Autonomous system
AS39063 LEITWERT
Unclassified RIPE Educational/Research
Summary
Leitwert
research measurement education business
The AS handle LEITWERT is held by Leitwert GmbH.
What it's used for
- The address space carries infrastructure for network measurement and research, as indicated by registrants including "Leitwert Research" and "Leitwert Tech" under the netname
DE-LEITWERT-20191122. - The AS announces 512 IPv4 addresses across 2 prefixes and 10 IPv6 prefixes, while maintaining 216 observed neighbours. This ratio of limited address space against a high neighbour count indicates a transit or peering-heavy role rather than an access network.
- Traffic from this AS consists of web and API endpoints supporting large-scale global routing system monitoring and internet intelligence services.
Notable
- Registrants for both announced IPv4 prefixes are consistent with the announcer, listing "Leitwert Admin", "Leitwert Tech", "Leitwert GmbH", and "Leitwert Research".
- The address inventory is finely subdivided, with 10 distinct IPv6 /48 prefixes and a single /30, reflecting internal segmentation for a research and measurement infrastructure.
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 8 exchanges in 6 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 80.81.192.183 |
| LINX LON1 | London, United Kingdom | 195.66.226.203 |
| AMS-IX Amsterdam | Amsterdam, Netherlands | 80.249.212.31 |
| Neutral Internet Exchange | Amsterdam, Netherlands | 193.239.118.208 |
| France-IX Paris | Paris, France | 37.49.236.98 |
| MSK-IX Moscow | Moscow, Russia | 195.208.210.35 |
| SwissIX | Zurich, Switzerland | 91.206.52.133 |
| DE-CIX Marseille | Marseille, France | 185.1.47.119 |
Transit providers
27 upstream, 1 downstream and 92 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 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 512 addresses IPv6 10 prefixes
| Country | Name | Prefixes |
|---|---|---|
| DE | Germany | 12 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS39063- Registry name
- LEITWERT
- Registrant
- LEITWERT-MNT
- Abuse contact
- abuse@leitwert.net
- Registered
- 2015-03-10
- Last changed
- 2023-10-02
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- Leitwert
- Network type
- Educational/Research
- Scope
- Global
- Traffic ratio
- Not Disclosed
- Peering policy
- Open
- IRR as-set
AS-LEITWERT- Present at
- 8 exchanges
- Facilities
- 1 facilities
- Website
- https://www.leitwert.net
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 12 with no ROA
- ROAs
- 0 authorising AS39063
- ASPA
- no ASPA record
- IRR
- 100% registered · 12 of 12 announcements
- Route objects
- 12 naming AS39063
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 1,783 prefixes, as published 2026-10-17. 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