abuse role are listed.
  • Sixty-five thousand addresses depend on one upstream.

Interesting

  • A reverse zone answering undefined for everything is a wildcard with a placeholder value. It was set so that every address returns something, and the something it returns is the word a program prints when it has no value to print.
  • It is also useful in a way nobody intended. Three addresses spread across a /16 all answering identically says the zone is generated at the top and nothing below it is described.
  • A manufacturer with a whole /16 and one upstream is an allocation from an era of plenty, routed as simply as it was in the year it arrived.

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

Full topology · Graph

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.

ASNetworkPaths seen
AS8447A1 Telekom Austria AG98

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 1 prefixes · 65.54K addresses IPv6 1 prefixes

CountryNamePrefixes
ATAustria2

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS15733
Registry name
ZUMTOBEL-AS
Registrant
Zumtobel Group AG
Abuse contact
cca-zg-ripe@cancom.com
Registered
2002-07-14
Last changed
2025-10-24
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
0 authorising AS15733
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS15733

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: 442 networks and 1,773 prefixes, as published 2026-10-13. 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

Cross-check