Autonomous system
AS13043 BAYER-AS
Unclassified RIPE
Summary
Bayer
enterprise business infrastructure
A pharmaceutical company's network where half the blocks still carry an acquired firm's name.
What it's used for
- The corporate network of a German pharmaceutical and chemical company. 177,152 addresses across 42 IPv4 prefixes, three observed BGP neighbours, and no IPv6 announced.
Notable
- Netnames split between the holder's own (
Bayer,Bayer-LEV) and another company's (SCHERING1,SCHERING2,SCHERING-A). - Every block lists the same registry contacts:
Bayer Admin Contact PersonsandBayer Tech Contact Persons. - Eighteen addresses were sampled and none returned a name.
- Three observed BGP neighbours for 42 prefixes.
Interesting
- The acquired company's name on the largest blocks is the most durable trace of a merger anywhere in these records. Registrant fields were updated to the new owner; the netnames were not, because nothing breaks if they stay wrong. The registry ends up as a slow archive of corporate history.
- The contact objects are named in the plural, as groups of persons rather than a role or a mailbox. Most holders register a single abuse role; naming a set of people is a older convention that predates the shared-mailbox habit.
- Two netnames use mixed case where nearly every record in this range is uppercase throughout.
- Forty-two prefixes and no reverse names at all. A private corporate network announces its space so it is reachable from its own remote sites, and publishes nothing about what lives there.
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.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 42 prefixes · 177K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| DE | Germany | 42 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS13043- Registry name
- Bayer-AS
- Registrant
- BAYER-MNT
- Abuse contact
- abuse@bayer.com
- Registered
- 2002-08-19
- Last changed
- 2018-09-06
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 42% valid · 13 valid, 18 with no ROA
- ROAs
- 5 authorising AS13043
- ASPA
- no ASPA record
- IRR
- 100% registered · 31 of 31 announcements
- Route objects
- 36 naming AS13043
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: 431 networks and 1,768 prefixes, as published 2026-10-12. 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